Command Echo Problems - AT&T DataPort PCX Modem User Manual

Troubleshooting
S: For an external modem, make sure the AC power
transformer is plugged into an AC power source, its
low-voltage lead is plugged into the modem, and the
modem is turned ON.
S: For an external modem, use only the power supply that
came with your modem.
S: For an internal modem, remove the telephone cord from the
modem, turn the PC Off and unplug it, open the PC, and
make sure that the modem is properly seated in the
expansion slot.
S: If your modem replaced an internal modem, remove or
disable the old modem. Refer to your PC documentation.

Command Echo Problems

P: You enter commands from the keyboard, but nothing
appears on your monitor. (You type AT and nothing
happens.)
S: Make sure your communications program is set for the
COM port that your modem is connected to (external
modem) or configured for (internal modem).
For the external modem, this can be done by holding down
a keyboard character and watching the modem's SD light to
see if it flashes. If it flashes as keys are pressed, the
modem is receiving the data from the PC. Turn character
echo ON as described in the next solution.
S: Issue the ATE1 command (character echo ON) to make
sure that characters can be echoed back to your monitor.
An OK response should appear. Type AT and press Enter to
make sure characters are displayed on your monitor.
S: For an external modem, make sure that the cable between
the modem and the PC is a standard RS-232 cable that
supports flow control and modem control signals. If the
cable is not the correct type or has been cut or crushed,
replace it. (Null modem cables, also known as crossover
cables, cannot be used.)
S: For an external modem, if your computer has more than
one serial port, try connecting the cable to another port.
6-2
Issue 2 July 1995