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1. SCOPE
1.1. WHAT IT IS
This document describes the data modem used in the ActiveKEY product. The modem will be a PTCRB certified generic
data modem that can be used in other applications beyond the ActiveKEY product. The modem supports SMS and GPRS
data transmission, using the GSM cellular network.
2. ELECTRICAL COMPONENTS
2.1. CELLULAR DATA MODEM
The wireless communication for this design is currently handled by an Enfora GSM0408MG700 Cellular modem module.
This is a quad band module and is controlled by the associated GE proprietary application running in the module.
The cellular data modem circuit was designed for use in the ActiveKEY product and as a stand alone cellular data modem
for universal use in any GE applications requiring digital cellular communication capability.
The module resides on a small circuit board that also contains a interface parts for battery charging, connection to external
keypad and LCD display, and USB and power input ports. The cellular modem will work over an input voltage range of
3.3 to 4.3 VDC.
2.2. ENFORA RADIO
The Enfora module used in the ActiveKEY is the GSM0408MG700. For more information on the Enfora radio, please
refer to the following documents:
GSM0308IG_Enfora_Enabler_IIIG_Integration_Guide_
-_Revision_1.03.pdf
AT Command Document GSM0308AT001
2.3. RADIO COMMUNICATION
The AT+CPMS command is used to query the Enfora for the number of received messages currently stored in its SIM.
The AT+CMGL command is used to get the Enfora to output a list of received messages stored in the SIM, and their
associated index number (1-25).
The AT+CMGR command reads a specific message from the SIM, accessed by its index number.
The AT+CMGD command deletes a message from the SIM, again, accessed by its index number.
2.4. SWITCHING POWER SUPPLY
All power control and battery charging control circuitry are internal to the Enfora radio module.
3. MODULE INTERFACE
For universal applications of the GE modem card all communications to the modem are through the USB port.
Input power is derived through connection to J201 with the positive connection on pin 1, and ground on pin 2.
ActiveKEY Modem User Manual
Title
Page - 3 - of 5
Classification: GE Public
Version
1.03
1.01
Date
07/17/07
07/03/07
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