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Chapter 3 – Using Your Wireless Modem
Phone Numbers for the Wireless Modem
● Every wireless modem will have its own unique ph one number.
● The phone number may simpl y be given to you by yo ur 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 Vista or XP, 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. AT commands for the MultiModem Cells are
published in separate Reference Guides included on the MultiModem CD and posted 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
AT+CSQ xx Values
0 - 10
11 - 20
21 – 31
99
Signal Strength
Weak or Insufficient
Average
Exceptional
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 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
0,0
0,1
0,5
Network Registration Status
The modem is not registered on any network
The modem is registered on the home network
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.
Multi-Tech Systems, Inc. MultiModem Cell User Guide
19
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