using System.IO.Ports;  
  
SerialPort serialPort = new SerialPort();  
serialPort.PortName = "COM1"; // 串行端口名稱  
serialPort.BaudRate = 9600; // 波特率  
serialPort.DataBits = 8; // 數(shù)據(jù)位  
serialPort.Parity = Parity.None; // 校驗位  
serialPort.StopBits = StopBits.One; // 停止位  
serialPort.Handshake = Handshake.None; // 控制協(xié)議

serialPort.Open();  
// ... 執(zhí)行串行通信操作 ...  
serialPort.Close(); // 完成后關(guān)閉串行端口

// 寫入數(shù)據(jù)  
serialPort.WriteLine("Hello, serial port!");  
  
// 讀取數(shù)據(jù)  
string data = serialPort.ReadLine(); // 讀取一行數(shù)據(jù)，直到遇到換行符  
// 或者  
string existingData = serialPort.ReadExisting(); // 讀取所有可用數(shù)據(jù)

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

try  
{  
    serialPort.Open();  
    // ... 串行通信操作 ...  
}  
catch (Exception ex)  
{  
    Console.WriteLine("Error: " + ex.Message);  
}  
finally  
{  
    if (serialPort.IsOpen)  
    {  
        serialPort.Close();  
    }  
}