How send a request to device?

Hi!

I have device IVTM-7N [1] and Arduino Duemilanove
How send a request from Arduino to device?

Request example: $ 0001 RR 0000 04 AD 0D
[Addr] = 0001, [Cmd] = RR, [DataAddr] = 0000, [DataLen] = 04, [ch] = AD

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Code:

#include <NewSoftSerial.h> //Include the NewSoftSerial library to send serial commands to the cellular module.
#include <string.h> //Used for string manipulations

char incoming_char=0; //Will hold the incoming character from the Serial Port.

NewSoftSerial cell(2,3); //Create a 'fake' serial port. Pin 2 is the Rx pin, pin 3 is the Tx pin.

void setup()
{
//Initialize serial ports for communication.
Serial.begin(9600);
cell.begin(9600);

//Let's get started!
Serial.println("Starting...");
delay(500); // give the module some thinking time
cell.println("$ 0001 RR 0000 04 AD 0D");
delay(500); // give the module some thinking time
cell.println("$ 0001 RR 0000 04 AD 0D");
}

void loop() {
//If a character comes in from the cellular module...
if(cell.available() >0)
{
incoming_char=cell.read(); //Get the character from the cellular serial port.
Serial.print(incoming_char); //Print the incoming character to the terminal.
}
//If a character is coming from the terminal to the Arduino...
if(Serial.available() >0)
{
incoming_char=Serial.read(); //Get the character coming from the terminal
cell.print(incoming_char); //Send the character to the cellular module.
}
}

This is not work(
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[1] http://translate.google.ru/translate?js=n&prev=_t&hl=ru&ie=UTF-8&layout=2&eotf=1&sl=ru&tl=en&u=http%3A%2F%2Fwww.eksis.ru%2Fosobennosti-primenenija-i-tipovye-reshenija%2Fprotokol-obmena-s-priborami-oao-praktik-nts-i-zao-eksis.html

[~800kb] http://viewkazan.ru/foto/20110317_002.jpg (RS-232 of device)
[~800kb] http://viewkazan.ru/foto/20110317_003.jpg (connect to Arduino)

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