MTCBA-G2 Multi-Tech Systems, MTCBA-G2 Datasheet - Page 19

• Manufacturer Part Number: MTCBA-G2
• Description: MODEM GPRS CELLULAR SERIAL
• Manufacturer: Multi-Tech Systems
• Series: MultiModem® Cellr

Specifications of MTCBA-G2

• Function: Transceiver, GPRS, Modem
• Modulation Or Protocol: GPRS
• Frequency: 850MHz, 900MHz, 1.8GHz, 1.9GHz
• Applications: General Purpose
• Interface: Serial
• Data Rate - Maximum: 85.6kbps
• Voltage - Supply: 9 V ~ 32 V
• Package / Case: Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 881-1153

Phone Numbers for the Wireless Modem
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.
Multi-Tech Systems, Inc. MultiModem Cell User Guide
Chapter 3 – Using Your Wireless Modem
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Verifying Signal Strength
Checking Network Registration and Roaming Status
Checking the Modem’s Identity
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.
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).
In this procedure, you will verify that the MultiModem has been registered on the wireless network. Using
HyperTerminal, type AT+CREG?
Wireless provider implementations may vary.
RSSI ranges from 0 to 31.
BER ranges from 0 to 7 (Seven is the highest error rate).
The modem will respond in one of the following ways:
Use the ATI command (Note: This command is illustrated using the capital letter I after AT)
Note:
●
●
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strength of the received signal.
If the modem indicates that it is not registered, verify the signal strength to determine if the problem is the
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.
Value
0,0
0,1
0,5
AT+CSQ xx Values
21 – 31
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
11 - 20
0 - 10
99
Signal Strength Verification – RSSI
Network Registration Verification
Signal Strength
Weak or Insufficient
Average
Exceptional
No signal
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