ATO CMM 900-3W User Manual

CMM 900-3W USER GUIDE

AMPS Cellular Modem Module (3W)

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Table of Contents

1. PRODUCT OVERVIEW ............................................ 3

1.1 Features:.....................................................................................3

1.2 Serial Port Pins:..........................................................................5

1.3 Applications:................................................................................5

1.4 Your package includes:..............................................................5

2. SPECIFICATIONS................................................... 6

3.0 MODEM SETUP AND REGISTRATION ......................6

3.1 What you need to provide:.........................................................6

3.2 Registering the Cellular Modem Unit:........................................6

4. STARTING AND CONF IGURING THE MODEM .............7

4.1 DIP Switch Settings:...................................................................7

4.2 Initializing the Cellular Modem:...................................................7

4.3 Activating the Cellular Modem:...................................................8

4.4 Using the Cellular Modem to Communicate..............................8

5. THEORY OF OPERATION........................................ 9

5.1 Command State:.........................................................................9

5.1.1 Command guidelines...........................................................................................9

5.1.2 Result Codes...................................................................................................... 11

5.2 On -line State:.............................................................................12

5.3 Transitioning Online State à Command State:......................12

6. SUPPORTED AT COMMANDS................................13

6.1 AT Commands common to all modes:...................................13

7. TROUBLESHOOTING............................................15

8. FREQUENTLY ASKED QUESTIONS (FAQ)...............16

9. WARRANTY........................................................18

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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.

Power Supply

DIP Switch

RS 232 Port

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

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• Requires 5 Volts DC @ 1500 ma

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1.2 Serial Port Pins: (RS 232 interface)

Figure 2. DB9 Female RS-232 DCE Interface

Pin No. Signal Name Input/Output

1 DCD Output
2 RXD Output
3 TXD Input
4 DTR Input
5 GND
6 DSR Output
7 RTS Input
8 CTS Output
9 RI Output

1.3 Applications:

Example applications for data communications with CMM 900-3W include:

• Packet Data Radio

• SCADA and Telemetry Systems

• Remote gas/water/electric meter readings.

• Factory Automation systems

• Vending Machines

1.4 Your package includes:

• CMM 900-3W unit (Power supply and antenna are optional)

• RS 232 Cable (DB9, M-F)

• This USER GUIDE

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2. SPECIFICATIONS

Air Speed Up to 9600 bps
DTE Rate

Data Compression & Error Detection

Transmit Power 3 W
Power Supply 5 volts DC @ 1500 ma
Interface RS 232 Asynchronous
Signals supported TXD, RXD, CD, DSR, RTS, CTS, RI, DTR
Operating Temperature Range -10 °C to +70 °C
Custom Configurations Yes

300, 1200, 2400, 9600, 19200, 57600 bps (DIP
switch selectable)
MNP2-5, V42, V42bis, MNP 10

3.0 MODEM SETUP AND REGISTRATION

3.1 What you need to provide:

• 5 Volts, 1500 ma regulated DC Power Supply

• Host PC with a terminal program, such as Hyper terminal, ProComm etc.

• Mobile Identification Number (MIN) provided by your Cellular service provider.

MIN is your cellular phone number.

• System ID (SID) information (from your cellular service provider) SID uniquely

identifies your cellular service provider.

3.2 Registering the Cellular Modem Unit:

To register your cellular modem unit, do the following:

• Contact your cellular service provider

• Provide the cellular operator with the ESN (Electronic Serial Number) number

located on the label at the top of your unit.

• Inform the cellular operator that the unit is an AMPS ONLY ANALOG unit with

a power rating of Class 1 (power 3 W).

• The cellular operator will register your unit and provide you the following

information:

o MIN (Mobile Number) Number
o System preference: A or B
o SID (System ID)

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