RS232 serial port communication c# win7 .net framework 3.5 sp1

Question

HI im new in c# serial port. im writing a c# program running is winXP and win7 to keep received data from the serial port when the machine was sent data.

using System.IO;
using System.IO.Ports;
using System.Threading;


namespace RS232RVR
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        SettingRS232();
    }

    public void SettingRS232 ()
    {
        try
        {
            SerialPort mySerialPort = new SerialPort("COM6");

            mySerialPort.BaudRate = 9600;
            mySerialPort.Parity = Parity.None;
            mySerialPort.StopBits = StopBits.One;
            mySerialPort.DataBits = 8;
            mySerialPort.Handshake = Handshake.None; //send to hardware flow control.

            mySerialPort.DataReceived += new SerialDataReceivedEventHandler(DataReceviedHandler);

            mySerialPort.Open();


            richTextBox1.Text = "on";

            mySerialPort.Close();
        }
        catch (Exception ex)
        {
            richTextBox1.Text = ex.Message;    
        }

    }

    private void DataReceviedHandler(
                    object sender,
                    SerialDataReceivedEventArgs e)
    {
        SerialPort sp = (SerialPort)sender;
        string indata = sp.ReadExisting();
        richTextBox1.Text = indata;

    }

}

}

COM6 is active in my pc. but my problem was seem the datareceived event is not fire when it has data coming from the serial port. ( i had checked the sport by using some of the freeware application)

anyone can help?

thanks

Answer 1

        mySerialPort.Open();
        richTextBox1.Text = "on";
        mySerialPort.Close();

That's not going to work, you'll close the serial port a couple of microseconds after opening it. Yes, the DataReceived event handler is not likely to fire. Only close the port when shutting down your program.

        mySerialPort.Handshake = Handshake.None

That's a problem too, you'll need to control the handshake signals yourself now. The vast majority of serial port devices won't send anything until they see the machine powered up and ready to receive. Set the DtrEnabled and RtsEnabled properties to true.

Answer 2

Did you copy that code from your application? Is it perhaps just a case that the event handler name is misspelled? E.g. DataReceviedHandler should actually be spelt DataReceivedHandler.