C# 串口通信

打开串口

SerialPort port = new SerialPort();
public void OpenSerialPort()
{
    port.BaudRate =Convert.ToInt32(SettingsModel.rs232_rate);//波特率
    port.PortName = SettingsModel.com;
    port.Parity = Parity.None;//校验法：无
    port.DataBits = Convert.ToInt32(SettingsModel.data_bits);//数据位：8
    port.StopBits = StopBits.One;//停止位：1
    try
    {
        if (!port.IsOpen)
        {
            port.Open();
            lab_scan_result.Text += "\n"+"串口"+port.PortName+"已打开";
        }
        port.DataReceived += new SerialDataReceivedEventHandler(DataReceived);
    }
    catch (Exception ex)
    {
        //打开串口出错，显示错误信息
        lab_scan_result.Text+=ex.Message;
    }
}

接收回调

private void DataReceived(object sender, SerialDataReceivedEventArgs e)
{
      byte[] buffer = new byte[port.BytesToRead];
      int length = port.Read(buffer, 0, buffer.Length);
      string str = System.Text.Encoding.Default.GetString(buffer, 0, length);
      if (length>0) {
          m_SyncContext.Post(SetTextSafePost, str);
          if (lab_scan_result.TextLength > 1024 * 1024)
          {
              lab_scan_result.Text = "执行过程：";
          }
      }
  }

发送数据

public void Send_Data() {
   port.Write("123");    
}

关闭串口

public void closedSerialPort()
{
     port.Close();
     lab_scan_result.Text += "\n"+"串口已断开";
 }