User`s manual

U.S. Robotics I-modem Command Reference
Troubleshooting • Page 15-2
¥ Be sure your communications software is set to the correct bit rate and word length (7
bits with or without a parity bit, or 8 bits and no parity).
¥ Check that DIP switch
2 is ON, for Òact on AT commands.Ó If the switch is OFF, power
off the I-modem, set the switch ON, and power on the I-modem again. Then try typing
AT <Enter> again.
¥ Make sure that verbal result codes (status messages) are enabled. Send these commands
to the I-modem:
ATQ0 <Enter> (to enable message display)
ATV1 <Enter> (to display verbal messages)
¥ Review your communi-cations software manual to see what Carrier Detect (CD) opera-
tions your software requires. Then see Chapter 6, Controlling EIA-232 Signaling
.
¥ Although it is a rare condition, check to see if your computer is reversing the send/
receive functions at the EIA-232 interface. Refer to your computerÕs documentation.
Double characters are appearing on your monitor
This is a signal that both the I-modem's local echo and your software's local echo are on.
Type the command to turn off your online echo (ATF1 <Enter>) or turn your communica-
tions software's local echo off (refer to your softwareÕs documentation).