Multi-Tech Systems MTCBA-G-F4 User Manual download pdf (Page 15)

Chapter 3 – Using Your Wireless Modem

Multi-Tech Systems, Inc. MultiModem GPRS Wireless Modem User Guide 15

Chapter 3 – Using Your Wireless

Modem

Phone Numbers for the Wireless Modem

• Every wireless modem will have its own unique phone number.

• The phone number may simply be given to you by your wireless service provider or it may be on the SIM card

or both. Wireless provider implementations may vary.

Examples of Useful AT Commands

A Note About HyperTerminal

In order to verify signal strength and roaming status, you must use a terminal application such as HyperTerminal. To

open this program in Windows XP or Windows 2003, go to Start > All Programs > Accessories > Communications

> HyperTerminal. Other Windows operating systems have similar paths to HyperTerminal. See your system’s online

Help if you cannot find it.

A Note About AT Commands

AT commands can be used to operate, configure, and query your modem. A reference guide to the GPRS commands

is included on the MultiModem CD and on the Multi-Tech Web site.

The following two commands let you query signal strength and roaming status.

Verifying Signal Strength

Using HyperTerminal, type AT+CSQ

The modem responds with the received signal strength (rssi).

The modem responds with the received signal strength (rssi) and the channel bit error rate (ber).

RSSI ranges from 0 to 31.

Signal Strength Verification – RSSI

21 – 31 Exceptional

11 - 20 Average

0 - 10 Weak or Insufficient

99 No signal

BER ranges from 0 to 7 (Seven is the highest error rate).

Checking Network Registration and Roaming Status

In this procedure, you will verify that the Wireless MultiModem has been registered on the wireless network.

Using HyperTerminal, type AT+CREG?

The modem will respond in one of the following ways:

Network Registration Verification

Value Network Registration Status

0,0 The modem is not registered on any network

0,1 The modem is registered on the home network

0,5 The modem is registered on a network and it is roaming

Note: If the modem indicates that it is not registered, verify the signal strength to determine if the problem

is the strength of the received signal.

Checking the Modem’s Identity

Use the ATI command (Note: This command is illustrated using the capital letter i after AT)

• Type ATI0 (Note: The command ends in a zero)

The manufacturing data displays. For example: Wavecom Modem Multiband G850 1900

• Type ATI3

The software version displays. For example: 651_09gg...

• Type ATI6

Displays modem data features. For example: data rates, data modes, fax classes.

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Multi-Tech Systems MTCBA-G-F4 User Manual Page 15

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