Uno serial relay between GPRS shield and PC

Projects Programming
1

I'm using the Quectel M10 GPRS shield on Uno. I want to send AT commands from my PC. Below example shows how to use the SoftwareSerial library to create a serial link between computer and the GPRS modem.

//Serial Relay - Arduino will patch a
//serial link between the computer and the GPRS Shield
//at 19200 bps 8-N-1
//Computer is connected to Hardware UART
//GPRS Shield is connected to the Software UART

#include <SoftwareSerial.h>

SoftwareSerial mySerial(2,3);

void setup()
{
mySerial.begin(19200); // the GPRS baud rate
Serial.begin(19200); // the GPRS baud rate
}

void loop()
{
if (mySerial.available())
Serial.write(mySerial.read());
if (Serial.available())
mySerial.write(Serial.read());

}

When I try above, I dont see anything back from the GPRS shield.

If I change this,
SoftwareSerial mySerial(2,3);

I could see that AT command is sent, but i'm not getting any response. I've just started using Arduino. Any help is appreciated.

2

If I change this,

To what?

3

If I change this,
SoftwareSerial mySerial(2,3);

to
SoftwareSerial mySerial(0,x);

'x' could be any value..

I could see that AT command is sent, but i'm not getting any response. I've just started using Arduino. Any help is appreciated.

4

I could see that AT command is sent

By what? Nothing happens magically.

If you change the SoftwareSerial instance to read the hardware serial pins, you'll get EXACTLY the same data as the Serial instance does.

What is sending the AT commands? How is the GPRS connected to the Arduino?

5

Hi Paul,
Thanks for your response..

What is sending the AT commands? How is the GPRS connected to the Arduino?

I'm using the M10 GPRS shield (http://arduino.cc/en/Main/ArduinoGSMShield) that connects to the Arduino Uno board as below,

I'm using the online AT command test tool (http://m2msupport.net/m2msupport/module-tester) to send AT commands.