Appendix A: At Command Set - AT&T 7400B Plus User Manual

DEFINITY Communications System
7400B Plus Data Module
User´s Guide

APPENDIX A: AT COMMAND SET

Label
Command:
Function:
Type:
Arguments:
S-Register:
This appendix contains an explanation of each AT command
accepted by the 7400B Plus. Labels used in the descriptions are
defined as follows:
Description
The command is shown as it should be typed. The command may be
typed in uppercase or lowercase. Spaces may be typed between multiple
commands on the same command line for readability, but the spaces are
ignored by the 7400B Plus.
A brief, functional description of the command is provided here.
Type may be immediate or configuration. An immediate command causes
the 7400B Plus to perform an action as soon as the command is sent (for
example, go off-hook or dial a number). A configuration command
modifies a configuration parameter during the current session.
Many commands accept or require a numerical argument. Whether an
argument is required and the range of acceptable values for the
argument is shown here.
The S-registers consist of 28 1-byte memory locations in the data module,
designated as S0 through S27. The S-registers hold values for defining the
current configuration of the 7400B Plus. Some commands modify a
specific
S-register, and some commands perform an action based on the current
value stored in an S-register. Whether an S-register is modified or read
by the current command is explained here.
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APPENDIX A: AT COMMAND SET
Page A-1