Command Entry - Paradyne 2001 User Manual

Command Entry

P: You enter commands from the keyboard, but nothing
appears on your monitor. (You type AT and nothing
happens.)
S: Make sure you have selected the same COM port that your
DataPort 2001 is connected to.
This can be done by holding down a keyboard character
and watching the DataPort 2001's SD light to see if it
flashes. If it flashes as keys are pressed, the DataPort
2001 is receiving the data. 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. Enter an AT and carriage
return to make sure characters are displayed on your
monitor.
S: Make sure that all AT commands are terminated with a
carriage return.
S: Make sure that the cable between the DataPort 2001 and
computer (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.) If you have a Macintosh, use the supplied serial
cable.
S: Make sure that your communications software has a valid
character format. Valid formats consists of 8 data bits with
no parity, or 7 data bits with even, odd, mark or space
parity.
S: Make sure that your software is set to a valid DTE rate. The
DataPort 2001s support DTE data rates from 57,600 bps to
300 bps.
S: Make sure that your communications software is offline and
in Terminal mode.
S: Your DataPort 2001 may be configured for synchronous
operation by the &M2 or &Q2 commands. To return to
asynchronous operation, refer to the AT Command
Recovery procedure at the end of this chapter.