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1. PRODUCT OVERVIEW
The Cellular Modem Module, CMM 900-3W, uses the Advanced Mobile Phone System
(AMPS) cellular network for data transmission. AMPS is the cellular system used in North
America, Latin America, Australia, New Zealand and parts of Africa. AMPS system is not
compatible with the digital systems, such as GSM (Global System for Mobile
Communications).
CMM 900-3W has RS232 interface and supports the popular AT command set normally
associated with modems. Optionally TTL interface is also available.
Figure 1. CMM 900-3W
1.1 Features:
• Uses AMPS Circuit Switched Cellular network for data transmission
• User friendly modem AT command set
• Choice of TTL or RS 232 serial interface
• Choice of Hardware or Software Flow Control
• Incorporates “Quiet Mode” (Section 6.1) thereby enabling communication with
“non-intelligent” systems
DIP Switch
RS 232 Port
Power Supply