Multitech Wireless EDGE User's Guide download pdf (Page 18)

Chapter 3 – Using Your Wireless modem

Multi-Tech Systems, Inc. MultiModem EDGE Wireless Modem User Guide 18

Chapter 3 – Using Your Wireless

Modem

Phone Number for the Wireless Modem

• Every wireless modem will have its own unique phone number provided by your wireless provider.

• The wireless modem’s phone number may simply be told to the subscriber or be on the SIM 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 EDGE 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.

Verify Signal Strength

Using HyperTerminal, type AT+CSQ

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

RSSI ranges from 0 to 31.

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

Signal Strength – RSSI

10 - 31 Sufficient

0 - 9 Weak or Insufficient

99 Insufficient

Checking Network Registration and Roaming Status

Using HyperTerminal, type AT+CREG?

The modem will respond in one of the following ways:

+CREG: 0,0 (this tells you that the modem is not registered on any network)

+CREG: 0,1 (this tells you that the modem is registered on the home network)

+CREG: 0,5 (this tells you the modem is registered on a network but it is roaming)

Note: If the modem is showing not registered, perform the procedure for verifying signal strength to determine

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 ATI

Product information displays. For example, Siemens MC75 Revision xx.yy (xx.yy is the software version)

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Multitech Wireless EDGE User's Guide Page 18