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Integrator’s Reference Manual
8-2 80-99208-1 Rev. D
The modem does not seem to
be getting power, even
though it is plugged in.
■ Both the AC power
connector on the diagnostic
cable and the DC power
connector on the interface
cable are plugged in. Only
one can be used at a time.
■ DTR is not asserted on a
serial port. Connect one of
the modem’s serial ports
(Data, Control, or
Diagnostic).
AT commands that you type
in HyperTerminal do not
appear on the screen.
■ Command echoing has been
turned off. Type ATE1 or ATZ
to turn echoing back on.
AT commands are not
recognized on the Data port.
■ Check to see if the Control
port is active. AT commands
will not work on the Data
port when the Control port is
active.
HyperTerminal or Dial-Up
Networking cannot talk to
the modem.
■ Make sure the baud rate in
HyperTerminal or Dial-Up
Networking matches that
for the modem port. The
Control port is 9600 only;
the Data port default is
38400 but can be set to
selected rates from 300 to
115200.
Table 8-1. Troubleshooting Modem Problems (continued)
Problem Possible Solutions