串行端口写入和读取事件未订阅/未读取串行端口

Question

我一直在尝试使用串行端口COM4发送和读取命令，该端口已经使用此代码进行了配置，它连接到一个纸币接收器设备

我正在使用一个事件来暂停无论何时设备发送答案然而，当我发现它从来没有真正到达事件或订阅它，我已经阅读了整整一周如何解决这个问题，但没有运气。

即使我碰巧将“读端口”行放在“写端口行”之后，并且程序到达

 ptSerial.Read(RxMensaje, 0, 5);

我必须停止这个程序，希望这里有人能帮我。

public partial class Form1 : Form
{
  public SerialDataReceivedEventHandler DataReceivedDelegate;


    public Form1()
    {
        InitializeComponent();
    }

    private  void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
    {
        DataReceivedDelegate = new SerialDataReceivedEventHandler(DataReceivedHandler);
        //SerialPort sp = (SerialPort)sender;
        //string indata = sp.ReadExisting();

        byte[] RxMensaje = new byte[5];
        ptSerial.Read(RxMensaje, 0, 5);
        rtbDevice.Text = Encoding.ASCII.GetString(RxMensaje, 0, 5);

      //  rtbDevice.Text = indata;
    }

    private void btnOpen_Click(object sender, EventArgs e)
    {
        try
        {
            Open(sender, e);
        }
        catch (Exception ex)
        {
            lblSalida.Text = ex.Message;
        }
    }

    private void Open(object sender, EventArgs e)
    {
        ptSerial.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
        ptSerial.Open();
        lblSalida.Text = "Puerto COM4 Abierto";
    }

   private void btnSend_Click(object sender, EventArgs e)
    {
        if (ptSerial.IsOpen)
        {
            byte[] TxMensaje = new byte[5] { 0x02, 0x00, 0x01, 0xFE, 0xFF }; //CCtalk  
            ptSerial.Write(TxMensaje, 0, 5);

            rtbHost.Text = "2 0 1 254 255 Enviado";

            //byte[] RxMensaje = new byte[5];
            //ptSerial.Read(RxMensaje, 0, 5);
            //rtbDevice.Text = Encoding.ASCII.GetString(RxMensaje, 0, 5);


            ptSerial.Close();
            lblSalida.Text = "Bytes Enviados Pto Cerrado";
        }
        else
        {
            lblSalida.Text = "Puerto Cerrado";
        }
    }

    private void btnCerrar_Click(object sender, EventArgs e)
    {
        if (ptSerial.IsOpen)
        {
            ptSerial.Close();
            lblSalida.Text = "Puerto COM4 Cerrado";
        }
        else
        {
            lblSalida.Text = "No ocurrio nada :(";
        }
    }
}

Answer 1

我没有看到串行端口的完整定义(例如，在哪里绑定到"COM4")。非常重要的是要正确设置波特率，否则设备将无法与您的应用程序正确同步，也不会产生任何事件。

请参阅http://msdn.microsoft.com/en-us/library/system.io.ports.serialport(v=vs.110).aspx

_serialPort = new SerialPort(); // Allow the user to set the appropriate properties.
_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);