Чтение последовательного порта в C#

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Привет,

I am trying to talk to an Aglient device via C# through a RS232 connection on my PC with XP OS and I am having trouble. I can send a command, such has a query (*IDN?), and I never get a response in my GUI. However, if I open hyperterminal the device IDN shows up in hyperterminal like it should have showed up in my GUI. From my C# GUI, I can sent a cammand to the device to change voltage level and the device changes voltage level as I can see it on the device display. However, when I send a query to the device, I expect to see data in the input buffer that was sent by the device, but the input buffer is always empty. I have connect more than one device and I have yet to read any data from the input buffer. I can write to the output buffer and read the correct reponse from the input buffer using hyperterminal and Labview. I can send the query via my C# GUI and read the correct response from the input buffer using hyperterminal and Labview. Is there a bug when reading the input buffer using C#?

Что я уже пробовал:

это мой код.:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        // Set the COM1 serial port to speed = 4800 baud, parity = odd,
        // data bits = 8, stop bits = 1.
        SerialPort port = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);

        public Form1()
        {
            InitializeComponent();
            this.sendRead.Text = "Enter Commands or queries here";

            // set read time out to 2 seconds
            port.ReadTimeout = 2000;

            // open serial port
            port.Open();

            //Enable Event Handler
            port.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);
        }

        private void sendRead_TextChanged(object sender, EventArgs e)
        {
        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                //write line to serial port
                port.WriteLine(sendRead.Text);

                //clear the text box
                sendRead.Text = "";
            }

            catch (System.Exception ex)
            {
                sendRead.Text = ex.Message;
            }
        }

        private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            int intBuffer;
            intBuffer = port.BytesToRead;
            byte[] byteBuffer = new byte[intBuffer];
            port.Read(byteBuffer, 0, intBuffer);
            this.Invoke(new EventHandler(DoUpDate));
        }

        private void DoUpDate(object s, EventArgs e)
        {
            sendRead.Text = port.ReadLine();
        }

        private void Form1_FromClosing(object sender, EventArgs e)
        {
            port.Close();
        }
    }
}

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