Gsm Manual

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  • Topic: GSM, Serial port, Serial communication
  • Pages : 9 (994 words )
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  • Published : March 19, 2013
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GSM MODEM WITH TTL
USER MANUAL

Bitsforge Technologies Pvt LTD
5/750L, Manathu Ayathu Moola
Near NGO Quarters, Thrikkakara PO
Kakkanad, Kochi-21.Ph 0484-2421825
Email:info@bforge.com,
Website: www.bitsforge.com

Contents
Chapter -1 GSM Modem with TTL .............................................................................................. 3

Introduction................................................................................................................................. 3 SIM 900 Module ......................................................................................................................... 3 How to work with? ...................................................................................................................... 5 AT Co mmands ............................................................................................................................ 7 Testing modem with PC ............................................................................................................ 10

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Chapter -1 GSM Modem with TTL

Introduction

The GSM Module with TTL interface is well suitable for Remote Wireless Applications. The module uses SIM900 which is a Quad band GSM/GPRS engine. The hardware consists of only 5 connections TX,RX,VCC(5V), Gnd and PWRkey . It can be easily interfaced to micro controllers. The controlling device(The Application running on an Embedded System) controls

the Modem by sending AT command through its serial

interface. The board consists of external sim interface,power on switch,power on led etc. This module also supports internet connectivity of devices through GPRS.

SIM 900 Module

The new SIM900 - ultra compact and reliable wireless module. This is a complete QuadBand GSM/GPRS module in a SMT type and designed with a very powerful single-chip processor integrating AMR926EJ-S core, allowing you to benefit from small dimensions and cost-effective solutions. Featuring an industry- standard interface, the SIM900D delivers GSM/GPRS 850/900/1800/1900MHz performance for voice, SMS, Data, and Fax in a small form factor and with low power consumption. With a tiny configuration of 33mm x 33mm x 3mm, SIM900D can fit almost all the space requirements in your M2M applications, especially for slim and compact demands of design

Salient Features of SIM 900
 Quad-Band 850/ 900/ 1800/ 1900 MHz
 GPRS multi-slot class 10/8

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LPC2138 User
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 GPRS mobile station class B
 Compliant to GSM phase 2/2+
 Class 4 (2 W @850/ 900 MHz)
 Class 1 (1 W @ 1800/1900MHz)
 Dimensions: 24*24*3mm
 Weight: 3.4g
 Control via AT commands (GSM 07.07
 07.05 and SIMCOM enhanced AT Commands)
 Low power consumption: 1.0mA(sleep mode)
 Operation temperature: -40°C to +85 °C\
Specifications for Fax
 Group 3, class 1
Specifications for Data
 GPRS class 10: max. 85.6 kbps (downlink)
 PBCCH support
 Coding schemes CS 1, 2, 3, 4
 CSD up to 14.4 kbps
 USSD
 Non transparent mode
 PPP-stack
Specifications for SMS via GSM/GPRS
 Point to point MO and MT
 SMS cell broadcast
 Text and PDU mode
Software features
 0710 MUX protocol
 embedded TCP/UDP protocol
 FTP/HTTP
Special firmware
 FOTA
 MMS

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How to work with?

1.Insert the SIM
Open the sim holder placed at the back side of the Modem and insert your SIM. 2.Connect the Antenna
Tighten the Antenna if not connected by rotating the nut. Don't rotate the Antenna 3.Interface the Board as shown in the figure below
Insert the Jumper when you are using the module with micro controllers with 3.3V I/O voltage. The default baud rate is 9600 bps.
4.Power on the Module
The module should be powered on by pressing the switch on the board 5..LED status
The board is equipped with two LEDS- a green LED for Power status and red LED for network status

Green LED- It will glow whenever the board is connected...
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