Read data from GSM modem

[ghjk]

I'm write code to read data from GSM modem. but it couldn't read modem response. Could you please help me? I'll post my code.
[PHP]using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.IO.Ports ;
using System.Threadin g;
using System.Timers;
using System.Diagnost ics;

namespace rainfall
{
public partial class Form1 : Form
{
//create an Serial Port object
SerialPort sp = new SerialPort();

public Form1()
{
InitializeCompo nent();
}

private void Form1_Load(obje ct sender, EventArgs e)
{

}

private void btn_Start_Click (object sender, EventArgs e)
{
sp.BaudRate = 19200;
sp.ReceivedByte sThreshold = 1;


try
{
//Open serial port
sp.PortName = "COM1";
sp.Open();

}
catch (System.Excepti on ex)
{
lblError.Text = ex.Message;
}
}

private void btn_Write_Click (object sender, EventArgs e)
{
try
{
//Write line to serial port
//sp.Write(texSms .Text + "\r\n");
sp.Write(txt_Sm s.Text + "\r\n");
//texSms.Text = "";
txt_Sms.Text = "";
}
catch (System.Excepti on ex)
{
lblError.Text = ex.Message;
}
//Thread.Sleep(20 0);
//Set time delay
//System.Threadin g.Thread.Sleep( 30);
//sp.WriteTimeout = 200;
}

private void btn_Read_Click( object sender, EventArgs e)
{
try
{
//Cler text box
//Read serial port and displayed the data in text box
Thread current = Thread.CurrentT hread;
Thread.Sleep(10 00);
txt_Sms.Text = sp.ReadExisting ();
//texSms.Text = sp.ReadExisting ();
sp.Write("Conne cted" + "\nS");

}
catch (System.Excepti on ex)
{
lblError.Text = ex.Message;
}
}
}
}[/PHP]

[nmsreddi]

Hi

the code what you have written is almost correct, make sure that the baud rate you are using matches with the modem you are using .

are you able to get response from hyperterminal which proves that your modem is working fine .

as far as code is considered what you have used is correct ,better check other things connection cable and your hardware.


Regards
nmsreddi