Lucent Technologies AT&T 7400B - Manual (Page 66)

DEFINITY Communications System APPENDIX B: S-REGISTERS
7400B Data Module
User’s Guide Page B-1
APPENDIX B: S-REGISTERS
This appendix contains an explanation of each S-register used by the
7400B Data Module. An S-register is an 8-bit location in non-volatile
memory that is used for storing the value of one or more configuration
parameters. When the data module 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 S mm ?,
where mm is the number of the S-register.
To change the value in any one S-register directly, use the command
S mm=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:
ats18? [ Enter ]
055
OK
ats18=120 [ Enter ]
OK
The first command request the value stored in register S18. The data
module 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.