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CHAPTER 3: FIRST TIME USERS
DEFINITY Communications System
7400B Data Module
Page 3-6
User’s Guide
EXAMPLE 4: Changing data options.
at el &d2 s0=5
[ Enter ]
This command line is a command sequence that sets up the 7400B Data
Module to automatically answer incoming calls. The commands set the
following parameters:
●
●
●
●
AT is the required command prefix,
e1 causes characters entered from the keyboard to be echoed to the
screen while in command mode
&d2 causes the data module to hang up the call when the local
terminal turns off DTR
s0=5 causes the data module to enter automatic answer mode and
answer incoming calls on the fifth ring.
A SAMPLE ON-LINE
SESSION
This section outlines how to perform a simple on-line session using the
AT commands described in this chapter. For more information about all
AT commands, see Chapter 4, "Operation and Configuration" and
Appendix A, “AT Command Set.”
Starting the Session
The following is a sample data call to a fictitious bulletin board service.
If you know the number of a "real" bulletin board service, you might try
an actual log on by using that number and following the suggestions in
this session.
at d 9-555-7575
[ Enter ]
CONNECT 1200
The D command is used to dial the number of the bulletin board. Since
the connection was made successfully, the data module responded with
a message that says the remote end connected at 1200 bps.
The remote end may do nothing until you press a particular key a few
times, usually [ Enter
]. Typical of many data communications application
programs, this sometimes required input lets the remote end determine
whether you have connected with the correct communications
parameters in effect.
Possible Display Problems
If the response from the remote end is unintelligible “garbage,” chances
are that the speed or parity bit selection is incorrect. In this case,
assuming that your terminal device allows, the parameters may be
corrected without disconnecting the call. Otherwise, you must
disconnect, correct the parameters, and then try the call again.