如何使用 C# 表单应用程序将十六进制字符发送到串口？

Question

I want to send the hex over the COM port. I have prepared code manually, but its for string sending.

This is how application looks like currently:

I need to read data from textbox and then send in hex format to COM port.
Currently I am handling the button click with the following sending code, however currently it is sending hard coded values, but I need ones taken from text field.

private void btnSendData_Click(object sender, EventArgs e) {
 if (serialPort1.IsOpen) { 
     dataOUT = tBoxDataOut.Text;
     if (sendWith == "WriteLine") { 
        serialPort1.WriteLine(dataOUT);
     } else if (sendWith == "Write") {
        serialPort1.Write(dataOUT);
     }
  }
}

Answer 1

You can read about Standard Numeric Format Strings here . Read the section "The Hexadecimal ("X") Format Specifier".

private void btnSendData_Click(object sender, EventArgs e)
{
    if (serialPort1.IsOpen)
    {
        //dataOUT = tBoxDataOut.Text;
        int intVal = Int32.Parse(tBoxDataOut.Text);
        dataOUT = intVal.ToString("X");
        if (sendWith == "WriteLine")
        {
            serialPort1.WriteLine(dataOUT);
        }
        else if (sendWith == "Write")
        {
            serialPort1.Write(dataOUT);
        }
    }
}

I would like to include a simple, working example. I do not have a COM port, but the com0com virtual driver works fine for this demonstration; you can download it here . I also used Putty to display the ports' received data; you can download it here .

Here's my program:

public class HexConvert
{
    SerialPort mySerialPort;

    public HexConvert()
    {
        InitPort();
    }

    void InitPort()
    {
        mySerialPort = new SerialPort("COM1");

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

    public void SendMessage()
    {
        try
        {
            string s = "15"; // "F" In Hexadecimal
            int x = Int32.Parse(s);
            string s2 = x.ToString("X");

            if(!mySerialPort.IsOpen)
                mySerialPort.Open();

            mySerialPort.WriteLine(s2);

            mySerialPort.Close();
        }
        catch(Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }
}

Here's my com0com utility's Configuration (I added the COM1 and COM2 pair; no other actions taken in this emulator):

Here is my Putty Configuration (Note that I used COM1 in the program, and COM2 in Putty):

And, finally, here is the output that my demo app produces:

Answer 2

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enter image description here i.stack.imgur.com/LfKM5.png