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CHAPTER 3: FIRST TIME USERS
DEFINITY Communications System
7400B Data Module
Page 3-4
User’s Guide
AT Command
Description
+++
The escape character sequence. This is one of the two
commands that does not require the AT prefix. Once
you have connected to the remote device, your data
module assumes the on-line mode of operation. If you
need to return to the command mode, leave the keyboard
idle for at least one second, and then type +++ without
pressing
[ Enter ].
Within a few seconds, the data module
will respond with OK, signifying that it has entered the
command mode and is waiting for you to type a
command.
Whether OK is returned or not depends on the setting of
certain parameters. If the factory-default settings are in
effect, OK should be returned.
O
The return to On-line command. After using the +++
escape sequence to enter command mode, you can type
ato
and press
[ Enter ]
to return to on-line mode.
Note:
This command will not work if you have
disconnected the data call.
H
&F
The hang up or disconnect command. After using the
+++ escape sequence to enter command mode, you can
type
ath
and press
[ Enter ]
to disconnect the data call.
The return to Factory-default settings command. If an
experimental change of your data module settings
produces unexpected results — and you are not sure how
to get out of the fix — type
AT&F
and press
[ Enter ].
This
will return all configuration parameters back to the
factory-default settings.
TABLE 3-2 AT Command Subset (Contd.)
SAMPLE COMMAND LINES This section presents a few sample AT command lines with
explanations of the results they will produce.
EXAMPLE 1: Dialing a number.
at d 5551212
[ Enter ]
CONNECT 2400