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GM29 INTEGRATOR’S MANUAL
14
LZT 123 7361 R1B
2. GM29 Modem
2.1 Description
The dual band EGSM 900/1800MHz GM29 is a GSM/GPRS serial
modem. The modem is a powerful and flexible device that can be used
in a wide range of telemetry and telematics applications that rely on the
remote exchange of data, voice, SMS or faxes via the GSM cellular
network.
Small and lightweight, the GM29 has standard connectors and an
integral SIM card reader making it easy and quick to integrate. As well
as providing a standard RS232 serial communication interface the
GM29 also has an audio interface allowing an analogue handset to be
connected. When the GM29 is integrated into an external application, a
wireless communications system is created.
A typical end-to-end system consists of a micro controller in an external
application communicating, via the GM29 modem, with a remote
terminal or host using the GSM network. The micro controller uses a set
of AT commands to control the modem, and to set up the end-to-end
communications link, via its 9-way RS232 serial interface.
GM29 serial modems are intended to be used by manufacturers, system
integrators, application developers and developers of a wide range of
equipment and business solutions, typically in the following fields:
• Security and alarms
• Vending
• Monitoring and control
• Utilities
• Fleet Management
2.2 Highlights
• Dual band, EGSM 900/1800MHz, GSM/GPRS serial modem
• Flexible plug-and-play device
• Data: GPRS, HSCSD, CSD, SMS
• Voice: full rate, enhanced full rate, half rate
• SMS: mobile-originated, mobile-terminated, cell broadcast
• Fax: Group 3, Classes 1 & 2
• RS232 9-way serial interface
• 5V - 32V d.c. input
• 4-wire audio connection
• Antenna connection (FME male)
• R&TTE type approved