同一臺機只能有一個程式開啟串列埠，自發自收的串列埠資料，可以將串列埠的2、3針腳短接，然後再對串列埠寫資料，同時再讀串列埠即可，讀寫串列埠可參看MSDN，system.io.ports.serialport的C#程式碼

publicstaticvoidMain()

{

stringname;

stringmessage;

StringComparerstringComparer=StringComparer.OrdinalIgnoreCase;

ThreadreadThread=newThread(Read);

//CreateanewSerialPortobjectwithdefaultsettings.

_serialPort=newSerialPort();

//Allowtheusertosettheappropriateproperties.

_serialPort.PortName=SetPortName(_serialPort.PortName);

_serialPort.BaudRate=SetPortBaudRate(_serialPort.BaudRate);

_serialPort.Parity=SetPortParity(_serialPort.Parity);

_serialPort.DataBits=SetPortDataBits(_serialPort.DataBits);

_serialPort.StopBits=SetPortStopBits(_serialPort.StopBits);

_serialPort.Handshake=SetPortHandshake(_serialPort.Handshake);

//Settheread/writetimeouts

_serialPort.ReadTimeout=500;

_serialPort.WriteTimeout=500;

_serialPort.Open();

_continue=true;

readThread.Start();

Console.Write("Name:");

name=Console.ReadLine();

Console.WriteLine("TypeQUITtoexit");

while(_continue)

{

message=Console.ReadLine();

if(stringComparer.Equals("quit",message))

{

_continue=false;

}

else

{

_serialPort.WriteLine(

String.Format("<{0}>:{1}",name,message));

}

}

readThread.Join();

_serialPort.Close();

}

publicstaticvoidRead()

{

while(_continue)

{

try

{

stringmessage=_serialPort.ReadLine();

Console.WriteLine(message);

}

catch(TimeoutException){}

}

}