Appendix C: S-Registers - AT&T 7400B Plus User Manual

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

APPENDIX C: S-REGISTERS

This appendix contains an explanation of each S-register used by
the 7400B Plus. There are 25 S-registers used to store configuration
parameters. Nine of these registers can be stored in non-volatile
memory, which will be restored when the unit is powered up.
There are two sets of stored registers, or profiles. When the 7400B
Plus is first powered on, the values that were last stored in the S-
registers are the values in effect until ''AT'' commands are issued
to change them.
You can check the current value stored in all S-registers with the
&V command (see description in Appendix A, "AT Command
Set"). To look at the contents on just one register, use the
command Smm?, where mm is the number of the S-register.
To change the value in any one S-register directly, use the
command Smm=nnn, where mm is the number of the S-register
and nnn is the number you wish to place in the register. The
following dialog illustrates the use of the S command to read and
change the value contained in an S-register:
( Enter
ats18?
055
OK
ats18=120 (
Enter
OK
The first command requests the value stored in register S18. The
7400B Plus returns the value 055, followed by OK. The next
command changes the value in register S18 to 120, and the data
responds with OK. You could enter the first command a second
time to verify that the value was changed correctly.
More information is provided in the following definitions of the
labels used in the S-register descriptions.
APPENDIX C: S-REGISTERS
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