Chapter 4 – Troubleshooting and Frequently Asked Questions
Multi-Tech Systems, Inc. MultiModem CDMA Wireless Modem User Guide 24
Chapter 4 – Troubleshooting and Frequently Asked Questions

Troubleshooting Examples

Situation A: The modem does not respond through the serial link

If the wireless MultiModem does not respond 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?
Check the cable connection.
Verify cable pinout.
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.