Multi-Tech Systems, Inc. MultiModem GPRS Wireless Modem User Guide 26
Chapter 4 – Troubleshooting and Frequently
Asked Questions
Troubleshooting Examples
Before calling the Multi-Tech Technical Support, check to the following connections:
● The right antenna is connected to the modem
● The serial cable connection is correct
● The power is connected correctly and the power lights on the modem are on
● Verify your signal strength
● Verify your network registration
● Use the following situation examples to troubleshoot the modem not answering and the modem returning a
No Carrier message.
Situation A: The modem does not answer
If the wireless MultiModem does not answer through the serial link upon an attempted transmission of data or
voice signals, see the table below for possible causes and solutions.
Solutions for ‘no connection through serial link’ situation
Is the communication
program properly
configured?
In communications program, verify that modem
parameters have been set to the values shown
here:
Data bits = 8
Parity = none
Stop Bits = 1
Baud = 115200 bps
Is another program
interfering with the
communication program?
Close any such application program.
Is the modem set to
autoanswer?
Type ATS0=1 (to set to auto answer on the first ring)
Type ATA (to set to manual answer)
Is the communication
program receiving RING
responses?
Type ATS0=1 (to set to auto answer on the first ring)
Type ATA (to set to manual answer)
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