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Chapter 3 - Troubleshooting
Multi-Tech Systems, Inc. MultiModem CDMA User Guide 17
Chapter 3: Troubleshooting
Situation A: The modem does not answer through the serial link
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
If the modem
returns …
Then ask … Action
Is the modem powered correctly? Provide a power supply in the range of 5 to
32Vdc.
Is the serial cable properly connected to
the modem and PC sockets?
Connect cable per step 2 of the ”Electrical
Installation and Configuration” procedure.
Verify cable pinout per”RS232 15-Pin
Connector Pinout” table, esp Rx & Tx
connections.
Verify reception & transmission.
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
(nothing)
Is another program interfering with
the communication program?
Close any such application program.