GSM is a cellular network, which means that mobile phones connect to it by searching for cells in the immediate vicinity. GSM networks operate in four different frequency ranges. Most GSM networks operate in the 900 MHz or 1800 MHz bands. General Packet Radio Service (GPRS) is a packet oriented Mobile Data Service available to users of Global System for Mobile Communications (GSM) and IS-136 mobile phones. It provides data rates from 56 up to 114 kbit/s. GPRS can be used for services such as Wireless Application Protocol (WAP) access, Short Message Service (SMS), Multimedia Messaging Service (MMS), and for Internet communication services such as email and World Wide Web access.

BitsMind Technologies GSM/GPRS Modem-RS232 is built with Quad-Band GSM/GPRS engine, works on frequencies 850/ 900/ 1800/ 1900 MHz. The Modem is coming with RS232 interface, which allows you connect PC as well as microcontroller. The baud rate is configurable from 9600-115200 through AT command. The GSM/GPRS Modem is having internal TCP/IP stack to enable you to connect with internet via GPRS. SmartGSM-GPRS Development Board - The SmartGSM/GPRS is a development tool that will help in clear understanding of GSM & GPRS technologies. The intuitive design of SmartGSM/GPRS guides student and experienced engineer in learning to combine these two technologies and develop cutting edge products & applications. It is suitable for SMS, Voice as well as DATA transfer application in M2M interface.

Quad-Band 850/ 900/ 1800/ 1900 MHz, GPRS multi-slot class 10/8, 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),Supply voltage: 3.2 ... 4.8V

Low power consumption: 1.0mA(sleep mode), Operation temperature: -40C to +85 C

SmartGSM/GPRS supports SIMCOM GSM modules: (SIM900A)

There are IDC10 headers that are connected to GSM module pins. Also there are IDC10 headers for connecting GSM modules to various types of microcontrollers

Antenna Holder enables easy antenna mounting on-board

Audio Interface 2 - Connects GSM audio interface with on-board microphone and speaker

There are two buttons for switching system on or off

RS-232 communication with PC or microcontroller

Audio Amplifier - Audio Amplifier for speaker

Time pulse LED is on-board and shows current status of GSM module

Audio Interface 1 - Connect GSM module audio interface with your microphone and speaker

Microphone - On-board microphone is used for voice input

There is on-board SIM Card Holder where you can place your SIM card

Speaker - Speaker system for testing GSM voice applications

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