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iR1200 Modem
44 nextel.com
What’s the
Problem?
What it means: How to Resolve:
Modem will not
power up or
down
The wiring to the
modem may not be
connected properly.
• Check the ignition
sense wiring to be
sure that it is
connected.
• Verify that the
diagnostic port is
plugged in correctly.
• Check LED status to
see if the modem is
communicating.
NOTE: The Status LED remains red for up to 3 minutes after power is
applied to the iR1200 or immediately after the Reset button is
pressed.
Diagnostic Port
The diagnostic port located on the front panel of the iR1200 modem (see Figure
9 on page 39) is used to retrieve data from the modem that will help to analyze
and diagnose possible communication issues.
The following table describes steps to connect to the diagnostic port:
1 Insert the 9-pin male end of a serial signal cable into the RS-
232 connector labeled DIAGNOSTIC PORT of the modem’s
rear panel and tighten the screws.
2 Connect the other end of the serial signal cable to a serial
COM port on the back of your computer or mobile device
and tighten the screws.