SerialPort (RS-232 Serial COM Port) in C# .NET

.NET has a great class called SerialPort (MSDN reference) part of .NET 2.0 and is freely available in C# Express on MSDN. It is easy to use.  Here’s how…

BTW, this article is about communicating through the PC’s Serial COM RS-232 port using Microsoft .NET 2.0 or later by using the System.IO.Ports.SerialPort class. If you’re looking for USB info, see here.

 

Example Application & Sample Code: SerialPort Terminal

Prerequisites: You will need Microsoft .NET 3.5 to run the app.  It is installed as part of the regular Windows Updates (make sure your computer is fully up to date, see Microsoft Updates for more info) or if that doesn’t work for some reason, you can install .NET 3.5 from here.

Button-DownloadCode-Small Button-RunAppNow-Small
SerialPortTerminal.zip via ClickOnce

To start off, here is sample code in a terminal application which you can try out to see how the SerialPort class is used.  This requires Visual Studio 2010 to compile, which can be obtained free via C# Express.  It is just a simple little application with basic support for text or binary (hex) modes to send and receive data.  A nice feature or two is auto-detection of installed COM ports that update at runtime if you plugin or remove USB-to-Serial adapters, also you can change the DTR and RTS levels and monitor the CTS, DSR, and CD lines.

Build Note: You will receive an error that Visual Studio isn’t able to find NoahCode.pfx.  This is expected as it is the click-once certificate for publishing and is NOT NEEDED for normal code use.  Just go to Project Properties > Signing > Click on Create Test Certificate.  that’s it

SerialPort Terminal 01

 

Get Connected
You can obtain USB to Serial adapters and have just about as many ports on your PC as you like. I carry around two adapters with a null modem (wikipedia) between them so I can create a loopback to send & receive through to separate ports on most any computer. I’d recommend doing the same for when writing code for the serial port.

If you’d like to quickly and easily create your own external devices to communicate with the PC, I recommend starting with the Arduino, NetDuino (like an Arduino but programmed in C#), or Parallax BASIC Stamp modules.  All three have many accessories and sensors available (such as LCDs, RF, Sounds, AD & DA, etc).  sparkfun.com is a great place to look. After that you could migrate to an Atmel Microcontroller (recommended) or Microchip PIC.

 

Write Data Out
Here is an example of how easy it is to use the new SerialPort control.  Very simply, here is how you can send a bit of data out the port.

// This is a new namespace in .NET 2.0
// that contains the SerialPort class using System.IO.Ports; private static void SendSampleData() { // Instantiate the communications
// port with some basic settings SerialPort port = new SerialPort(
"COM1", 9600, Parity.None, 8, StopBits.One); // Open the port for communications port.Open(); // Write a string port.Write("Hello World"); // Write a set of bytes port.Write(new byte[] {0x0A, 0xE2, 0xFF}, 0, 3); // Close the port port.Close(); }




Read Data From Port

Now let’s take a look at what it takes to read data in from the communications port. This demonstrates reading text.

  1. Create a new "Console Application" and replace all the default class code with this code
  2. Add a reference to "System.Windows.Forms" to the project
  3. Run w/ F5, to exit the app, press Ctrl-Break.
  4. Get Connected with two USB to Serial adapters and a null modem
  5. Use another app, the code above, or the SerialPortTerminal.zip example to send data and watch it come in with this code

#region Namespace Inclusions using System; using System.IO.Ports; using System.Windows.Forms; #endregion namespace SerialPortExample { class SerialPortProgram { // Create the serial port with basic settings private SerialPort port = new SerialPort("COM1",
9600, Parity.None, 8
, StopBits.One); [STAThread] static void Main(string[] args) { // Instatiate this class new SerialPortProgram(); } private SerialPortProgram() { Console.WriteLine("Incoming Data:"); // Attach a method to be called when there
// is data waiting in the port's buffer port.DataReceived += new
SerialDataReceivedEventHandler(port_DataReceived); // Begin communications port.Open(); // Enter an application loop to keep this thread alive Application.Run(); } private void port_DataReceived(object sender,
SerialDataReceivedEventArgs e) { // Show all the incoming data in the port's buffer Console.WriteLine(port.ReadExisting()); } } }



Listing Available Ports

One of the (several) new methods that is supported, and one I’m very glad is finally here, is the ability to obtain a list of the COM ports installed on the computer (ex: COM1, COM2, COM4). This is definately helpful when you want to present the list of ports avalible for the user to select from (as in the SerialPortTerminal.zip Win App example).

foreach (string s in SerialPort.GetPortNames()) Console.WriteLine(s);



Sending Files

Here are two helpful little methods for sending files through the serial port. Of course, these are the bare essentials and as always, you should check to make sure the port is open first (port.IsOpen) and use try/catch around trying to open a file, but you get the gist with this code. The binary sending routine is limited to about 2GB (the size of an int), but this should be okay for most uses.

using System.IO; private static void SendTextFile(
SerialPort port, string FileName) { port.Write(File.OpenText(FileName).ReadToEnd()); } private static void SendBinaryFile(
SerialPort port, string FileName) { using (FileStream fs = File.OpenRead(FileName)) port.Write((new BinaryReader(fs)).ReadBytes(
(int)fs.Length), 0, (int)fs.Length); }


RS-232 Project Photos

Each of these involve RS-232 serial port communications.

Just what’s needed to get started with microcontrollers,

a Basic Stamp, mini LCD display, power, and RS-232 port.

 

Two USB to Serial adapters with a null modem

to loopback and test your serial software.

 

The brains to a mini automated radio station that let me

control my PC & home using my HAM radio from around town.

 


Port Wiring Notes

DB9 Male (Pin Side)                   DB9 Female (Pin Side)
DB9 Female (Solder Side)              DB9 Male (Solder Side)
    -------------                          -------------
    \ 1 2 3 4 5 /                          \ 5 4 3 2 1 /
     \ 6 7 8 9 /                            \ 9 8 7 6 /
      ---------                              ---------

DB9 Female to DB9 Female Null-Modem Wiring
 2 |  3 |  7 |  8 | 6&1|  5 |  4
---- ---- ---- ---- ---- ---- ---- 
 3 |  2 |  8 |  7 |  4 |  5 | 6&1

9-pin   25-pin  Assignment                 From PC
------  ------  -------------------------  ------------
Shield  1       Case Ground                Gnd
1       8       DCD (Data Carrier Detect)  Input
2       3       RX  (Receive Data)         Input
3       2       TX  (Transmit Data)        Output
4       20      DTR (Data Terminal Ready)  Output
5       7       GND (Signal Ground)        Gnd
6       6       DSR (Data Set Ready)       Input
7       4       RTS (Request To Send)      Output
8       5       CTS (Clear To Send)        Input
9       22      RI  (Ring Indicator)       Input

- RTS & DTR are binary outputs that can be manually set and held
- DCD, DSR, CTS, and RI are binary inputs that can be read
- RX & TX can not be set manually and are controlled by the UART
- maximum voltages are between -15 volts and +15 volts
- binary outputs are between +5 to +15 volts and -5 to -15 volts
- binary inputs are between +3 to +15 volts and -3 to -15 volts
- input voltages between -3 to +3 are undefined while output voltages
  between -5 and +5 are undefined
- positive voltages indicate ON or SPACE, negative voltages indicate
  OFF or MARK



Protocol Development

If you are making your own serial interface/protocol, you really must have a good standard in place. Serial data flows into the com port byte by byte and must be buffered and parsed correctly. Think of it this way, if a terminal sent your computer "Hello World" it may come in as four OnComm triggers: "H", "ello", " Wo", and "rld"

The best protocols are usually a mix of these methods.  Here are three simple protocol techniques:

  1. Beginning and Ending ("Start" & "Stop") Codes

    This is good for sending text as it lets everybody know when text starts and ends. You simply tack on a non-normal byte at the beginning and end of the text. For example, you’d use ‘—‘ to signify the start of the string and ‘===’ to signify the end. So you would use: com.Output = "—Hello World===";

     

  2. Fixed Length Codes

    Used for specific commands. You can create your own codes to send and specify what they mean. Say I want to control the lighting in a house, I’d setup a protocol of commands like this:

    1st byte = House Code, 2nd byte = Light Code, 3rd byte = On or Off (0 for off, 1 for on)

    So to turn on the 11th light in my house (house code #3) I’d use:

    com.Output = new byte[] {3, 11, 0};

  3. Prefixed Data Packet

    This is probably the most common and flexible but requires the most coding. Just prefix your data packet with the length of the data. The prefix must be a fixed size, such as two bytes which would allow a data packet of up to 65,535 bytes. Then the receiver knows how much data is in the packet because it always takes the first two bytes and uses the rest as the data packet.

    Example: com.Output = ((char) 00) + ((char) 11) + "Hello World";


Other Resources

Here are some additional sites, libraries, tutorials, etc. These are links that I just found around the net and am providing for convenience (they are not endorsed).


The Final Say

The new SerialPort class in .NET 2.0+ rocks! It is much easier to use than getting the old MSComm.ocx control going in a .NET app, contains new functionality, is a ‘native’ .NET control, has docs built into the MSDN Library, and is easy to use.

Frequently Asked Questions (FAQ)

I’m adding this section (as of 8/10/06) to address the common questions I get on this post and through e-mail.  Chances are, if you ask a good question in the comments here, I’ll post it here for others to see easily. Some of the most popular topics are usb, device, cable, lines, power, packets, bridge, permissions, help.

  1. Q: When updating a control (like a text box) while in the DataRecieved event, I get an error.

    A: The SerialPort class raises events on a separate thread than the main form was create on.  Windows Forms controls must be modified only on their original thread.  Thankfully there is an easy way to do this.  Each Windows control has a "Invoke" method which will run code on the control’s original thread.  So to put the recently received data into a text box (txtLog), this would do it:   txtLog.Invoke(new EventHandler(delegate { txtLog.Text += comport.ReadExisting(); });   You can see this more in action in the "Log" event of "Terminal.cs" my sample code project, SerialPortTerminal.zip.

     

  2. Q: I can’t find the System.IO.Ports namespace.

    A: Using Visual Studio 2003?  The new namespace, and SerialPort class, is part of .NET 2.0 and Visual Studio 2005.  It is not included in .NET 1.x (and Visual Studio 2003).  Even if you have .NET 2.0 or Visual Studio 2005 installed, you can not access the class from within Visual Studio 2003.

     

  3. Q: I only have .NET 1.1, what can I do?

    A: Upgrade to .NET 2.0.  Seriously, it’s free.  In fact, you can get the great C# and VB Visual Studio Interactive Development Environment (IDE) editors for FREE now with C# Express and VB Express.  The .NET Framework Software Development Kit (SDK) for command-line development is also free.  If you really must stay in .NET 1.1, you can use a 3rd party library.

     

  4. Q: I’m sending data to my device, but it is not responding.

    A: First make sure the device will respond using a standard app like Hyperterminal.  Check the settings (baud rate, data bits, stop bits, etc) and make sure they match with your code.  Try sending binary data via binary arrays.  Many devices expect a carriage return at the end of a command, so be sure to send 0x0D or \n.  String data can be easily converted to a binary array using:

    byte[] data = System.Text.ASCIIEncoding.Default.GetBytes("Hello World\n");

    com.Write(data, 0, data.Length);

    Many devices require several carriage returns first to sync baud rates, so send several, like: com.Output("".PadLeft(9, ‘\n’));  It you’re communicating with a modem, make sure Echo Back is turned on.  Send "ATE1\n".  Other than this, just keep trying and playing around with it.  It can be hard because you don’t see the response from the device as easily as you would with a terminal app.

     

  5. Q: When I put received data to a text box or rich text box, I get a strange symbols.

    A: The default font of text boxes is designed only to show standard characters.  Try using "CharMap" (a free tool in WinXP, click "Start", "Run", type "CharMap", enter).  "Terminal" is a font designed to show classic ASCII characters and is what most terminal apps (like my sample code and Hyperterminal) use.  There are also many ASCII codes that won’t display correctly.  This is why I choose to show the hex data instead of an ASCII string a lot of the time.  System.Convert.ToString(mybyte, 16) will convert a byte to a string hex code, for example: byte b = 13; string s = Convert.ToStrong(b, 16).PadLeft(2, ‘0’), then s will contain "0D".  See the "ByteArrayToHexString" and "HexStringToByteArray" methods in my sample app, SerialPortTerminal.zip.

     

  6. Q: What about USB communications?  How can I do USB?

    This blog post isn’t about USB.  Believe me, I wish the .NET framework supported USB natively, and I’m doing what I can here at Microsoft to see USB get into the framework in the future.  For now, you can use a USB to Serial adapter.  I use a lot of these.  They plug into the USB port, then appear just as a SerialPort to the PC. 

    For native USB devices, microcontroller vendors such as Microchip, Atmel, and TI make chips that do this for projects as well as have chips that support USB natively (I’m using the PIC18F14K50).  There is a lot of info and USB C# libraries readily available online with a quick search, try USB C#, which turns up resources like this great article or this USB HID C# open source project

    For simple USB-to-Serial bridges that allow your device to communicate via RS-232 but connect via USB to the PC, check out the section below on USB-to-Serial Bridge Chipsets

     

  7. Q: Can I use the sample code here in my own projects (commercial or not)?

    Yes!  All sample code on my blog is free public domain material.  I’m not a legal guy so I don’t know the exact words to use, but I’ll try…  I’m not responsible for any problems!  Use at your own rick etc.  However, have at it, if it helps you out, fantastic, that’s what it’s here for.

     

  8. Q: When using SerialPort.Open() (or SerialPort.PortOpen = true) I get the exception "UnauthorizedAccessException" or the error "An unhandled exception of type ‘System.Runtime.InteropServices.COMException’ occurred in axinterop.mscommlib.dll"

    It may be one of a few factors:

    • It may require Administrative privileges to use the port.
    • The port may already be open by another program, only one app can use a port at a time.
    • The port may not exist on the computer (this happens a lot).  Verify the port you’re trying to open is listed in the Device Manager (FAQ #9).
    • The name being provided is not exactly correct.

      Use the full name of the port when opening, like "COM1" (not "1")

       

  9. Q: How do I know what COM ports are on my PC?

    Use the Device Manager ("Start", "Run", "devmgmt.msc") and look for the "Ports" node (see below).  If you don’t see a Ports node, it’s because there are no Serial or Parallel ports installed in the PC.  You can also use System.IO.Ports.SerialPort.GetPortNames() to return the list of available ports.  Many laptops these day’s don’t have a serial port.  You can get more serial ports very easily today with USB to Serial adapters.

     

  10. Q: How do I communicate with my specific device?  Modem, Mobile Phone, LED/LCD Display, Scanner, GPS, GSM/GPRS, CDMA, test equipment, etc

    This post is specific to device independent serial port communications.  RS-232 is a hardware standard and there are hundreds (if not thousands) of software protocols that are created for communicating over RS-232.  An analogy would be that physical telephone hardware is used around the globe (like the RS-232 hardware standard), but there are hundreds of languages people can speak through the phone to each other to communicate (the software protocol).  You will need to find information about the protocol used for your specific device elsewhere.  I’d recommend looking on the manufacture’s website, writing/calling the manufacture, or searching online for your specific device.  Sometimes you can find fans or hackers of a device that congregate on a forum.  Some protocols can be found through wikipedia, like the GPS NMEA 0183 serial protocol that GPS units use to send their data via a serial connection.  Honestly the RS-232 communications is the easy part, I personally find the more interesting challenge is writing software for the particular protocol in use.  Best of luck in finding specifications on the protocol you’re device uses!

     

  11. Q: What control lines can I manually manipulate?

    Control lines on an RS-232 serial port were introduced to provide flow control of serial data.  Even though a modem or PC may be rated for a particular baud rate, it doesn’t always mean that the device can process the data that fast.  For example, bits may flow in through a modem at 2400 bps (bits per second) but in the early days a PC couldn’t process the data fast enough, so it would toggle control lines to tell the modem that it was read for more data or to ‘pause’ send it data.  Now since PCs are quite fast these lines are mostly ignored.  They can be used as a simple way to toggle an LED or send or receive high or low states. RTS/CTS control flow is one such technique which is supported natively by the control via the Handshake property.

    Lines marked ‘Output’ in the table can be set by the serial port to a high or low state (True or False) and the ‘Input’ lines can be read as high or low.  You can use the PinChanged event to be notified when one of the input pins changes.  The Handshake property can be set to use RTS/CTS (uses hardware control lines) or XON/XOFF (uses software) or both.

    Control Line Name DB9 Pin SerialPort Property I/O
    DTR Data Terminal Ready 4 DtrEnable Output
    RTS Request to Send 7 RtsEnable Output
    CTS Clear to Send 8 CtsHolding Input
    DSR Data Set Ready 6 DsrHolding Input
    CD (or DCD) Data Carrier Detect 1 CDHolding Input

    For detecting a Ring Indication, see the next question.

     

  12. Q: How do you detect the Ring Indicator line?

    There isn’t a property off of the SerialPort class to test the current state of the Ring Indicator (DB9 pin 9), but there is an event that gets triggered, PinChanged.   You can attach an event listener to PinChanged and when the event is called, SerialPinChangedEventArgs is passed with a EventType property of type SerialPinChange which will indicate if a ring indication was detected.  Here is an example:

    comport.PinChanged += new SerialPinChangedEventHandler(comport_PinChanged);

     

    void comport_PinChanged(object sender, SerialPinChangedEventArgs e)

    {

      if (e.EventType == SerialPinChange.Ring) RingDetected();

    }

     

  13. Q: What pins can I use for powering devices, a high signal, or for boolean input & output?

    The TX & RX pins carry the standard serial signal, but the other pins can be used as high/low input/output pins.  The output pins (4 DTR or 8 CTS), supply 5 to 15 volts (15v is proper RS-232 standard, 5v is what you’ll usually get) when high and low is 0 to -15 volts.  They only supply flea current (very little current) so they’re not meant to be used for powering any devices (like USB is designed for).  However, they can be used as a reference voltage or for switching to one of the input pins for a high or low signal.  The input pins (1 DCD, 6 DSR, 8 CTS, and 9 RI) can be used to detect a high or low signal.  Proper RS-232 signal levels are -15v for a low and +15v for a high (compared to ground, pin 5).  A MAX232 or similar chip takes a TTL 0-5v input and produces the -15v to +15v levels.  However, most PC RS-232 COM ports will accept a 0v for low and 5v for high, but it is not guaranteed and alters from PC to PC.  If you want a simple "toggle high", just hold pin 4 DTR high, and switch it to pin 1 DCD.  The .NET SerialPort class has easy to use properties for switching the output pins high or low and for detecting the current level of the input pins.  I have been able to use pin 4 DTR for a very low current (20ma max) PIC processors, but not reliably.  I prefer to always supply external power and use pin 4 as a signal to turn on or off my device.  I’ll attach pin 4 to a transistor that switches my power source to my PIC to turn it on or off.

     

  14. Q: What about ‘packets’?  Does RS-232 support any commands or data segregation?  OR  Data comes in at seemingly random times?

    Serial data flow through RS-232 has nothing to do with ‘packets’.  It’s just a stream of bytes in and out.  There is no guarantee that data arrives together.

    Packet Protocols

    Any notion of data compartmentalization (packets) would have to be coded by you for your unique use.  Much of my time working with serial has been spent on defining useful packet like protocols, that usually include some type of header, command structure, and CRC check.  For example, the first two bytes are the packet length, the next two bytes is the command, next two bytes are parameters, and the last byte is a CRC.  Then my apps would buffer incoming data and look in the buffer for valid packets.  Of course it differs depending on the device you’re working with and your specific needs.  USB does have specific communications protocol defined, one of them being command based, like the little packet just mentioned.  But with USB, you’re able to get the whole command and parameter together at once, with serial you have to create the protocol yourself, buffer, and parse the data.

    Buffering Incoming Data

    Since bytes may come in at any time, buffering incoming data is critical.  For example, you may send a command out to your device, and the response back to the PC could trigger a single DataReceived event with all the 30 bytes of response data in the receive buffer.  Or more likely, it could be any number of separate triggers of the DataReceived (up to the number of bytes received), like 4 triggers, first with 2 bytes, then 15 bytes, then 1 byte, then 12 bytes.  Don’t look for a complete response in a single DataReceived call, instead:

    1. buffer the incoming data

    2. then scan your buffer to find complete data

    3. remove the used data from the buffer

    To buffer incoming data, use a coding pattern like this:

    (download the code SerialComBuffering.zip)

    using System;

    using System.IO.Ports;

    using System.Collections.Generic;

     

    namespace SerialComBuffering

    {

      class Program

      {

        SerialPort com = new SerialPort(SerialPort.GetPortNames()[0],

          9600, Parity.None, 8, StopBits.One);

        List<byte> bBuffer = new List<byte>();

        string sBuffer = String.Empty;

     

        static void Main(string[] args)

        { new Program(); }

     

        Program()

        {

          com.DataReceived +=

            new SerialDataReceivedEventHandler(com_DataReceived);

          com.Open();

     

          Console.WriteLine("Waiting for incoming data…");

          Console.ReadKey();

        }

     

        void com_DataReceived(object sender,

          SerialDataReceivedEventArgs e)

        {

          // Use either the binary OR the string technique (but not both)

     

          // Buffer and process binary data

          while (com.BytesToRead > 0)

            bBuffer.Add((byte)com.ReadByte());

          ProcessBuffer(bBuffer);

     

          // Buffer string data

          sBuffer += com.ReadExisting();

          ProcessBuffer(sBuffer);

        }

     

        private void ProcessBuffer(string sBuffer)

        {

          // Look in the string for useful information

          // then remove the useful data from the buffer

        }

     

        private void ProcessBuffer(List<byte> bBuffer)

        {

          // Look in the byte array for useful information

          // then remove the useful data from the buffer

        }

      }

    }

                                                   
     

  15. Q: How do you detect when a device is connected or disconnected?

    Simply put, the device usually starts or stops sending data.  There are no built in events when a device connects or disconnects.  But there are a few tricks you can do, if you’re creating the serial device yourself, then you have more options.  I’ve had my devices (and PC apps) send a constant “are you there” set of bytes, like 00 00 11 11 00 00 hex (I’d use a ‘are you there’ custom ‘packet’ as in Q13 above) till a device on the other end responds.  You could also use hardware, that’s what some of the other signals lines are for (CDC, DSR, RTS, CTS, RI), you can tie one of these high and then catch an event when the line goes high so you know there’s a device there, when it goes low the device is gone.

     

  16. Q: How do I transfer files?

    If you’re interested in sending entire files between computers or to a device, you have two primary choices.  First choice is to write your own protocol for breaking a file into manageable packets, detecting errors, sending/receiving, etc.  Second choice is to use a protocol already created, like XModem, YModem, ZModem, etc.  These protocols were created long ago specifically to send files over a serial connection with features like error correction, being able to resume transfers, compression, etc.  I’m only aware of commercial implementations for .NET right now, like Sax Software’s CommStudio.  If anyone find an open source implementation, please let me know!

     

  17. Q: Where can I get USB-to-Serial cables?

    41PqGXytfvL._AA300_[1]USB-to-Serial adapter cables allow you to get a standard RS-232 DB9 cable by plugging in the adapter to your USB port.  You can use several of these to get multiple DB9 ports.  Many laptops, even desktops, don’t have serial ports these days which makes these particularly handy.

     
    Every so often I source a good cable for a decent price, typically around $12.  Here is the deal I’m currently using.  http://amzn.to/JnZ7ag

     
    Be forewarned, not all cables are created equally!  There are two issues to contend with…

    1. There are a number of companies that create USB chipsets that emulates an RS-232 port.  Some are much more compatible with PCs and Macs than others.  For example, the Prolific and FTDI chipset are used in the most compatible adapters (unlike Ark Micro, or others).  Those companies produce WHQL (Windows Hardware Quality Labs) certified drivers and the drivers are built into most Windows and Mac systems already.  So when shopping for a cable, be sure to check the chipset manufacture.  Here are some handy links to drivers in case you need them.
      1. Prolific Chipset Drivers
      2. FTDI Chipset Drivers
    2. Standard RS-232 signals range from 3 to 15 volts (plus or minus), 0 is not a valid signal.  The USB-to-Serial interface chips used in these cables produce 0 to 5 volts, standard TTL level logic.  While this works for some PCs, and certainly most microcontrollers, it is not 100% compatible.  The ‘correct’ USB-to-Serial cables incorporate an additional line level driver, like the MAX232, that take the 0 to 5 volts and convert it to an appropriate +/- 12 volts for RS-232.  The problem is that many low-quality cables exist out there without this line level driver chip.

       
  18. Q: How can I best interface with my microcontroller?  USB-to-Serial Bridge Chipsets

    FTDI FT232R 01 If you are building your own devices, usually with some type of microcontroller, and want to interface with the PC, you can certainly use RS-232 either plugged straight into your PC or via a USB-to-Serial adapter cable, but another option is to use an USB-to-Serial bridge chipset directly in your project (what is inside of the USB-to-Serial adapter cables).  This allows your device to use RS-232 internally, but connect to a computer via USB and you as a project designer never need worry about the USB interface or drivers (your device and PC software just see serial RS-232).  You could use a native USB microcontroller (without an RS-232 bridge), such as the PIC18F14K50, but that requires writing your own USB drivers and a much deeper understanding of the USB infrastructure (both in hardware and software).  That particular PIC also comes with a Serial emulator and drivers like below.  This article is focused on serial RS-232, so I’m covering the USB-to-Serial bridges here.

     
    These modern ICs don’t require external crystals, can power your device from USB Power, provide clock sources for your micro if you like, and come with Windows Certified (WHQL) drivers that are actually included in Windows Vista and beyond (also built in Mac drivers).  Here are a few…

    1. FTDI FT232RL

      The FTDI chips are most popular in electronics projects and used by companies like Parallax and the Arduino Duemilanove.  They also have the best support in terms of evaluation modules, well written datasheet, and product availability. product info, evaluation modules, buy from Mouser, drivers

       

    2. Prolific PL-2303HX

      These are the chips used in the most popular USB-to-Serial cables.  They are slightly less costly than the FTDI chips in bulk, but are not quite as well supported in the US market.  product info 
       
    3. TI TUSB3410

      Another option from Texas Instruments.  I haven’t used this chip.  Product Info

       

    p.s. For trying it out and prototyping, I personally recommend this particular FTDI evaluation board, the UM232R since it plugs into typical solderless protoytpe breadboards and has most of the pins easily accessible.  Last priced it was $20 from Mouser.

    FTDI FT232R 02 UM232R

     

  19. Q: How do I automatically detect the baud rate of a device?

    The PC doesn’t have built-in automatic baud detection, but there is an easy trick to implement basic baud detection for many devices.  If there is a known call & response to the device you can set the baud rate of the port to one setting, open the port, send the call, see if you get the expected response, and if not close the port, set a different baud rate, and repeat.  For my own devices I’ve had some of them send a known character string (could be anything, like 000ABCD) after they receive a high on the DTR line.  This way my serial code can set DTR high, see if it gets the ABCD at one baud rate and if not, close the port, set another baud rate, open the port, turn DTR high, and try again.  If the baud rates match the characters will be read correctly, if not then the characters will be jumbled.  This can be done with many other devices as well if there’s a known call and response, like sending a modem an AT command with an expected response code.

     

  20. Q: May I have permissions to use your code?

    Yes!  The code and samples here are released under the MIT License
     

  21. Q: How can I get more support?  What are my support options?

548 thoughts on “SerialPort (RS-232 Serial COM Port) in C# .NET

  1. >I cant find the name space

    Check this phrase near the start of this posting:

    "the new SerialPort control that is part of .NET 2.0 (currently in Beta)"

  2. Hi,

    I really thank you for being the only mangaed .Net source of seial comm.:)

    I have .Net 2.0 Beta installed. And can compile your hello world! example. But when it tries to Open the port. Exception says there is no COM1 port.

    Any Comments !

  3. if I set the port.ReceivedBytesThreshold to 5 would the following event

    port.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);

    be called after there is 5 bytes in the buffer…

    Also can you show how to use port.Read(buff,0,5) where buff is defined as

    byte buff = new byte[5];

    I am calling the port.Read function after the event is called 5 times to make sure there are 5 bytes in the buffer but still it doesn’t work.

  4. The method’s parameters are port.Read(byte[], int, int), so the first parameter is a byte array (byte[]). Try: byte[] buf = new byte[5];

    But I don’t recommend reading a fixed # of bytes if possible since it is very easy to get one or two bytes off in the incoming buffer and hence not receive the data when expected or get unexpected results.

    This is much preferred since it handles any amount of incoming data. Just process what ends up in the PortBuffer and remember to clean it out from time to time to prevent memory creep.

    private List<byte> PortBuffer = new List<byte>();

    private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)

    {

    SerialPort port = (SerialPort)sender;

    byte[] data = new byte[port.BytesToRead];

    port.Read(data, 0, data.Length);

    PortBuffer.AddRange(data);

    ProcessIncomingData(PortBuffer);

    }

    private void ProcessIncomingData(List<byte> PortBuffer)

    {

    // Search through the bytes to find the data you want

    // then remove the data from the list. It is good to

    // clean up unused bytes (usually everything before

    // what you’re looking for)

    }

  5. Thanks for your help man….

    One question…. I have data coming through bus in sets of 5 bytes at a time at very high speeds…about 1.5ms delay. Is there anyway I can force the program to call SerialDataReceivedEventHandler after it gets 5 bytes of data…. by setting port.ReceivedBytesThreshold to 5 do it????

  6. I’d suppose so, have you tried it? I use the technique above so I’ve never tried triggering the event on x # of bytes. The purpose of changing the ReceivedBytesThreshold is not to capture little ‘packets’ like that, but to reduce the # of times the method is called if large amounts of data are streaming in.

  7. I guess any client applications will need to upgrade to .net2.0 ? I am skeptical about this as .net is still in .net.

    Can any one share any experience about this.

    Seshagiri

  8. What I was thinking was would client applications need to install .net 2.0 if I used the new feature in my application. If it is so, in that case is it recommendable as .net 2.0 is still in beta stage and there could be compatibility issues with the final release.

    Seshagiri

  9. Seshagiri: Yes, clients must be running .NET 2.0. The deployment version from Beta2 will be different than that for RTM. VS05 Beta2 is not for public release yet, that’s for when the product is finalized and released to market the second week of November. In the mean time, it is for testing and deployment to select targets (w/ a Go Live licence, see MSDN).

  10. Hi Noah!

    I’m trying to send a simple "ati4" command to a modem and receive its response, but all I get back is whatever ati command I send.

    If I Send: ati4

    I Expect To Get Back:

    USRobotics Sportster 28800 V.34 Fax Settings…

    B0 E1 F1 M1 Q0 V1 X4 Y0

    BAUD=38400 PARITY=N WORDLEN=8

    DIAL=PULSE ON HOOK, etc..

    But Instead I Get Back: ati4

    I’ve tried both my own test application as well as the one you created. Any ideas? Thanks so much!

  11. Update

    ——

    Hi Noah!

    After further debugging, I observe that the port_DataReceived function in your SerialPort Terminal example is never being called. I see the function being added as an EventHandler earlier:

    comport.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);

    I can’t figure for the life of me why it’s never reaching the function though. All I know is this is why, for example, I only receive an echo of my "at" command and not the actual "ok" response I’m expecting. I didnt change any of the code, so why would this be happening?

    Cheers!

  12. This is a reply to ‘Nathan Ie’ question about the ATI4 question.

    I had the same problem and found out, that if you use WriteLine() method to write the "ATI4" string it will echo the sting back.

    You have to use the Write() method and specify the file feed "\r". If you call method Write("ATI4\r") you will get the expected result. You can also change the SerialPort.NewLine Property from "\r\n" to "\r" to make it work.

    Hope that helped

  13. when i do "port.Open()", it says

    UnauthorizedAccessException was unhandled.

    Access to the port "COM1" is denied.

    Make sure you have sufficient privileges to access this resource

    I just put your code segment into a button1_Click handler. What should I do to make it work?

  14. Actually nevermind my previous post, i solved the problem. But i have a new question 🙂

    How can I manually send bit signals to RTS & DTR?

    I need to send something like "0110000011010000" to RTS and at the same time (synchronized) send its logic inverses to DTR.

    I am a student from university of toronto and very new to serial programming. please help me!!

  15. I run your program on my desktop (Windows XP Professional with SP2 and Visual Studio.NET 2005 Beta 2), the port can’t be opened. The IDE said that "Access to the port ‘COM1’ is denied." It is UnauthorizedAccessException. Please tell me how to solve the problem? Thank you very much!

  16. The port may not exist on your computer or may be in use by another application (like for a modem). Change "COM1" in the code to another port, like "COM2" and try that. You can also check to see what ports are avalible on your machine through the Device Manager (press Windows-Break, "Hardware" tab, "Device Manager" button, "Ports (COM & LPT)" node).

  17. You are right. I install ActiveSyn 4.0 which uses COM1. After I delete it, the program works very well. I have another question. I modify you program in DataReceive event handler:

    void serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)

    {

    int intBytes = serialPort.BytesToRead;

    byte[] bytes = new byte[intBytes];

    serialPort.Read(bytes, 0, intBytes);

    tbReceive.Text += intBytes.ToString() + ";";

    }

    The tbReceive is a TextBox control. When the program excutes at the last line,

    tbReceive.Text += intBytes.ToString() + ";";

    there is an exception, System.InvalidOperationException was unhandled. The error message is "Cross-thread operation not valid: Control ‘tbReceive’ accessed from a thread other than the thread it was created on." Please tell me what’s reason and how to solve it. Thanks!

  18. Hi Charlie!

    int intBytes;

    void serialPort_DataReceived(object sender, SerialDataReceivedEventArgs e)

    {

    intBytes = serialPort.BytesToRead;

    byte[] bytes = new byte[intBytes];

    serialPort.Read(bytes, 0, intBytes);

    this.Invoke(new EventHandler(SetText));

    }

    void SetText()

    {

    tbReceive.Text += intBytes.ToString() + ";";

    }

  19. Hi Noah,

    I read your article on System.IO.Ports.SerialPort class of new

    C# Express. I tried to achieve a basic communication between my pc and the lab instrument with the following code:

    After the usual port initialization,

    if (com.IsOpen) com.Close();

    com.Open();

    // send char 34,14,192,51,0,0

    com.Write(new string(new char[] { (char)34, (char)14, (char)192, (char)51, (char)0, (char)0 }, 0, 6));

    // for testing purposes I connected TX and RX pins of the port…

    // receive routine:

    private void com_DataReceived(object sender, SerialDataReceivedEventArgs e)

    {

    // This method will be called when there is data waiting in the port’s buffer

    // Obtain the number of bytes waiting in the port’s buffer

    bytes = com.BytesToRead;

    // Create a byte array buffer to hold the incoming data

    buffer = new char[bytes];

    // Read the data from the port and store it in our buffer

    com.Read(buffer, 0, bytes);

    }

    After I activate the send routine, 6 bytes of data is received by pc but with some difference to the originally sent data.

    I receive : 34,14,63,51,0,0 everytime instead of 34,14,192,51,0,0

    I tried to transmit 34,14,127,51,0,0 and received the same data sequence…

    As I try to tranmit anything bigger than 127 I receive 63 instead of the original data…

    Do you have any idea why this is happening consistently?

    Regards,

    Haluk Gokmen

  20. Green,

    Thanks for the update to charlie’s post. The reason for this is that WinForms controls’ properties must be modified on the same thread that they were created on. By using this.Invoke (where "this" is the form the control is on), it asks the form to run another method on the same thread the form is on. serialPort_DataReceived could be triggered at anytime (not just when the form is avalible) since the SerialPort control runs outside of the form’s thread. This is a big advantage in that it will always be responsive to incoming serial data even if the form is busy with an intensive redraw or update.

  21. Dear Noah,

    I tried byte array on the receiving side without a difference on the result.

    I was succeding on a similar operation in VS.NET by utilizing MSComm OCX as suggested in your article at http://www.devhood.com/tutorials/ tutorial_details.aspx?tutorial_id=320

    The following is the code:

    private byte[] recdata = new byte[40]; //received data array

    public void InitComPort()

    {

    // Set the com port to be 1

    com.CommPort = 1;

    // This port is already open, close it to reset it.

    if (com.PortOpen) com.PortOpen = false;

    // Trigger the OnComm event whenever data is received

    // Loop based receieve activated…

    com.RThreshold = 0;

    // Set the port to 9600 baud, no parity bit, 8 data bits, 1 stop bit (all standard)

    com.Settings = "9600,n,8,1";

    // Force the DTR line high, used sometimes to hang up modems

    com.DTREnable = true;

    // No handshaking is used

    com.Handshaking = MSCommLib.HandshakeConstants.comNone;

    // Don’t mess with byte arrays, only works with simple data (characters A-Z and numbers)

    com.InputMode = MSCommLib.InputModeConstants.comInputModeBinary;

    // Use this line instead for byte array input, best for most communications

    //com.InputMode = MSCommLib.InputModeConstants.comInputModeText;

    // Read the entire waiting data when com.Input is used

    com.InputLen = 0;

    // Don’t discard nulls, 0x00 is a useful byte

    com.NullDiscard = false;

    // Open the com port

    com.PortOpen = true;

    }

    private void cmdRead_Start_Click(object sender, System.EventArgs e)

    {

    long TimeStamp = DateTime.Now.Ticks; // Time Stamp for Time-out

    bool ElapsedTime;

    com.Output = new string(new char[]{(char) 34, (char) 14, (char) 192, (char) 51, (char) 0, (char) 0});

    // collect data during the first one second period…

    do

    {

    // Dont lock up the entire application

    // release control to process other messages.

    System.Windows.Forms.Application.DoEvents();

    // If there is data waiting, buffer it in our own byte array…

    if (com.InBufferCount >= 34) recdata = (byte[])com.Input;

    // Look for the Elapsed Time

    ElapsedTime = DateTime.Now.Ticks – TimeStamp > TimeSpan.TicksPerSecond * 1;

    // Keep waiting for 1 second before processing incoming data stream…

    }

    while (!ElapsedTime);

    Global.samplescounter = recdata[27] * 100 + recdata[26];

    lblRead_RecordNo.Text = Global.samplescounter.ToString();

    .

    .

    .

    }

    My instrumentation which is target to this communication action is responding to data sent in char format. It doesnt respond to byte arrays.

    This previous code is still working but I cant get the new one working.

    Regards..

  22. Briefly, I would like to transmit Unicode 192 (u\192) from the serial port and read it back again. How can I do this in C# 2005 Express?

  23. You’re right.. it’s much easier!

    but i have a little problem

    I get this from the serial port:

    U001W1 N 1,852 kg

    U001W1 N 1,852 kg

    U001W1 N 1,852 kg

    U001W1 N 1,852 kg

    U001W1 N 1,852 kg

    How can i fix it, that i just geht the "1,852" from it?

    thanxx

  24. Hello Noah and every visitor. Thanks for the great introduction to the SerialPort.

    I have written a simple code, and to test i have used a cross over cable from COM1 to COM2. If I run 2 instances of the code on the 2 ports it works (send and receive) perfectly. But if I use Hyper Terminal on one end (say for example Hyper terminal on COM2 and my code on COM1) my code can send and hyper terminal receives it but if hyper terminal sends my code do not see anything. The same thing happended when i used your sample code. But of course when i test two instances of hyper terminal can eailty talk to each other.

    What am I missing here?

  25. Great intro maan.

    I tried reading from COM1 using VB.NET (2005 beta 2). I am not able to get the DataReceived event to get triggered. The data from a connected scale transmits whenever its weight is stable.

    I coded this in a form. Does it have to be a console application instead ?

    I am using ReadExisting(). Do you need to use ReadByte() ? If yes, does that code need to be in a thread to avoid sync/no-timeout ?

    Thanks for any advice.

  26. I have written a program that sends commands to and receives the responses from a serial device. This work normaly. However the device is also outputing data every .x seconds. I am having a very difficult time receiving this data and getting it onto my form. Your suggestions and advice are greatly appreciated.

    Private Sub Write_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Write.Click

    Dim gxTXDBuffer As String

    Dim sInput As String

    Dim lTimeout As Long

    Dim Time As Long

    ‘clear input buffer counter

    AxMSComm1.InBufferCount = 0

    ‘setup command to send

    gxTXDBuffer = sendtext.Text & Chr(10)

    ‘send command

    AxMSComm1.Output = gxTXDBuffer

    ‘———————————————————————–

    ‘not sure how to get data when counting



    ‘While sendtext.Text = "C"

    ‘ Microsoft.VisualBasic.Timer > lTimeout



    ‘read in response

    ‘sInput = AxMSComm1.Input

    ‘ receivetext.Text = sInput

    ‘ End While

    ‘———————————————————–

    ‘wait for response or timeout

    lTimeout = Microsoft.VisualBasic.Timer + 5

    Do

    Application.DoEvents()

    Loop Until AxMSComm1.InBufferCount >= 8 Or Microsoft.VisualBasic.Timer > lTimeout



    ‘read in response

    sInput = AxMSComm1.Input

    receivetext.Text = sInput

    End Sub

    ‘another attempt at reading counts when com event



    ‘ Private Sub AxMSComm1_OnComm()

    ‘ Dim sInput As String

    ‘ commevent 2 = Received RThreshold number of characters. This event is generated continuously

    ‘ until you use the Input property to remove the data from the receive buffer.

    ‘ If AxMSComm1.CommEvent() = 2 And AxMSComm1.InBufferCount > 0 Then

    ‘ sInput = AxMSComm1.Input

    ‘ ‘ receivetext.Text = sInput

    ‘ End If

    ” End Sub

  27. I am using VS.Net 2003, Actually i ve to do hardware interface in which i need to recieve data and plot it as graph and save it in database. Can anyone help me out…

    Thanks

  28. Hi All,

    I have the following problem:

    After sending a Write command to a device, directly followed by a Read command it seems that the data on the device is not yet available.

    It seems that the write/read part is too fast for the device to ‘generate’ the data.

    The baudrate is 9600 and cannot be higher. Also i would not like to add a pause.

    Does anyone have a solution here ?

    Thanx,

    Jan

  29. What about the Timer in windows forms, for data arriving at any time and various durations?

    does firing an event during reading current event would cause problems?

    thanks for your efforts

    thanks,

    elwolv

  30. Hi All,

    Noha – a great article!

    For some reason I’m not reaching the ‘port_DataReceived’ function. Any ideas why?

    I’m running the ‘SerialPortTerminal’ application on my computer with the ‘Portmon’ application monitoring all data at the serial port so nothing is physically connected to the COM. May this be the reason?

    Thanks for your help.

    Elad

  31. Hi there,

    Your article is awesome and the information is so great and very useful.

    However, I have a problem when I tried to write a software to communicate to bluetooth ports(COM4 and COM7) in PDA. The .NET 2.0 does not provide a platform for mobile device.

    Suggestions please.

    Thanks a lot,

    Ikkyusan 😉

  32. This is an awesome and extremely useful article! My one suggestion is that you add some minor clarifications on the DtrEnable property. I’m connecting to an Ultra 5 Sun box and was having a lot of troubles with my commands just getting echoed back to me. Setting the DtrEnable = true solved that problem. My understanding is that it tells the serial port that you’re talking from one data transmitter to another data transmitter.

  33. Im trying to contact my sony wavehawk scanner with.

    port = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);

    port.Encoding = System.Text.Encoding.Default;

    port.NewLine = "\r";

    port.ReceivedBytesThreshold = 1;

    port.DtrEnable = true;

    It reacts, but I dont get the "ok." that I’m expecting… Any ideas?

    I use Serial monitor so that I see what goes in and out.

    //J

  34. I am try to get exactly Method that line the Hexa Method using for sending data throught RS232, that I want is the function fo sendding binary. How can I slove this problem, thank for helping!

  35. The .NET 2.0 class library does not seem to support devices powered by the serial port.

    I have a couple different magstripe readers here at work which will work correctly after making a connection with HyperTerminal or opening the port in a similar .NET 1.1 library, but the device will not function after SerialPort.Open() on .NET 2.0, whether I write a driver program from scratch or try something like Noah’s Serial Terminal. No exception is thrown and SerialPort.PortOpen return True so I know at least, the class library thinks it is funnctional. The light on the device, however, is off, so I know it’s not getting power.

    Does anyone have a serial port powered device working?

  36. Great tutorial. I really want to read data from the com port using managed c++ rather than C#. Can’t find a sample anywhere, Heeellllp!!!

  37. I am trying to open a connection to COM3 on my machine. I have a USB device attached to the computer and its drivers emulate a serial port on COM3.

    SerialPort.GetPortNames() returns "COM1" and "COM3" and if i connect to the port using TeraTerm its fully functional and i can see the data.

    When i invoke open on the port after having set the port name to "COM3" i get an argument exception that the name doesn’t start with COM or that there is no such port. The name DOES start with COM and as i said, GetPortNames() includes COM3.

    Anyone experienced this? Solutions?

    I am using VS 2005 Final on Win XP SP2.

    /// Isak

  38. Ive written a Serial Port monitoring app that reads data from the COM port real time and displays it to a Rich Text Box (along with any special characters such as Carridge Returns, Line Feeds etc). This program works perfectly on Windows XP however when I transfer it to my Server running Windows Server 2003 Standard Edition, it doesnt work. I have installed the NET.Framework 2 on the Server.

    Further troubleshooting I redesigned the program to write a line of text to a text file when the method is called for Data waiting at the Serial Port Buffer. That line of code is :-

    port.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);

    So it appears to me that the method is never being called. The text file also logs when the Serial port is opened and close and when any exceptions are thrown.

    I know the device attached to the serial port is working as I fire up a 3rd Party Serial Port Monitor &/or Hyperterminal and I see the data continuously coming through.

    Can anyone offer any assistance with this problem?

    Thanks,
    Daniel.

  39. Those who are using Serial to USB convertor, Please check article “USB-to-RS232 Hurdle Race” published in elektor electronics Sept. 2005.

    It describe behind the scene effect and it’s reason.

  40. Hi guys,

    Many terminal programs that are available (Hyperterminal being one of them) do not implement handshaking correctly.

    A normal 232 connection will most likely require DTR enabled as well as RTS as well.

    For you apps try setting your serialport with

    port.Handshake = System.IO.Ports.Handshake.RequestToSend;

    This is what most terminal programs call hardware flow control. It will enable RTS/CTS flow control which most devices rely on for transmission timing.

    You may have played with the handshaking in HyperTerminal but if you use a 232 hardware analyser you will notice that it does not change any lines on your port. Changing these setting with a .net v2 app certainly will

    Setting DTR to enabled and handshaking to hardware should power the pin that manufacturers use for power robbing as well.

    Hope that made sense and is of some use

    Ashley

  41. Hi, I am using Visual Studio .NET 2005 which has serial port class built with it.
    I am developing a Web Application in which i require to do serial communication. and i just wanted to know how exactly to include the SerialDataReceivedEventHandler Event in my web application, please help me out.

    Thanks in advance
    gan esh

  42. Thanks for the article Noah! I’ve run the sample as it is and have been unable to get a response from the Wavecom GSM Modem that I am trying to talk to – the port_DataReceived() event is never fired.

    This is driving me nuts! Any ideas? I’m running this on a Windows 2003 Server using VC# Express 2005.

    Regards,
    Mark.

  43. I have connected my PC to a BS2 sitting on a Board of Education(using an USB to Serial adapter). When i write something to the BS2, it gets there, but it also ends up in the input buffer. Why does this happen, and how can i prevent it from happening?

  44. Using your code:
    ———————————————–
    private List PortBuffer = new List();

    private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
    SerialPort port = (SerialPort)sender;

    byte[] data = new byte[port.BytesToRead];

    port.Read(data, 0, data.Length);

    PortBuffer.AddRange(data);

    ProcessIncomingData(PortBuffer);
    }

    private void ProcessIncomingData(List PortBuffer)
    {
    // Search through the bytes to find the data you want
    // then remove the data from the list. It is good to
    // clean up unused bytes (usually everything before
    // what you’re looking for)
    }
    ————————————————-
    I need to find a two byte sequence (E0 80) in the data. I can find one byte or the other with something like this:
    ———————————————-
    int found = PortBuffer.FindIndex(delegate(byte i)
    {return i==0xE0;}
    );

    Console.WriteLine(found);
    ———————————————-
    But how can I find the index of a exact sequence? Thanks.

  45. The SerialPort Terminal worked fine for me…that is if I was communicating with another SerialPort Terminal app.
    When I tried to communicate with HyperTerminal I had to change the handshaking.

    After:
    comport.PortName = cmbPortName.Text;

    Add:
    comport.Handshake = Handshake.RequestToSend;

    Or:
    comport.Handshake = Handshake.RequestToSendXOnXOff;

    I used SysInternals’ Portmon to compare how HyperTerminal connects to the COM port vs. the .Net 2.0 SerialPort class and noticed quite a few differences that I cannot control via the SerialPort class such as:

    IOCTL_SERIAL_SET_HANDFLOW has a different XonLimit and XoffLimit (1024 instead of 80 and 1024 instead of 200, respectively)

    IOCTL_SERIAL_SET_TIMEOUTS has a different RI, RM, RC and WC (-1 instead of 10, -1 instead of 0, -2 instead of 0 and 0 instead of 5000, respectively)

    IOCTL_SERIAL_SET_WAIT_MASK checks for RLSD and ERR (like HyperT) but also checks for RXCHAR, RXFLAG, CTS, DSR, BRK, and RING.

    IOCTL_SERIAL_SET_QUEUE_SIZE has an InSize of 4096 (instead of 8192) and OutSize of 2048 (instead of 8192).

  46. You probably have something else using that com port and it’s locked. Make sure your terminal program is closed.

  47. Hi, I am trying to read the data on COM7 (USB) on my machine.
    When add the event handler to the progam i get an JIT debugging error: Class not registered.

    Anyone expirienced this?

    I’m using Visual C# Express ed. on Win XP SP2

  48. port = new SerialPort(“COM5”, 9600, Parity.None, 8, StopBits.One);
    port.Open();

    USB Cable Off – > CPU 100%

    Help me

  49. Thanks for this article.i am new to .net development.i am fresher in development.
    i want to learn more deep in serial programming.
    i have connected to com1.
    i am able to check whether bonus card is present or not,but i want to raed data from card from a particular byte to n byte.
    so which method i have to use and how to use.plz reply me with syntax and code

  50. thinks for these information ,i want do this ,but in Visual Studio2003 . I mean open Port COM3 and have a communication with a modem and call from My Pocket PC

  51. hello,i want to require vb.net code for reading stream of data asynchronously from serial port using multithreading as a background thread,so that is required,if more than one RFID tag read by serial port at a time.so how i can store all the tag read by serial port.

  52. Dear All ;
    Would you please send me the tha samples data’s to compile in my own pc.
    Because i couldn’t achive to make the form in the appropriate shape,size or position.
    Thanks to whom it may concern..

  53. hi
    I’m using Visual Studio.net 2003
    I have installed the .NET 2.0 (not the beta version)
    and I cant find the name space
    System.IO.Ports
    any idea why
    please help me

  54. Zak:

    Visual Studio 2003 is only for writing code against the .NET 1.1 framework. Even if you have .NET 2.0 installed, you won’t see it in VS 2003. You need VS 2005. You can write the code with a plain text editor and compile it through the .NET 2.0 command line compiler.

  55. I am doing some serial communication to a divice using .NET 2.0. The device has a set of simple commands, each command and responce is a fix size. Each command will generate a responce and a new command can not be sent until the responce from the previous command has been recived. I have set the DataReceived event handler to a method that will read the responce data. That part works OK. There is a flag in the event handler that I set when I read the response. I poll for that flag to see when I can sent the next command. My question is is there any way I can know when it is OK to send the next command without polling? The DataReceived event is raised on a secondary thread. If there was some way to get the thread Id of the event handler I could do a thread Join to tell when the data reading is done.

  56. it is good. But if some one could explain about if someone need to get data from an epbx, wat method can be used.

  57. Hi… nice article 🙂

    btw..

    How can we communicate with our serials port on LAN environment.?.
    any idea how to convert rs232 output for tcp/ip input?

    PC < -> LAN/switch < -> Microcontroller < -> Rs232 < -> devices

    thanks:)

  58. Thanks for creating this, it has helped me greatly. This is my first day using visual C# express and tutorials like this are making progress possible. Hopefully I can contribute in the future.

    One note: In order to build, I had to comment the line //File.WriteAll(TempFile, html); out as I got an error “‘System.IO.File’ does not contain a definition for ‘WriteAll’. Not sure if I am an isolated case, but it doesn’t seem to affect the program.

  59. Allan,
    There isn’t enough info in your comment to figure out what’s going on. Try [ENTER] [ENTER] [ENTER] ATE1 [ENTER] The first set of [ENTER] commands is for the modem to detect the baud rate. ATE1 turns on echoing back commands so you can see if the modem is responding. Good luck.

  60. Hello,

    I’m a begginer, and I’m tring to do a simple terminal (receive only) for my
    pocket pc, built in C#, with CF.Net 2.0.

    I have 2 bottons, one for serialport.open, other serialport.close.
    And works fine, since it’s for a GPS connection, and I see it
    connecting/disconnecting.

    I have a label, that if I do a label1.text=serialport.readexisting(); it
    displays all.
    but if I do it in serialport.datareceived event, it get’s an runtime
    error…
    If I do anything like label1.text=serialport.readchar(); it get’s the same
    error.
    What I’m doing wrong?
    I only have some programming experience in Delphi and C++…

    Thanks for your help,

    jS

  61. Sorry I missed it.
    The problem it’s now solved, thanks.

    BTW there is an link error in SerialPort Terminal, the filename has a space, SerialPort Terminal.zip, and the link doesnt, so it say’s it’s not found…

    Thanks again for the help,

    jS

  62. Julio,
    I agree the file name is confusing with the space (and has been for a long time). I’ve removed the space from all the links in the post and the filename.

  63. Hi All

    I try to use this example to send a ATDT6129 command to dial an extension number. I got an error message from my Modem. If I try to use Microsoft Hyper termanal it works. Any ideas?

    Thanks

  64. Hi Coad

    This example is very good, but atd or atdt command doesn’t work. I have try other commands such as ‘at’, ‘ati4’ etc. they works. I don’t know how to send a atd or atdt command to my modem. At moment, when I send atd or atdt command to my modem it got ‘error’ message back. Any ideas?

    Thanks

  65. I am looking to setup serialport in VC++.NET V2. Do you have an example. All I wnt is to be able to read data from a microcontroller. I an new to VC++ and cant understand the c# example.

    many thanks

  66. I’ve been searching for the simplest way of coding the deligate to send received text to a textbox. I should have known it would be a fellow HAM who had the answer!
    Great stuff and very well done!

  67. hi,
    iam using visual studio3.0 and framework version is 1.1
    Now ia want to access the serial prot using c#.

    in this version SerialPort namespace can’t use

    how can i use API to access the serial port in C#(version1.1)
    or
    any method top access the SerialPort namespace in this version

    plz help me
    i want this very urgent
    plz send
    my email.id is
    gpremkamal@yahoo.co.in

  68. hi,
    regarding .net 2.0 being free, well, the sdk is free, but who wants to code in notepad? you will have to pay for visual studio 2005 lot’s of dollars, and my understanding is that the “express” editions are only free until november 2006.

    but there’s a free open souce alternative called SharpDevelop, at http://www.icsharpcode.net/OpenSource/SD/Default.aspx . i tried their version 1.1 a while back and it was not bad, except for a few bugs. i hope their version 2.0 (for .net 2.0) is better, but i didn’t try.

  69. Dear Coad, I am an MCA student and need your help in , in Bi Directional interfacing an instrument, wherein I have to send some Delimited String to the instrument with certain commands Like ACK NAK STX etc. and Take the Data Instrument sends, So far I have been able to receive the data from the instrument, but while sending the data I don't get any reply, and nothing reaches to the instrument, where as the cable I have made is correct, and I know there is something wrong with the code it self please help me I am posting the details below please guide me how I can send the string to the Instrument i am using c# 2005 Please guide me Thanking you in anticipation Rajnish

  70. Hello Sir,
    The code you have provided is very appreciable to me coz almost all my problems have been solved. But only one problem is there i m explaining you:
    I m using a RichTextBox to display all the data that is in Buffer, But while displaying that data that is coming to textbox is some symbols not the actual text data.
    Like as if we use HYPERTERMINAL a windows program where it will display all the calls,duration,Number etc. I want to display the same data in RichTextBox. Only the textual data.
    Plz Help????? Urgent??????????

  71. Hi, thanks for your article!
    I have a problem. In your demo program, after I click the “Close Port” when there are still data sending from the Serial Port, the application will die. And I have to use “Ctrl + Shift + Delete” to end it. Any method to solve this? With “comport.close()” and data still in process, where all the data will be sent to?

  72. Pockey,
    In a case like this, you can do something like when the user clicks “close”, in the form’s closing event handler, make a loop that check’s the comport’s sending buffer, when it is 0, then allow the close to contine. I’d also set the cursor to a wait hourglass and add a timeout (in case it takes too long).

  73. hi Coad,

    I am using serialport in framework 2.0 to make a connection to another port.I have some problem, some attribute in serialport are not has like AxInterop.MSCommLib.dll’s attribute, such as : in AxInterop.MSCommLib.dll, there are have EOF enable, Sthreshold, Inputlen, InputMode. But in serialport, there is no these attributes.

    One more question : Is serialport just suppose for Smart device (POCKET PC, WINDOWN CE)?
    I am writing a app to connect another machine to send/receive data.
    Please give me some advice!!

    Thanx for reading.

  74. Coad, thanks for the excellet article.
    I have tried to implement it in C++.NET 2 and below is some of the code in question which I am having problems with, when I run this it gives me exception which says BUFFER CAN NOT BE NULL.

    Any help would be greatly appreciated. I am working on a PIC MCU, I will make my work public on your blog once it works hopefully.

    void SendRs232Data()
    {
    // Instantiate the communications port – this is done in //the form properties of serialPort control from the toolbox

    // Open the port for communications
    serialPort->Open();

    // Write a string
    serialPort->Write(“Hello World”);

    int offset = 1;//The offset in the buffer array to begin //writing.
    int count = 1; //The number of bytes to read.
    array^ buffer ;//The buffer array to write //the input to.
    serialPort->Read(buffer, offset, count);

    serialPort->Close();
    }

  75. hi,
    I want to have local resources (COM1, COM2) available to a terminal server.
    I made my local serial port available in a session in Remote Desktop Connection window.
    On terminal server I can see my serial port mapped to some TS033 and TS034 ports.
    How can I open/use/connect these ports?
    private SerialPort port = new SerialPort(“TS033”, 9600, Parity.None, 8, StopBits.One); deasn’t work.
    On WinServer2003 it says: The given port name does not start with COM/com or does not resolve to a valid serial port.
    Thanks for any help.

  76. Jon,
    You’ve defined the variable for the buffer, but you need to create an array as well. In C#, it would look like this:
    byte[] buffer = new byte[10];

  77. Huy Tran,
    The .NET 2.0 SerialPort class is not for devices, only full PCs. There are 3rd party serial classes for mobile devices. The .NET classes are wrappers around the Win32 APIs, so some of the members are renamed and they may not all be avalible.

  78. coed,

    thanks for pointing me in the right direction. as you said buffer was not defined as an array correctly.

    the program sort of works but does no print hello world, it prints the numbber 5, which is the byte size i am looking to print. i expected hello to print. any ideas as to where i am going wrong? many thanks.

    void SendRs232Data()
    {

    serialPort->Open();
    serialPort->Write(“Hello World”);
    int offset = 0;//The offset in the buffer array to begin writing.
    int count = 5; //The number of bytes to read.
    array^ buffer = gcnew array (10);//The buffer array to write the input to.
    serialPort->Read(buffer, offset, count);
    lblSerial->Text= (serialPort->Read(buffer, offset, count)).ToString();
    serialPort->Close();
    }

  79. My project requires external GPRS modem attached to serial port to send and receive SMS messages.

    In addition to original Noah’s code at the start of the blog, I’ve laso added and changed some things according to hints in the blog (thanx, guys); following i s a short summary of my add-ons to make the modem work:

    1. Set modem handshake, like:
    serialPort1.Handshake = Handshake.RequestToSend;

    2. Prior to send first command, try to synchronize modem by sending “\r\n” after port.Open(), like:
    serialPort1.Write(“\r\n”); // sync purpose only

    3. Always use “\r\n” at the end of the command, like:
    serialPort1.Write(“AT+CMGF=1\r\n”);

    (just in the case of sending SMS message itself, I use something like:
    serialPort1.Write(textBox1.Text + “\u000D\u000A\u001A\n”);
    )

    4. As described in FAQ (Q1), use Invoke and event delegation, like:

    private void MyLog(string msg)
    {
    listBox1.Invoke(new EventHandler(delegate
    {
    listBox1.Items.Add(msg);
    }));
    }

    private void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
    // Read data
    string data = serialPort1.ReadExisting();

    // Display the text to the user in the terminal
    MyLog(data);
    }

    And this is it. After a couple of hours of being frustrated because of simplicity of using SerialPort class in .NET 2.0, but no result, it finally works.

  80. RE: Test,

    you dont say what programe you are using, but if you are sending and receiving data from the same port for a test, i suggest you wire up a NULL MODEM cable with one end connected to your COM2 port and at the other end connect PIN2 and PIN 3 using a wire. This will send what ever is in the Tx line to Rx line and you should be able to send TEST and read TEST on you monitor. A quick test to verify your cable is wired right would be to use hyperterminal. I hope I understood what you are trying to do correctly.

  81. I need to send/recieve data to/from a uC using rs485 as protocol. I use a transducer to get the PC’s rs232 and the uC’s rs485 connected and therefore I need to have the RTS signal set at the start of writing data and unset it after all bytes have been written.
    Unforutnately the given Handshakes set the RTS line but don’t unset them after write.
    Manually setting and unsetting RTS causes the RTS to be unset before all data have been written (although while loop until writebuffer is empty)

    P.S.:
    I can get it working if I run the obsolete c++ program, that was used for the same purpose, and send a command to the uC once. After that the RTS handling with the c# prog works fine. But there has to be a way to get it working directly from c#.

    Regards
    Matthias

  82. Hi…

    Your demo project is very good.

    In my application i want to read text recieived on PC comport upto a string and after that i’ve to transmit some data on my port. So can you tell me how i can do this.

    (e.g. I want to set the date & for that i have to wait until i receive text “Set Date :”. )

    Thanks,
    Vinay

  83. ClosePort() is also sending a byte ’00’ to receiver, how avoid it? I can’t set DiscardNull=true because I am using rs232 for binary data communication.

    Thanks!

  84. i have a problem when i use GetPortName , i take port name for Com like this Com4, and i use the following code
    ————–
    foreach (string s in SerialPort.GetPortNames())
    {
    cmbCom.Items.Add(s);
    }
    ————————
    the com4 is bluetooth . is anyonethat have any ideea about this?
    thks bidi

  85. Hello,
    I have a zebra printer connected to the com1 port, i use
    the serial port class to send command to the printer but an exception is thrown on the Open method
    “The given port name does not start with COM/com or does not resolve to a valid serial port”

    Can someone help me please!!!

  86. Hi friends;
    In my program I am calculating a number in Int16 type between 0 and 255, and then I want to send this number to my microcontroller via serial port in 1 byte. for example 139 = 10001011. But the command comport.write(string s) only accepts string format to send. if I convert byte = 139 to string type and then send, the ascii codes of 1 3 and 9 are going separetly. I want to send the byte as a whole- the Hex equivalent of 139 in one byte. How can I do that? please explain me with useful commands. I am very newbie in this subject but I have a little time to do this project. Please response ASAP. Thanks alot for your help.
    Best Regards
    Onur

  87. hello,
    I just use the sample program from SerialPortTerminal to get data from a machine, it can received data at first time, but if the machine make a new test, and the program can’t receive the data any more, after i restart the PC, the program can receive the data again. can someone help me.
    thank you.

  88. Need send to com1 command “{$04A$03$46}”. If send this commant on Terminal – all work. If send command in c# – dont work. Please Help me !

  89. @Sergey: something like
    byte[] b = {0x4a, 0x03, 0x46};
    Serialport.Write(b,0,b.Length);

    Is there a possibility to reach the Serialport handle???

  90. hello,

    I just use the sample program from SerialPortTerminal to get data from a machine, it can received data at first time, but if the machine make a new test, and the program can’t receive the data any more, after i restart the PC, the program can receive the data again. can someone help me.

    thank you.

  91. Thank you!! After trying to make sense of MSDN tutorials, I landed here, and let me tell you this is much better. But the SerialCom FAQ.zip can’t be accesses… Can you help? Or for the others that were able to access it before, please send it to ltl_piggies@yahoo.com. Thanks much!

  92. when i do “port.Open()”, it says

    UnauthorizedAccessException was unhandled.
    Access to the port “COM1” is denied.
    Make sure you have sufficient privileges to access this resource

  93. Hi
    Your Project is Excellent in every aspect
    I want to use some part of ur code in my industrial project i request for a permission please !!!!!!!!!!!!!

  94. hi everyone,

    i don’t know how to connect usb port in c# 2003,
    i can’t able to use 2005 because my projects are already developed in 1.1 ,any can help me

    thanks

  95. Thanks for such resourceful material on c# serial tutorial!

    I am just a beginner to c# and serial port programming, after download the SerialPortTerminal.zip and try with TC35i terminal, I discover the reason that causing “my modem not responce to my at command”.

    It seem to me that the comport.Write method does not send the “\r\n” I type in txtSendData textbox. Thus i add the “\r\n” string to the SendData() function as shown below and it works !!

    ==================================
    private void SendData()
    {
    if (CurrentDataMode == DataMode.Text)
    {
    // Send the user’s text straight out the port
    comport.Write(txtSendData.Text + “\r\n”); // <-- add "\r\n" here // Show in the terminal window the user's text Log(LogMsgType.Outgoing, txtSendData.Text + "\r\n"); // <-- add "\r\n" here } ===================================== Hope this could help those newbie like me to have a good starting experience in dealling the C# SerialPort and GSM terminal.....

  96. hello,

    thanx for this article, it helps a lot and is much better than anything else I found on the net!
    I have a question…
    I have two classes “MyMainClass” (let’s call it A to make it shorter…) and “MySerialConnectionClass” (A). A instanciates B and calls function SendToSerial. SendToSerial opens the connection and I add the event. then I send data to the device, and after some time the device is supposed to answer. the problem is that SendToSerial does not wait for this answer. How does the code have to look to make the function wait for the answer? I already tried a while-loop in the function which will only exit if a variable is true, and the variable is set to true by the data-receive event, but it didn’t help, if I do that the programm stays in this loop forever. I also tried Application.DoEvents() inside the loop but it doesn’t work. Any ideas?

  97. sth_Weird,

    What you need to do is attach to the SerialPort class’ DataRecieved event that will call your code whenever there’s incoming data. See the 2nd block of code on this post, that what it does. You can create the SerialPort class in your MySerialConnectionClass and put the DataRecieved event code there too.

  98. Hello,

    I am new to C# and this article has been very informative and helpful in the startup of my serial port coding. I was wondering if anyone knew how to parse the data coming from the serial port. I want to enter the data into 3 textboxs. I’ve been looking up information on how to do this, but haven’t found much. A sample code to startoff would be very helpful. Thanks for your time.

  99. Thanks to your article titled “Serial Com Simply in C#”, I was finally able to communicate with a serial device that I struggled with for quite some time. I was trying to use old C++ dlls that even though they worked in C++ .NET, they would not work in C#. Your article saved me!
    I learned alot about serial communications in the process too. I will definitely be studying the info posted on this web site.
    Thanks Again.
    Best Regards,
    Jim

  100. Hi, i’m trying connecting to aCisco Catalyst 3560, when I use the port.Open(); after setting all the properties, the port.CDHolding is False, so i cannot transmit data to the Serial Port If someone have the same problem.

  101. sir
    ur article is awesome
    im incorporating the same concept in my proj
    without using interfaces i should get the data from the port connected and
    convert it to the form compatible to the cimplicity
    software
    plz give the suggestion to do that
    revert imediately

  102. hi…
    your project seems interesting..
    can u give us a link of ur schematic design..etcs..
    so.. we can build/learn almost like u did…
    thanks.. 🙂

  103. hi guys
    currently i m trying to program PP- 6750 Access Controller
    but i only have a vb6.0 source code not the instruction set. the problem is i m writing code in c#. when i investigated the vb6 source code , it seems that it s too complex and too long approximately 35000 lines! do you think that i can do it in a short way by using c#?

    my mail: altantoksoz@myne.com

    thanks

  104. hi folks iam in halfway to finish my project. as i use 1.1 i wrote code on my own i can read the data from the port but unable to write that into a file in csv format. here i can create the file but iam unable to write the data received into the file;

  105. Hi,

    I currently programming an atmega168 which is connected to my computer. The communication between the 2 devices works but c# doesnt always take the correct things. For instance if i send with my atmel 123,456,789 (100ms between each number) then my c# application sometimes gets 123,45,78
    He just looses some numbers. Is 100ms to fast for a serial port? So that the buffer is full and he cant get any data ? While if i listen to my serial port with hyperterminal i receive all my data correct.
    Something weird.

    Thanks for helping.

  106. Hi Dear Noah,
    Thank you very much Noah! It was a very nice and helpful tutorial for me. I have jumped to C# in Visual Studio 2005 nowadays. But I have a problem with showing the incoming data on my textBox. It works with MessageBox, but not with my textBox. It gives error with my textBox. It gives yellow line and says something like, How to make Cross-Thread Call…. Could you help me?

  107. Hi I just wanna know if the DataReceived event of SerialPort in C# .Net 2.0 also works in USB to USB?if yes how could I make it work thanks

  108. Gemballa,
    Keep in mind that data comes in to the serial port’s buffer whenever it is avalible and not in nice easy to use packets. It can be a challange to parse the data correctly to where it appears you have it all.

  109. hi noah
    i had cached the incoming data from the rs232 port
    into the csv file format.
    now i need to convert this into a cimplicity file format.
    i have explored cimplicity in many ways.
    but cant convert to the cimplicity compatible format.
    Is there any provision for it noah.
    i need to convert the csv file raw data(#12$0$0$0) and so on.
    plz give any suggestion so that i could finish as soon as possible.
    revert immediately anyone

  110. i am doing a project on railway signalling in vb.net.
    my requirement is i have to control or adjust the form designed in my computer from another computer connected through a serial port cable.
    to be in detail i have designed a track circuit with some picture boxes and buttons.so i need to change the color of the picture boxes and buttons through xl sheet in another computer by changing the status from 1 to 0 and viceversa.

    first i tested for the communication between two systems by writing a chatting application which is working fine but i am not getting the idea to do the main task

    please help me out in this

  111. hi balaji thanks for offering me help.
    i dont know whether i can send u the whole details but i will try to send to send atleast the main code.
    first of all i just want a confirmation whether is it possible to change the status of a programm in one computer with xl sheet or some sought of table in another computer through serial port.
    as i said in my previous post, communication between the two systems is possible.in that we can only send and receive text strings.

  112. Your posts were very helpful.

    “Access to the port COM4” was being denied and I have absolute and total authority over this computer! Simply switching to a different USB, which also changed the name to COM6 worked for me!

  113. Hi, i´m from Argentina. This page was very usefull for me to make my modem make a call. Now i want to know how to know when the other side pick up the phone and answer the call i make or when is busy??
    this is my simplified code to make a call:

    SerialPort myport = new SerialPort(“COM1”, 9600, Parity.None, 8, StopBits.One);

    myport.NewLine = “\n”;
    myport.DiscardNull = false;
    myport.Handshake = Handshake.XOnXOff;
    myport.Open();
    myport.Write(“atdt xxxx\r”); //xxx phone number


    Now, how can i know if is busy o someone answer my call?
    Thanks for your support, all of you!!!

  114. Hello,

    Is it possible to develop a code that enables the COM port to send and receive data at the same time (bi-directional communication)? and if the answer is yes, how is it possible to develop such a code?

    many thanks.

  115. Luke,
    You can think of the send and receive as two completely separate operations. So you can definitely do “bi-directional” communications, just send data whenever you need to and receive data whenever it comes in. Whether your device support bi-directional communications is another story entirely and up to the device.

  116. Well i have created two infrared devices that can send and receive data (using infrared LED to transmitt and Photo detector to receive the data on each device) each device i connected to computer using RS232 in order to do a bi-directional communication between the two computers using the infrared devices that i created. I used hyperterminal to test the devices and they are working except that the letters being received have different symbols than the key pressed! what i am trying to acheive is to use c# in order to send a “hello” word for example from one computer to the other and to make the second computer send an acknowledgement back saying “the word have been received” as an example. So how can i acheive that? is it actually possible?

  117. hi all
    i need one to help me about the interfacing the at89c52 to the pc . i finished the connection of MAX232 AND AT89C52 BUT THE PROBLEM IS HOW TO INRTERFAC PC TO IT.i think that i must have vesual basic software in my pc i thik that,
    but i dont have it.
    please help me
    thanks all

  118. hi.
    its nice to see such competent people on net.
    but i am still not satisfied bcz my requirements are still not fulfilled.bcz i wants to have input from my 8051 uc and process that data in c++ programme.for example if i press a button on keypad of uc then pc should show a message well come if i press any other button it sholud say good bye
    .or ican do numeriacel calcualtion.so kindly guide me.my email is

    soheel_657@yahoo.coml

  119. Hi Miguel and All:

    First of all thanks for such a nice article. Secondly i want to dial my ISP to connect to internet using Modem on Serial Port…
    Miguel i think u have worked on this.. can u give me some more help

    Waiting ,

    n thanks once more..

    SAEED

  120. hi all
    very nice article!
    I have a problem , a serialPort is in use by an another application , I want to monitor its data ,how can I do that
    thanks

  121. Saeed, i´ve been in vacations. First i have to check something that coad askme about my problem. In your question, i don´t understand very well what you want to do, but the code i write up in the post works very fine to dial any number you want. I´m using VS2005 with Serv Pack and a internal modem on my notebook. I recommend you to use the static method: string[] myPorts = SerialPort.GetPortNames(); so you can see what aviable ports your pc have. Then you can use my code post up here to make your modem dial a phone number. I think that if you want to handle the internet connection you will have to use the
    void myport_DataReceived(object sender, SerialDataReceivedEventArgs e) method to handle what you want. The code up load by Coad is very help full. Just remember to make phone call via the modem you have to use AT commands and have all your connection cables set well (i mean the line cables with the modem). my mail is: miguelb_fiuba2@hotmail.com bye and thank every one for all the post.

  122. now i face to the problem that ..
    when i change the baund rate from 38400 to 9600 and begin initialize the port (serial port sp1;)it dosn’t work?
    why?

  123. the device manager on my laptop doesn’t show any serial ports, but getportnames() returns “com3”. what does that mean?

  124. Has anyone managed to get the SerialPort class to work using redirected com ports on a Remote Desktop Connection?

    I’m running the SerialPortTerminal example app on the server (using RDC to connect to the server) and trying to send/receive data through the client PC’s com port.

    Sending data to the client port seems to work okay but no data is received. I know MSComm (VB6) had problems with Remote Desktop but I was hoping that framework 2.0 serial driver would do the job.

  125. Hi Noah, first of all thanks for this tutorial, it’s very useful for me, a newbie of C#.NET.

    I’ve encountered some problems with serial port communications between PC and a reader, hopefully can get some help from you.

    I just wrote a simple program to send a byte array from PC to reader and the reader will send back another byte array to the PC. here is the code:

    private void button1_Click(object sender, EventArgs e)
    {
    open_serialPort1();

    byte[] data = new byte[7];

    serialPort1.Write(addCheckSum(resetReader), 0, 4);

    serialPort1.Read(data, 0, data.Length);

    close_serialPort1();

    string str = BitConverter.ToString(data);

    richTextBox1.Text = str;
    }

    When I first time press the button1, the reader can receive the byte array correctly from the PC and the PC also can receive the data which is sent back by the reader, everything is correct.
    But when i press again the button1, only the reader can receive the data from PC, but PC cannot receive any data from reader, the richTextBox1 showing 7 bytes of 00.

    Can you pls help me to figure out the problem, is there anything wrong with my program?

  126. Hi im trying to get my c#.net app to work the problem is that when using
    SerialDataReceivedEventArgs it echos all bytes/strings that is sent to the
    port. If I send the AT command it always echos the AT and OK I just want it
    to echo the OK.

  127. RESPECTED SIR ,
    I AM STUDENT OF THIRD YEAR,STUDYING IN INSTRUMENTATION AND CONTROL ENG.
    SIR,I AM DOING PROJECT, IN WHICH I WANT TO READ THE SIGNAL FROM COM PORT1 THROUGH RS232 PARALLEL(DB25)AND THEN WITH RESPECT TO TIME,I WANT TO DISPLAY GRAPH ON VISUAL BASIC 6.0 SOFTWARE.
    I WANT CODE IN VB,WHICH WILL DISPLAY THE GRAPH WHEN THE INPUT WILL CHANGE,GRAPH ALSO CHANGE FROM RS232(DB25). I HOPE U WILL DEFINEATELY SOLVE MY PROBLEM.I AM WAITING
    FOR UR RESPONSE TILL WEDNESDAY.

  128. i need some help i have a bluetooth printer and send the string to the port COM9 example puerto.WriteLine(“something”);
    but a need send to the printer code for barcodes is send it by hexadecimal code o how?

  129. Pls help me!
    I am learning programing for Serial Port in C# and I have encountered a problem. I don’t understand why SerialPort.Write method don’t act. I used that method , but I didn’t receive data from the port.
    Pls show the reason!

  130. Thanks for the useful post on serialport. I am making a program for reading numbers and a newline trigger from serial connected balances.
    Just a note on your SerialPortTerminal program. There seems to be no System.IO.File.Writeall method anymore, and I think .WriteAllText is what you need there.

    I get the part about setting a buffer and reading it and writing it, but how do I write it to any active field on screen? I don’t want to write to file or console, but rather to an information management system that can take key entries. Somewhat like a keyboard wedge.

  131. am kranthi
    am working a project in small company
    am fresher so please give me code about my problem.
    what am saying my sir one modem(that is one type of modem) connected to com1 port(serial port) in my pc.
    am using .net 1.1 with c#.net , so i will created one form.
    am used one text box and one button in that form ,
    we will type some message in that textbox and click button.
    how will send that messge to one any mobile number through comport settings(serial port).
    please give me that code.please u can solve my problem.

  132. how will know the receiver is availabel or not?
    we sended the data to receiver but that is availlabel or not how will know.that is not availabel how much time will wait and how will display receiver not found.

  133. Thank you very much for the code…if I could ever return the favour feel free. Recieving serial was not as straightforward as sending.

    But using invoke and the way you’ve demonstrated has really really help…cant thank you enough.

  134. I used this code as a starting point for interacting with an old barcode scanner that connected via RS232. Only real thing to add to what can be found here is that I needed to set RtsEnable to TRUE in order to receive data, otherwise the scanner just hung.

    Oh, and if anyone’s looking for info on a Handheld Products (formerly Welch Allyn) 3400 scanner, don’t believe the defaults given in the user guide – it’s 9600 baud, 8 data, 2 stop and no parity! 😉

  135. Hi, Folks,
    Can anyone help me with next probem
    I have notebook with 1 Com (rs232) port.
    On this laptop also have modem and infrared device.
    I d’like to create from modem or infrared another COM rs232 port, So bi visible under pure dos withouth any drivers.
    Some of programs under dosr does not working when using PCMCIA – rs232 ot USB – rs232 adapters.

    Best regards
    Yasser

  136. Thanks for the great site. Intresting thing was i was looking for a tutorial for SerialPort, since my try went somehow wrong (i thought).

    Im experimenting with serial communication between BASIC Stamp (BS2 for now) and PC; i already found the SerialPort class in .NET and was really glad for that. Unfortunatly the DataReceived event handler isn’t willing to work, neither at my code nor at yours (SerialPortTerminal) ; when using e.g. PuTTY it displays my data sent.

    I tried both in PBASIC: SEROUT and DEBUG

    SEROUT 16, $4054, [“100 GET”, 13]

    as well as

    DEBUG “100 GET”, 13

    (of course both are equal, but you never know…)

    that sending both ways works is, as written, visible in PuTTY

    in all 3 testing apps (my, yours and PuTTY) the serial settings were the same (9600 baud, 8 bit, 1 stopbit, no parity, no flow control)

    and the .NET apps don’t even jump into the event-handler (it never stops at the breakpoint inside).

    Maybe you have a hint for me?

    Best regards

    Syntax76

  137. oh yes, to mention:

    i use Win XP x64 may be this is the reason? But in the docs for this class is explicitly written, that it works under XP x64…

  138. I get an “Access to the port ‘COM1’ is denied” when I run the GUI version of my C# program, but when I run the console equivalent, I don’t get the error and everything works perfectly.

    I did the testing with the console and put the cs file in the other project, renaming the namespace of course. Why is that? I don’t have a similiar problems with the other COM ports, but I need to use COM1 since the others are taken.

  139. I had the “UnauthorizedAccessException” error. It turned out that running the application from a mapped network drive was the problem. If you have this issue, ensure its running from your C: drive and see what happens.

  140. I do run it from the C drive. I think there is a problem with using the serial port in other forms other than the main form. If I put the code in the main form, it works fine.

    Whatever works. LOL.

  141. Hi,
    I am sending data in bytes over serial port using .net 2.0.
    problem is I am not getting the response from the device.

  142. Hi I have writen apog by using MSCOMM.ocx in vc++.net(windows application form) but I can not get numbers more than 127
    if u can help me about this my prog must get this valuse and put them in thier text boxex and thier showers and I ‘m getting data from 3 ports at one time .
    if i can’t use mscomm in vc++.net please guide me to use serial port component
    thanks a lot

  143. Hello their developers.. can you help me with my problem… i’m using a foot pedal device and i want to read the data it sends, so i use the serial port in VS2005 but i dont know what code for it to recieve the data from the foot pedal??… can anyone help me.. pls

  144. Hello all developers

    i have to develop an application in dot net which communicate with a infrared sensor which count the number of people passing away from. there is need of serial communication.

    Dot net know how to start of it.

    How to detectet by the application whether device is connected or net, how to receive and sent data.

  145. Hey,

    I found your article which is an execellent one. I implemented okie but I got problem with receiving reply message:

    In order to receive reply, I changed a little bit in your send button event:

    port.RtsEnable = true;
    SendData();
    port.RtsEnable = false;

    But with the same command send, I received diffrent reply messages:
    < << Sent: 02 30 D0 31 30 30 31 30 30 30 52 03 >>> Received: 60 83 06 AF 4C 36 56 76 0C 00
    < << Sent: 02 30 D0 31 30 30 31 30 30 30 52 03 >>> Received: 60 E8 15 32 33 35 17 00 00

    Could you please help me? I uploaded my code here: http://download.yousendit.com/BEF9777251C1D8EF

    This is very urgent project of mine, Can you please spend some time to help me? Could I have your email, I will contact you?

    Thank you very much,

    Joesy

  146. I need to to simultaneously open and use 8 Comport!

    Hello there,

    Im communicating with 8 serial devices (Atmel 89S52 microcontroller) using usb2RS232 adapter connected in usb hub. Enumerated port are Com1 to Com8.

    In order to send and receive data, i have to open and close each comport and sequently move to next comport.

    I can exchanged data to and from serial devices however most of the time it throw an exception ” access denied to Comx”. And eventualy my application would hang up.

    I figure its hard to close and dispose serial port resources in moving from i.e. Com3 to another Com4.
    Even I give enough time to Close the comport using timer.

    I would like to Open and Use 8 Comport (Com1 to Com8) simultaneously.

    I would deeply appreciate any hints, clue, HELP from anyone!

    Jun

  147. I got a probem when event fires: DataReceived:
    Frame: The hardware detected a framing error.

    Can you help me to explain about this error: When, how and where this error ocurrs?

    Thanks,

    Joesy

  148. Hi,

    I’m working a project using audio data gathered with a mic, using C# and DirectSound, that I’m trying to send to a device via serial, however because I’m so new to this, I cant get the audio to stream. I can send files already recorded, but the goal is a “live” transmission of sorts.

    Can anyone possibly help me?

    I’m new to C# (like 5 or 6 days new…), so code with an explanation would be a great big help! Thanks!

    JD

  149. Hey Everybody! i think this is a little more complicated but maybe someone could help me, am working on a PIC – 18F258, i am sending data between the PIC and the program that Noah created, but every time my PIC send data it only appear 3F for every hex that my pic send, the weird thing is when i test the pic with terminal v1.09 because it works perfect, every hex that my pic send appear on terminal but can’t do this with the program in c#, could someone give me some help? plz……….. my e-mai is pcasorla124@gmail.com

  150. Currently I am doing my final year project and I came across Serial C# interfacing . I want to generate 40khz,50% duty ctcle square wave. Can any one help me PLZ?

  151. hi guys.. i need to read tags using rfid reader. the reader is connected to the computer using serial port. can anyone advise me the codes for receving the tags data?
    thanks

  152. hi guys.. i need to read tags using rfid reader. the reader is connected to the computer using serial port. can anyone advise me the codes for receving the tags data? i’m using microsoft visual studio 2005.

    thanks. your help is appreciated.

  153. upon receiving properly formatted data according to a given protocol, i need to send back an ACK message within 2ms. is there any way this is possible using the SerialPort class? or is this only possible with drivers? i would really like to keep my implementation as simple and high-level as possible. i really don’t want to have to write a driver to do this.

    any suggestions?

  154. Thanks for sharing your great info – I have a VS2005 .Net2.0 app which is reading a Truck Scale. It works great with 1 huge exception – the datareceived event is not firing soon enough. I am running a port monitor along with my application and realize my application lags about 20 lines (roughly 12 characters each line) behind the actual data being read in the port. Is there a way to speed the datareceived event to trigger faster? Each line being received from the scale ends with a CRLF. Thanks for your help!!!

  155. Hello, I am new to Serial Port Programming. Liked your article. I have bought two usb to com adapters and gender changer (is this the same stuff as null modem adapter?). I setup everything, and I now have COM3 and COM4 ports (USB2COM adapters). If i programaticaly send writeline on com3 port the light on the port blinks. My question is how to loopback these two connections, so I can test software with it…. I think the problem is, that do not have null modem adapter. Please if anyone has any ideas and comments please, let me know. Thanks!

  156. Thanks for the great sample. I have one issue, I used the code provided to lsiten to a port that has a card reader attached to it, I am receiving the data in the receive event but it gets split, so i receive part of the message and then receive the rest. Your assistance is much appreciated.

  157. Hi I am trying to write to a serial port using a protocol which looks like this

    < data >

    and heres is how i am writing it

    public void SendDatathruPort(int addr, int length, int comd, int checksum)
    {
    byte[] data7 = new byte[17];
    //byte[] data1 = datainuput();

    int totalsum = data7[0] + data7[1] + data7[2] + data7[3] + data7[4] + data7[5] + data7[6] + data7[7] + data7[8] + data7[8] + data7[9] + data7[10] + data7[11] + data7[12] + data7[13] + data7[14] + data7[15];

    checksum = (totalsum) & (0xFF);

    data7[0] = (byte)addr;
    data7[1] = (byte)length;
    data7[2] = (byte)comd;
    data7[3] = Convert.ToByte(“1”);
    data7[4] = Convert.ToByte(txBxP1.Text);
    data7[5] = Convert.ToByte(txBxP2.Text);
    data7[6] = Convert.ToByte(txBxP3.Text);
    data7[7] = Convert.ToByte(txBxP4.Text);
    data7[8] = Convert.ToByte(txBxP5.Text);
    data7[9] = Convert.ToByte(txBxP6.Text);
    data7[10] = Convert.ToByte(txBxP7.Text);
    data7[11] = Convert.ToByte(txBxP8.Text);
    data7[12] = Convert.ToByte(txBxP9.Text);
    data7[13] = Convert.ToByte(txBxP10.Text);
    data7[14] = Convert.ToByte(txBxP11.Text);
    data7[15] = Convert.ToByte(txBxP12.Text);
    data7[16] = (byte)checksum;
    comport.Write(data7, 0, data7.Length);

    }

    and this is how i call it

    private void setvalue_Click(object sender, EventArgs e)
    {
    // Send the user’s text straight out the port
    //comport.Write(txtSendData.Text)
    //SendData();

    SendDatathruPort(0x7B, 14,0x0A,0);
    }

  158. When I set the values it doesnt seem to be seeting the values on the controller ,… any help is appreciated

  159. hi;
    Is there any way for me to use my .net 2 .exe aplication in other PCs (or platforms) which has not .net frame work?
    regards

  160. Hi Noah and all
    This is a very useful page and has helped me greatly.

    As a matter of interest has anyone had issues with
    SerialErrorReceivedEventHandler on a windows XP pro
    SP2 laptop using USB serial converters?.
    My code displays framing and parity errors ,but will not
    generate any events using USB on XP.
    A PCMCIA serial card port on the same laptop works fine.
    The same code also works well on Win 2k pro using either PCI or USB ports.

    Best Regards
    Geoff

  161. I’ am trying to control a power suply using RS-232 interface
    But the power suply has a frame of 26 bytes

    I am newbie and I just now hot to send strings through serial port, not how to sent bytes,

    Please help me

    rac28_03@hotmail.com

  162. Hi,
    I need to read binary data from comp port on C#, do I can use
    byte[] signal;
    signal = new byte[5000];
    port.Read(signal, 0, 500);

    And how to be able to read binary frames?

  163. Hey Guys,

    I can get a list of com ports in use to print out to the command window but i would like more information than just “com1, com2” i would like to see for example “com1 Max Stream UVG, com2 4G cruiser mini” get my drift?

    Any one have an idea how to do that?

    Thanks!!!

  164. Hey nice site!
    Am currently doing a project with CS and USB to UART controller (Virtual COM port), my aim at the moment is to be able to write a string of data from one from COM1 port to COM3, then get a reply back acknowledging reciept.

    what have done so far is use some “if and else if” statment in my OUTPUT box (textbox) so that if the input we require is inside the textbox, we get a reply in the other COM port saying recieved.

    This works fine, BUT AFTER RECIEVEING THE 1ST TEXT, I CAN’T READ NEW TEXT INPUT, BECAUSE MY READ COMMAND READS ALL THE TEXT IN THE OUTPUT TEXTBOX, I HAVE TRIED READLINE, IT DOESNT WORK NEITHER.

    Can someone advise on what method i can call to read new string from my output textbox rather that reading everything, and also how can i go to a new line automatically inside a text box. (this doesnt work \r\n)

    if (this.txtData.Text == “Hello”)
    {
    serialPort1.WriteLine(“recieved\r\n”);
    }
    else if (this.txtData.Text == “Hiya”)
    {
    serialPort1.WriteLine(“hey”);
    }

    so what am saying is that “Hello” goes into the output text box and “Recieved” is printed out, but when “Hiya” goes into the same output box, the readExisting() or readLine() method reads everything inside the text box and doesnt print/writes out “Hey”

    Please help if you can!

    Regards
    Jones

  165. I can get SerialDataReceivedEventHandler to work if I send a command to a serial device in a timer or click botton event. However, if I use a while-loop to continue send comands with a Thread.Sleep(1000) in between, the receive event does not even fire once. Why cannot I use while-loop in this case?

    I would greatly appeciate your help.

  166. HI i am also trying the same thing with vs.net 2005.
    what i am looking for?
    I am having a weighting scale which will give lt/wt/depth/hgt etc.
    I am a system with .net 2005
    using RS 232 cable i am trying to get those data from scale to my application.
    for that using serialport class i am configuring the com and then i am taking the data from scale.

    Problem facing:
    step1: In my .net windows applcation i click an Activate button.In this i had written a code
    a.send a request to scale
    b.sclae will send an acknowledgement as * to my application.
    c.then user will keep an weight in scale and click print button in device.
    d. In my application i kept a message button which user can peform above step.
    e. then i am getting the bytes of data to my application and am storing thta information into my database.

    Now problem is
    In 2nd time if user has kept another weight in scale and user click a print button then its not getting that data. Even i kept a while(True) loop.

    How can i achieve this in my application.
    is there any way to achieve that 2nd, 3rd … data from scale with out restarting comport repeatedly.

    if u had give code it will be very helpful to me.

  167. Hi, I am using VS 2005 and have a Thermal Printer connected to COM1. I am trying to sniff text being send to the printer but every time I try to open COM1 it will give me the following exception:
    {“The given port name does not start with COM/com or does not resolve to a valid serial port.\r\nParameter name: portName”}
    My printer is plugged in and turned on, the driver is installed… I’m not sure how to get rid of the exception.

    Thanks for anyone’s help in advance!

  168. Hi,
    How to send and receive data from com1(port)?
    any dll files add to the port access?
    can you replay clearly?

    Many thanks s s s s s s s s s sssssssssssssssss

  169. Hi, I would like to ask the same question as Haluk.
    I am running the serialport transmitting program very fine in computer which using english language for non-unicode, and also standard and format, but when I change them to Chinese PRC, I got problem to send unicode 192.

    I am using VB .net,

    Dim buff() As Byte
    Dim i As Integer
    If SerialPort1.IsOpen Then
    ReDim buff(2)
    buff(0) = 192
    buff(1) = 80
    buff(2) = 192
    SerialPort1.Write(buff, i, 3)
    End If

    when I tried to capture with hyperterminal, i will get 192 192 80. Why this happend, and how to solve?

    I really hope you can help me.. Thanks

  170. hi
    I write a Pocket PC program with c# and use it’s serial port to communicate with my device. I have a problem with serial port. I defined a “static” class for serial port
    communication. I have several form and used serial
    class in most of them. When I run program, for firs time
    I can connect via serial port. after first communication
    I never can send or transmit data with serial port.
    I checked serial port to be open. It open but do not response.

  171. Hello,

    I have a question about programming in C# and .net 2.0 with serial ports..

    I’m writing an application to read data from a micro controller. I know the data array the controller spits back is 24 bytes.

    I used the bytethreshold property and set it to 24. What the program does it sends a hex 93 command and its spits back data. Problem is when I started using the bytethreshold property and if I hit the send command for a second time the data in the array comes back isnt in the order it should be.

    The reason why i used the bytethreshold property is to prevent the datarecieved event from firing until I have all the data in the buffer then I can store the data in my byte buffer.

    What is the issue? Should I be clearing my buffer after each send command?

  172. Dear,

    the application usually works, when I open first in the hyperterminal and closed.

    Else makes this procedure the application doesn’t work.

    Did anybody already go by this problem?

    I am using C #. Net 2.0

    Thanks

  173. hello,

    i’ve got a problem with comports, too. i need a way to close a opened comport in c# after the device on it already were turned of. it’s not enough for me just to catch the exceptions, for regulare it would be myPort.Close(); but if the device is missed at the comport you’ll recive a unauthorizedaccess exception.
    someone an idea?
    i would be very happy about some ideas –> stefan(at)matokic.de
    thanks…

  174. hi i’m working with serialport1 and i send to an aplication in C# 10 bytes and the aplicacion receive just 8 byte always, my buffer rx is of 20 bytes, what is wrong
    this is reception

    private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
    {

    int total = serialPort1.BytesToRead;// here always read 8 just bytes and bufer_rx is a20 bytes
    serialPort1.Read(bufer_rx, 0, total);

  175. Hi German … Check this out

    Just put in a Thread.Sleep(250); in the start of the method, then it haves time to read all the incomming date in the buffer before empty it.

    private void port_DataReceived(Object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
    {
    Thread.Sleep(250);

    int total = sp.BytesToRead

    buffer_rx = new char[total];
    sp.Read(buffer_rx, 0, total);

    for (int i = 0; i < buffer_rx.Length; i++) { sB.Append(buffer_rx[i].ToString()); } MessageBox.Show(sB.ToString()); sB.Remove(0, sB.Length); //sB is a StringBuilder }

  176. hi,

    I need help in a serialport communication program. i will have 2 form. form1 and form2, form1 will allow user to select their comport, baudrate,parity etc in a combobox. when i click ok, a connection should be establish in order for me to run form2. i have no idea how i shd write it, therefore i need some help here.

  177. Ashley nailed the problem for me here: “Setting DTR to enabled and handshaking to hardware should power the pin that manufacturers use for power robbing as well. ”
    I added “comport.DtrEnable = true;” and that solved my DataReceived problem where it would output the result after passing an AT command to my ISU to send SMS messages.

    Thanks Ash 😉

  178. Hi mister, i doing my final year project which will link up to a solar panel to accuqire the voltage reading , it will go through the analog to digital conversion , so the signal( voltage reading becomes digital) , it will then send to a wireless transmitter , and send to the receiver which will then be interface to the computer thru rs232 to usb converter to comp.

    currently i using C# , do u have any sample program to plot graph of the voltage reading against time ?, and since the voltage reading from solar panel varies, do i need a timer or so ? thanks alot for your kind attention , i using visual studio 2005

  179. Hi!

    I’m using C# to create an interface between my card reader and my PC. I usually got Access denied but when i booted the system without my device connected to it, the error didn’t appear when i run the program. Is there any way to prevent windows from accessing the ‘COM1’? i also require some help to further communicate with my card reader as my establishment with the reader is done using methods from its dll but the reader doesn’t respod. Pls guide me in some direction on how to proceed further? Any help is appreciated.

  180. msdn says:
    PinChanged, DataReceived, and ErrorReceived events may be called out of order, and there may be a slight delay between when the underlying stream reports the error and when the event handler is executed. Only one event handler can execute at a time.

    quote
    Only one event handler can execute at a time…

    does this mean that if a 1st serialport event is executing and have not yet returned while a second event fires.. the second event is lost to oblivion…

    I’ve setup a microcontroller to send 2 parity errors but only one error receive event fires..

    also is the pinchange event can only fire in the breakstate i.e. when the port is not sending and receiving..

  181. Great tool! I used it to communicate with the pic 16f877 and it worked perfectly on the first time. I will add some exception handling, for when the pic does not reply to the pc 😉

    Thanks!

  182. Hi I am using this
    string st = serialPort1.ReadExisting();
    int j =recievedB.ToString().Length();

    I am using .NET 2.0 serialPort() class and ReadExisting method. I am interested in getting value not length. How do I do that. Thanks in advance.

  183. Sir, i am desinging fapplication in asp.net in which i wnat to use a port to send sms by that port to attach mobile with that port
    please help i am not getting port response

  184. Hi
    iam working on one application, using my app i should read data from device using com, i know how to read data from port.
    my question is how to identify/ scan the port(com1 or com2,,etc)? is any specfic way is there.

    plz help me on this.

    Thanks

  185. hi coad,
    i am trying to fire an at command on a device using your serial port tools but device si not reponds to these commands………..

  186. hey i want to connect foot pedal for player with the use of Asp.Net 2005 with C#…. online…
    Can you guide me How it will bw possible?

  187. Hi

    I have 3 serial devices. Should I use 3 hreads to handle each incoming com port? is there any way to handle this issue with one thread/function, how?

    Thank You

  188. Hi,
    when i send AT command to my modem it is not responding. In hyperterminal AT commands work fine, i was able to send SMS using it. When i use AT command in C# 2.0 there is no reponse from the modem. Modem is in the server, i have created the application in my server and running it from my local machine. Please help

  189. hi, I am using visual C# 2008 express edition and the code i found in this page does not compile, and it does not seem to be able to be converted either.

  190. hi, I am using visual C# 2008 express edition and I want to close the Serial Port forcefully while it is receiving the data from the instrument. Can It be Possible to close the port while it is receiving the data? If Yes, How?

    Please help me out

    Amit

  191. hi, I am using visual C# 2008 express edition and want to Close the port while it is receiving the data. Is it Possible? If Yes, How?

    Please Let me Know.

  192. Hi, im working on a project, programming with C#. Ive got to reset my module by sending a low state level through the TX. Actually when my module receives a low state for a certain time e.g 3sec. It resets itself.

    My question is that is it possible to send a “0” through SPP with C# or C++ and will the module decode it as a zero and reset it or will it just light up my TX lamp? please help me, i’m new to programming and first time i’m doing application programming.

    Thank you.

  193. In early my baud rate was 9600 & its successfully capture data which coming through comport. But in another machine baud rate was 4800 & now its not going to capture data. But in Hyper Terminal its going to capture data. Why…….. ?

    email to – kasunrox@yahoo.com

  194. Nice article.
    but I want to convert receive data into ascii format and also how would we know that receiver is ready to send data? Also, in my project reciever continuosly send data and my application has to receive it and whenever the data cross the high point value(that is set by programmer) then application has to send signal via serial port and then control it. How I can do this? please help me in this.

    Thank you very much.

  195. If using this nice application for sending SMS using AT commands then you can modify this part of the code:

    As you know you have to press ctrl+z to send SMS, this code will do small trick…just write ^z instead of CTRL+Z and message will be sent.

    // Send the user’s text straight out the port
    if (txtSendData.Text.Contains(“^z”))
    {
    comport.Write(txtSendData.Text.Replace(“^z”,””) + (char)(26)); // <-- add "\r\n" here Log(LogMsgType.Outgoing, txtSendData.Text + "\r\n"); // <-- add "\r\n" here } else { comport.Write(txtSendData.Text + "\r\n"); // <-- add "\r\n" here // Show in the terminal window the user's text Log(LogMsgType.Outgoing, txtSendData.Text + "\r\n"); // <-- add "\r\n" here }

  196. i am new with C# and with object oriented languages so please explain to me in more details.
    i have no problems sending data to the serial port but im not quite sure of how to receive it. i understand that with DataReceived i receive the data but how the program knows how many characters it will receive? and after i receive it, how can i check what kind of data i got for example if i got ‘A’ in ASCII?
    thank you very much your article is very helpful.

  197. Hi,

    I am using Visual Studio 2008 and C#.net

    I am sending data to serial port. While receiving It gives incomplete or extra data which comes into the recv buffer as I am using SerialPort.ReadExisting() method
    ( my receiving data is 4 bytes)

    Right now I have solved this problem by putting delay in two commands using Thread.sleep().

    But the problem is due to delay it takes time to execute and as I have tried to put minimum delay from where the code works fine. But it’s not the better solution.

    So will you please help about same?

    Thanks In advance

  198. Hi,

    I am using Visual Studio 2008 and C#.net

    I am sending data to serial port. While receiving It gives incomplete or extra data which comes into the recv buffer as I am using SerialPort.ReadExisting() method
    ( my receiving data is 4 bytes)

    Right now I have solved this problem by putting delay in two commands using Thread.sleep().

    But the problem is due to delay it takes time to execute and as I have tried to put minimum delay from where the code works fine. But it’s not the better solution.

    So will you please help about same?

    Thanks In advance

  199. i try to make an echo function. when i press a button in my program it sends string to my project which sends it back and my program suppose to get it and compare with the data i sent.
    the problem is when you press the button couple of times fast it sends the same string couple of times and receive it as it is one string which is note equal to the string i sent. for example i press the same button fast three times and send “123” each time, the program receives “123123123” which is not equal to “123”.
    how can i make the program not able to send any data until it finishes to read?

  200. Hi,
    This is very appreciating article . But I have a question. How can I receive voice call data (i.e voice I speak and voice my receiver speak) by this serial port in full duplex mode.

    thanks again.

  201. hi m doin a project on RFID asset tracking its a embedded system. if i connect my RFID reader to the serial port and place my RFID tag on it,instead of showing unique ID it is showing me different hexadecimal value…..how to change the settings

  202. Dilip J, that is a very common issue. You need to buffer the incoming data, then look in the buffer for the data you need. See FAQ Q #14, “Buffering Incoming Data”

  203. I just wanted to say that this is a great article. This not only was pivotal in helping me work through what I am currently trying to do but it has me excited about starting a few pet projects in the coming weeks.

    Great work! You are truly an asset to the community. =)

  204. Just for those who are trying this whit their small devices. The supported baud rates are missing one very important and frequently used baud rate: 19200. The list should be as this:
    this.cmbBaudRate.Items.AddRange(new object[] {
    “300”,
    “600”,
    “1200”,
    “2400”,
    “4800”,
    “9600”,
    “14400”,
    “19200”,
    “28800”,
    “38400”,
    “56000”,
    “115000”});

  205. hi i am using visual studio 2008 .ur source code could open here.show some conversion problem.please help…i am writing a program which is working on DB9 but not working on usb.what is required please help..

  206. # re: SerialPort (RS-232 Serial COM Port) in C# .NET
    Sunday, April 11, 2010 6:19 AM by argha

    hi i am using visual studio 2008 .ur source code could open here.show some conversion problem.please help…i am writing a program which is working on DB9 but not working on usb.what is required please help..

  207. Im having a bit of a problem with this code it should read the device response to the text box but it doesnt work at all for incoming messages.
    When i tried “textbox.appendText(comport.ReadExisting); it works for only 1 time (also tried to use a timer to read again but that didnt worked either)
    im using VS2008 on Win Vista Home premium
    Any idea ? or do u need more code?

    private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
    {
    // This method will be called when there is data waiting in the port’s buffer

    // Read all the data waiting in the buffer
    string data = comport.ReadExisting();

    // Display the text to the user in the terminal
    Log(LogMsgType.Incoming, data);

    }

  208. Hi, Can someone give me a clue why this isn’t working, I’ve tried different handshakes and stuff…

    SerialPort1.Open()
    Dim buffer As String
    buffer = “atdt123”
    MsgBox(“Let’s try now”, , buffer)
    SerialPort1.Write(buffer + “\r\n”)

    PS I’m using VB in VS2010 on Win7 64-bit.

  209. Hi all!
    now im using VS 2008 to write the interface communication between PC and 8051.
    I have problems with sent data from 8051 to PC.
    my project is communication between PC and 8051 (exactly: auto change temperature).
    i want to view the temperature on textbox in windowform use C#.please help me!
    thanks for your help!!!

  210. Hi,

    This is good sample of serial port.

    How could I emulate both sender and receiver at the same time. As we know once a COM is connected by one application, other application is not able to connect to that COM.

    Within same application as this demo, after the application writes data to the port, the datarecieved event is not invoked.

    Thank you for your help

    Hans

  211. Hi,

    Thank you very much for the wonderful program.

    I am currently trying to get a GSM modem to work using your program.

    I am testing this on Windows Vista, using PL2303_Prolific_DriverInstaller_v1210 as the driver from iTegno fails to work for their wm1080a device. (no idea why)

    Configure the ports correctly. Could send out sms with VisualGSM lite (s/w) but failed using VisualGSM Enterprise & ActiveSMS (both could not detect the hardware).

    When I open the port, the CTS and CD / DCD checkboxes get set by the “UpdatePinState()”.

    However, DSR never becomes checked.

    I also do not get any response from the Modem. Any clues?

    Thank you.

    Regards,
    Peon

  212. Hello:

    I would like to send a wave file to modem when someone pick up the phone and the phone play wave file correctly.

    How could I achieve that?

  213. Thanks for the great guide, but I have a question. I have been going through your code line by line to adapt it for my own needs but I cannot figure out where in your code you add the list of values for baudrate.

  214. jcous, the baud rates for the combo box are set during design time. Select the cmbBaudRate ComboBox, look at its Items property, click the “…” and you’ll see the values there. There isn’t an easy programmatic way to retrieve the supported baud rates so I’ve just ‘hard coded’ the most common values in there. You can manually type in another rate to see if it the port will open with a different baud rate.

  215. Hi,

    I read u r article its good.

    I send and save .dat files in my terminal through kermit protocal.
    How can i do it. can u guide me?

  216. Using VS2010 I tried to build the SerialPortTerminal, during conversion there are errors, and it appears that the file “NoahCoad.pfs” is missing
    Also there is the following error message
    “Unable to find manifest signing certificate in the certificate store

    On the positive site ==> your demonstration works like a dream.

    Rob
    info@cccbv.com

  217. Hi,

    I am new to Serial port programming. I have RFID reader & a sensor that transmit info through serial port. When the rfid reader reads rfid hanger & sensor reads an object simultaneously then the sensor will fails to transmit info. Below are my serial port code in c#:

    private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
    {
    StationDATA szCANData;

    //String szData =””;
    int nBytesToRead = serialPort1.BytesToRead;
    byte[] szBuff = new byte[nBytesToRead];
    //string szCOM= serialPort1.ReadExisting();
    //szData += serialPort1.ReadExisting();
    //ProcessBuffer(szData);
    serialPort1.Read(szBuff, 0, nBytesToRead);

    szCANData.StationID = szBuff[0];
    szCANData.StationCMD = szBuff[1];
    szCANData.StationMSG0 = szBuff[2];
    szCANData.StationMSG1 = szBuff[3];
    szCANData.StationMSG2 = szBuff[4];
    szCANData.StationMSG3 = szBuff[5];
    szCANData.StationMSG4 = szBuff[6];
    szCANData.StationMSG5 = szBuff[7];
    szCANData.StationMSG6 = szBuff[8];
    szCANData.StationMSG7 = szBuff[9];
    szCANData.EOD = szBuff[10];

    }

    Please advice. Many thanks

  218. Error Unable to find manifest signing certificate in the certificate store.
    i’m getting this error while running the application..how to correct this?

  219. Hi,

    I am doing my final year project now.
    I am using the MSP430 eZ430-RF2500 from Texas Instrument,
    and I have to communicate with this device, take the data, and display in C#

    May I know how to do it?
    Thank you.

  220. Hi,
    Thank you so much for this article.

    I have a web application and would like to get data (a number) from a OCR scanner through the serial COM port on a defined computer in the network to a textbox in my application. Im not sure how to connect to and read that serial COM port

  221. hi,
    this is a wonderful article

    but why when i run it after copy pasting, there are newlines

    e.g.

    i write:

    bbbbbbbbbbbbbbbbbbbbbbb

    i read on the other pc:

    bbbbbbb
    bbbbbbbbbbbbbbbbb
    bbb

    i can understand where these newlines came from

    thanks for any respond

  222. Hi,

    Thanks for this wonderful article, I have small doubt like can we store the data which we receive from the COM ports in a SQL server database if so can you give me some kind of suggestion. mail id is srinivasasubbanna@yahoo.com

    Regards,
    Srinivasa

  223. I have written a good and complete implementation of a terminal program which establishes a communication with a serial device of our company. It works fine BUT for the following issue.
    On certain computers (not mine!) it “”almost” never works the first time you start it. It behaves as if the port has been opened, goes through a number of check points, send the first string to the target device, then does nothing. There are quite a number of safety controls. E.g. : if you open an existing port and there is no device attached this condition will be detected. If you try open a busy com port the condition will be detected. Etc. Another point is that once the application is running (stopped by the abnormality) the port does appear as occupied, no other application can connect to it. So everythin looks fine but nothing is working!
    When this happens you just have to close and restart the application, and this will always work.
    The serial port, of course, is a USB-RS232 device (Silabs), not a true port.
    The worst thing is that my computer never has this problem!
    The customers … yes ( not all of them!).
    Thanks if anybody has some idea to share.

  224. I try your example and I was made similary program. When I start your or my program and send something to the serial port on my laptop immediately dataRecieved was triggered. This is not case on COM1 on desktop example. Do you know why?

    Second question. Serial port have methods DiscardInBuffer() and DiscardOutBuffer(). Is buffer for reading and writing is the same space? If you have some good link, please post it.

    Thanks!

  225. Hi there!

    First of all, thanks for this wonderful piece of code! It has helped me a lot in understanding the serial port with C#.

    I am working on an External Modem and I need to dial out to a number and make a voice call from my modem. I have figured out all the “AT” commands with a hyper terminal. My question is how do I modify this code to make it work with my external modem. Right now, if I type ATI and send the data, I see the ATI in green. In my hyper-terminal I get an OK response. Please let me know what needs to be done or even point me at the direction which will help me over come this issue.

    Thanks again for your wonderful work!

  226. Hi All,

    I have managed to use the serial communication application in microsoft visual studio C# for ez430-rf2500
    Next, I am supposed to display the temperature data in x-y graph.

    Do you have any idea about how to do it?

    I have tried to use substring method, as well as split method, to get the temperature data before plot it in x-y graph.

    However, the output is very messy, and i dont think i can use those methods.

    Really appreciate your help on this. Thank you.

  227. Hello,
    I made an application in vb.net 2008, I have 4 windows that use the com1 port to connect with a balance “EXA” I used your code C # it works well.
    here is my own code VBNET:
    I instantiated a serialport in module like this:
    Public vReciever As String = Nothing
    Public port As New SerialPort
    Public Delegate Sub myDelegate ()

    after I wrote in each window that uses the balance this code:
    —————————————————————————-
    Private Sub btn_CapturerPoids_Click (ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_CapturerPoids.Click
    RemoveHandler port.DataReceived, AddressOf procedure_DataReceive
    AddHandler port.DataReceived, AddressOf procedure_DataReceive
    port.Close ()
    Try
    With port
    . PortName = “COM1”
    . BaudRate = 9600
    . IO.Ports.Parity.None Parity =
    . DataBits = 8
    . StopBits = IO.Ports.StopBits.One
    End With
    port.Open ()
    port.Write (“$”)
    Catch ex As Exception
    MessageBoxEx.Show (ex.Message)
    Finally

    End Try
    End Sub
    —————————————————————————-
    Public Sub procedure_DataReceive (ByVal sender As System.Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs)
    Try
    lblPoids.Invoke (New myDelegate(AddressOf updateTextBox), New Object () {})
    Catch ex As Exception
    MessageBoxEx.Show (ex.Message)
    End Try
    End Sub
    —————————————————————————-
    Public Sub updateTextBox ()
    vReciever = Nothing
    vReciever = port.ReadExisting
    With lblPoids
    . Font = New Font (“Garamond”, 30.0 “, FontStyle.Bold)
    . ForeColor = Color.Red
    If vReciever.Contains (“A”) = True Then
    lblPoids.Text=vReciever.Replace (“A”, “”).Replace( “.”). Replace(“STX”, “”).ToString
    Else
    lblPoids.Text = 0.0
    End If

    End With
    RemoveHandler port.DataReceived, AddressOf procedure_DataReceive

    End Sub
    —————————————————————————-
    the problem is that
    1-sometimes the application does not receive the value after two or three clicks.
    2 – the application does not display value if the the counter of balance is not yet stable
    3-meter if the balance is stable sometimes receives the true value, and sometimes receives only a portion of the value {A 2.50 => (A 2) and (50)} value is unscrewed in two parts .

    knowing that the application works fine in some computers and others not.

    thank you for responding.

  228. hi every one…
    i’m trying to receive some data from RS-232, and i wanna make sth like windows task manager graph which shows CPU activity in a grid and as U see that graph is moving by time…. i wanna make sth like that… i’m really confused! plz help me where to start….

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  233. Hello ,
    I have read your article , it was useful , but i have a problem .
    with testing your application in c# , there was no error in receiving data , but i want to get data in serial port in c++ correctly.my program in c++ receive serial data and save them in a buffer , but after some minutes , some data loose , and there is no tools such as delegate in there for buffering data , which solution do you suggest?
    thanks in advance ,
    best regards ,
    zahra babaei

  234. Hi All,
    I am facing problem reading data from Serial port. Actually I am connecting with the hardware device called Crimp Force Analyzer. It gives the data on hyperterminal and I have to read that data from my vb.net program. The data is somewhat like this:
    18:49 29/01/2011,79,1,11.26,0,50,Pass.

    I think this data is on serial port and I m trying to read it from there.
    Can anybody help me out with this? Its urgent.

    Thanks in advance.

  235. Hi Guys,
    I’m sending a file’s data line by line from PC1 to PC2 via COM port null cable. There is huge data in the file.

    When I find particular keyword received in PC2 the, I send some data to PC1 via COM port.

    I’m facing the issue to stop the sending of data from PC1 when I receive particular data from PC2.

    Any help will be appreciated.

    Thanks,
    Harry

  236. Dear Coad:

    When I download the source code and deploy the project, it is OK.
    When I tried to install the deployed project, it always failed with the following error message:

    Fail to download the required file “SerialPort_Terminal.exe.config.deploy”

    I check the files in Application Files\SerialPort_Terminal_1_0_0_8,
    and failed to find the required file “SerialPort_Terminal.exe.config.deploy”.
    There are seven files in the output directory:
    App.config.deploy, App.ico.deploy, Notes.txt.deploy, SerialPort_Terminal.application, SerialPort_Terminal.exe.deploy,
    SerialPort_Terminal.exe.manifest, SerialPort_Terminal.pdb.deploy

    I visit your web in
    http://coad.net/blog/resources/clickonce/SerialPortTerminal/Application%20Files/SerialPort%20Terminal_1_0_0_8/

    I find that there is a hyperlink for File “SerialPort Terminal.exe.config.deploy”.
    There are totally eight output files.

    Can you tell me if there was something missing in your source code?
    Is there any configuration file missing during the building of this project?

    Best Regards

    DL Jeng

  237. I am trying to install from this website but the installer can’t run. My C:\ is partitioned as system only, and I use D:\ for programs. XP SP3 all new hardware.

  238. Hi All,

    We have an application that reads the badge with serail port control.Barge is not reading fully for the “(%4 )M ” value.
    sample badge : (%æSTXòX(contains 7 chars)
    Following code reads the badge:
    bytes = MSComm1.BytesToRead
    ‘create a byte array to hold the awaiting data
    Dim bytearray As Byte() = New Byte(bytes – 1) {}
    MSComm1.Read(bytearray, 0, bytearray.Length)
    strTemp = System.Text.ASCIIEncoding.Default.GetString(bytearray)

    Can any one plz explain why the serial port is not reading for the “(%4 )M barge?

  239. I need to clear the characters are in the buffer every time you open the program.

    Awaiting your help.
    Bruno / Brazil

  240. for PFX fix: go to the project properties->signing-> Click on create Test Certificate.. thats it the project creates a new certificate.. njoy lol

  241. I want to send a command “0x02 0x01 0x02 0x03” to a device via RS-232.
    This is a 4 byte command:

    1. Byte STX: 0x02
    2. Byte ID: 0x01 ~ 0xFF
    3. Byte command: 0x01, 0x02, 0x03
    4. Byte EXT: 0x03

    any idea how to use serial port terminal to operate?

  242. Thanks for this code. I have a TUSB3410 serial port that shows up in device manager as COM15. However, it is not listed in devicemap/serialcomm It does show up under enum/usb in the currentcontrolset Do you have any idea why it is not showing up in the devicemap?

  243. Excellent Article.

    We have faced a lot of issues in sending data to the RS232 devices in Hex format. There are many Emulators which can show the output in HEX format , but all of them send data in ASCII format only. Finally we have identified this post and solved our issue very simply

  244. Hi Coad:
      How do real-time updates SerialPort name to comboBOx.
      ex:COM2 delete in the Device Manager, then comboBox Items COM2 options delete. Or COM3 add in the Device Manager, Then comboBox Items add COM3 options.

      Thank a lot~~

  245. Dear all,

    I bought a “Bluetooth Wireless Serial Port Adapter” (http://www.wcscnet.com/HdwBTRS232.htm)HDWBTRS232″ to replace the cable. It is work in HyperTerminal, that mean HyperTerminal can show the message from the device, but it is not work in my developed program. My program cannot receive any message from the device. My program is work when using cable connection and it is developed using VB.Net.

    Do you have and ideas / advices about this problem ?

    Regards,
    Gary Sham

  246. Hello , It is a very informative and nice article . I would like to appreciate your efforts . I got following error when i tried to run your code:
    “Unable to read the project file ‘SerialPortTerminal.csproj’.”….

    I am using vs2008 …. Please help me i have to develop a software to connect Weighing bridge with rs232 port…..

    Regards,
    Vineet

  247. Hi,
    I’m using your program to communicate with a device at 300 baud. I have added the 300 in the “cmbBaudRate” and I send the command at 300 baud, but the answer is incorrect. Why? Are there any problems with 300 baud communication in C# .NET 2010? Must I change something in the reading routine?
    The program works properly at 9600 baud.

    Thanks in advance,
    Gerardo

  248. Hi guys, please advised.
    How do i do the ProcessBuffer method? Is it as follows?

    private void ProcessBuffer(List bBuffer)
    {
    // Look in the byte array for useful information
    // then remove the useful data from the buffer

    byte [] buffer = bBuffer.ToArray();

    for (int i = 0; i < buffer.Length ; i++) { textBox1.Text = bBuffer[i].ToString(); } } Ty.

  249. My app need to interface with several microchip readers, and each reader has different transfer rates and not always is documented.

    So, it could be nice if we could somehow “test” the device to automagically set the bauds for the user. Most users don’t have any clue of what BAUDS are or where to find the Transfer Rate.

    This is somehow possible?

    Thanks!

  250. I have a uC and it sends 40bytes of data.
    I can see the data all the bytes being displayed(40 bytes).
    But when I try to get the string length its returns ’24’ instead of 40. Is there away I could access each individual byte?
    ie. byte[1], byte[2]…byte[40]?

    Thanks,
    Clint

  251. plssss can any one tell how to connect Rs-232 to visual basic 2008, i am tired of do all types of circus but not able to connect, i have an application i need to communicate this app through Rs-232 or any serial, can any 1 explain in deatail n step by step how to communicate….i am having a tough time in office..:-(

  252. Hi. I need help on receiving data from a microcontroller. The pic 18f1220 sends a data constantly in a format of ‘BPabc’ wherein the ‘BP’ is just an indicator; and the ‘a’,’ b’, and ‘c’ are variable values which should all be converted to utf32 in the csharp program. BTW, i stored the received data in a string variable. When the utf32 equivalents of ‘a’, ‘b’ and ‘c’ are low (example: 91), there is no error. But, when the utf32 equivalents are high (example: 200) the serial port reads ‘?’ which has an equivalent of 63. I’m pretty sure that the problem is not with my microcontroller because when i tried to retrieve the values received in the serial port using the Hyperterminal, the values received are as expected. I’m also sure about my conversion. Is it possible that the problem is with the Serial port controller of Visual Studio 2010? What can you suggest? thank you!

  253. hi! i would just like to inform that i’ve already solved the problem i just posted. it was regarding the ascii encoding. since 8 bits was not supported, i changed the encoding to extended ascii and it worked.
    change the port encoding to:
    System.Text.Encoding.GetEncoding(1252);
    or
    System.Text.Encoding.GetEncoding(28591);
    🙂

  254. Any chance of getting a Visual Studio 2005 version of the code? I was elated to find this, but the lambda expressions won’t compile in VS 2005:

    private void UpdatePinState()
    {
    this.Invoke(new ThreadStart(() => {

    private void RefreshComPortList()
    {
    // Determain if the list of com port names has changed since last checked
    string selected = RefreshComPortList(cmbPortName.Items.Cast(), cmbPortName.SelectedItem as string, comport.IsOpen);

    // Order the serial port names in numberic order (if possible)
    return SerialPort.GetPortNames().OrderBy(a => a.Length > 3 && int.TryParse(a.Substring(3), out num) ? num : 0).ToArray();

    // Find newest port if one or more were added
    string newest = SerialPort.GetPortNames().Except(PreviousPortNames).OrderBy(a => a).LastOrDefault();

    I’m mostly a C++ programmer, but I wanted to do a project in C# that included a GUI. Unfortunately, I haven’t had time to make sense of lambda expressions. I think I can recode the first one, but I have no idea on the last two. Besides the lambdas, the cast had the following error:
    Error 1 ‘System.Windows.Forms.ComboBox.ObjectCollection’ does not contain a definition for ‘Cast’ D:\My Documents\Visual Studio 2005\Projects\SerialPortTerminal\Terminal.cs 385 59 SerialPortTerminal

  255. I am Trying to Read Data from Mettlor Toledo Weighbrid Data, i tried code given to this website, but its giving me data in ??0?033? format but actual Data was displayed on Weighbride LCD was 33340

    I m new to Serial Programming Please Suggest wat to do.

  256. Hi,

    First time i am using SerialPort class. This article helped me alot.Thank you very much.

    I have one prob, i.e.. i need to send one byte data with parity having value 1(Mark) and one byte data with parity value 0(space). ideally the code should like this

    SerialPort _serialport1 = new SerialPort(strCOMPort, 9600, Parity.Mark, 8, StopBits.One);
    _serialport1.Open();
    _serialport1.Write(bytedata);
    _serialport1.Parity=Parity.Space;
    _serialport1.Write(bytedata);

    is there any way to set parity twice. its very urgent..thanks in advance for ur help

  257. Almost nothing in PC interfacing is more complicated than selecting the right RS232 sequential wire. These pages are intended to provide information about the most common sequential RS232 cords in normal PC use.The RS232 plug was initially developed to use 25 hooks. In this DB25 plug pinout conditions were made for another sequential RS232 interaction route.

  258. I try to receive data from a machine with(1st doubt) two options USB/RS232 where baud rate can be set only in USB option.
    Drivers installed(prolific),parity,stream(xon,hardware…),etc… set both through the application and manually,machine sending data(at least thats the message),serial port opened without error,different buffer sizes,readtimeout,etc but……..no bytes to read,no datareceived event,no nothing.

    Anyway,Mr,one of the greatest jobs that can be found about serial-usb communication

  259. It became quite well-known and is (currently) the top Look for for “serial c#”. Now each weeks time I get several e-mails with individuals asking concerns and it is about here we are at some serious upgrading.The content was (originally) published soon after .NET was presented to the community, and other .NET sequential slot manages had not yet been published. So at time, this was an simple remedy. Just use the MSComm.ocx management from VS6 which most Devs had at time. Now however, there are many simpler and recommended techniques than interacting with the reasons of interoping with an old history (non-.NET) ActiveX OCX management.

  260. The pic 18f1220 sends a data constantly in a format of ‘BPabc’ wherein the ‘BP’ is just an indicator; and the ‘a’,’ b’, and ‘c’ are variable values which should all be converted to utf32 in the csharp program. BTW, i stored the received data in a string variable. When the utf32 equivalents of ‘a’, ‘b’ and ‘c’ are low (example: 91), there is no error.

  261. did you use the serialport in c# 2010? when I use 2008, serialport worked very nice, but I can’t use in c#2010

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