MTCMR-G-F4 Multi-Tech Systems, MTCMR-G-F4 Datasheet - Page 20

• Manufacturer Part Number: MTCMR-G-F4
• Description: MODEM GPRS QUAD BAND GSM GLOBAL
• Manufacturer: Multi-Tech Systems
• Series: MultiModem® iCellr

Specifications of MTCMR-G-F4

• Frequency: 850MHz, 900MHz, 1.8GHz, 1.9GHz
• Applications: General Purpose
• Interface: RS-232, USB
• Function: Transceiver, Modem
• Data Rate - Maximum: 115.2kbps
• Modulation Or Protocol: GSM, GPRS
• Voltage - Supply: 9 V ~ 32 V
• Package / Case: Module with Case
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Power - Output: -
• Sensitivity: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 881-1151; MTCMR-G-F4

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 iCells 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.
20
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:
AT+CSQ xx Values
Use the ATI command (Note: This command is illustrated using the capital letter I after AT)
Note:
21 – 31
11 - 20
0 - 10
99
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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
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
Signal Strength
Weak or Insufficient
Average
Exceptional
No signal
Network Registration Verification
Signal Strength Verification – RSSI
Multi-Tech Systems, Inc. MultiModem iCell Intelligent Wireless Modem User Guide
LED Bars
1 Bar LED is lit
1 Bar and 2 Bar LEDs are lit
1 Bar, 2 Bar, 3 Bar LEDs are lit
No light