Read from COM port in C#

Question

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How to READ and Write from the Serial Port in C#

How do I read data from a COM port in C #? More specifically, I need to read data of variable length. If possible please provide an example. Thanks in advance

Could you please give more details on what you are trying to do? How is the data being sent to you etc... — msarchet, Aug 28 '11 at 19:31
Have you searched through this site? This question has come up _many_ times. See [here](http://stackoverflow.com/search?q=%5Bc%23%5D+com+port). — Oded, Aug 28 '11 at 19:32

score 1 · Answer 1 · edited Jan 06 '16 at 08:59

You need to use the System.IO.Ports.SerialPort class or the System.IO.Ports namespace.

There are some examples and more information on this page.

Here is an example:

    // 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(); }

This appears to show how to write, while the question asks how to read — Mawg says reinstate Monica, Nov 18 '16 at 11:29

Read from COM port in C#

1 Answers1