COM Example

using System;
using System.IO.Ports;

class PortDataReceived
{
    public static void Main ()
    {
        SerialPort mySerialPort = new SerialPort ("COM8");

        mySerialPort.BaudRate = 9600;
        mySerialPort.Parity = Parity.None;
        mySerialPort.StopBits = StopBits.One;
        mySerialPort.DataBits = 8;
        mySerialPort.Handshake = Handshake.None;
        mySerialPort.RtsEnable = true;

        mySerialPort.DataReceived += new SerialDataReceivedEventHandler (DataReceivedHandler);

        mySerialPort.Open ();

        string message;
        StringComparer stringComparer = StringComparer.OrdinalIgnoreCase;

        while (true) {
            message = Console.ReadLine ();

            if (stringComparer.Equals ("quit", message)) {
                break;
            } else {
                mySerialPort.WriteLine (message);
//              Console.Write (mySerialPort.ReadExisting());
            }
        }

        Console.WriteLine ("Press any key to continue...");
        Console.WriteLine ();
        Console.ReadKey ();
        mySerialPort.Close ();
    }

    private static void DataReceivedHandler (
        object sender,
        SerialDataReceivedEventArgs e)
    {
        SerialPort sp = (SerialPort)sender;
        string indata = sp.ReadExisting ();
        Console.WriteLine ("Data Received:");
        Console.Write (indata);
    }
}