AT&T 7400B Plus User Manual page 168

APPENDIX C: S-REGISTERS
Page C-12
Register:
Description:
Range of
Values:
Storable:
Comments:
See Also:
Register:
Register:
S18
The value in this S-register establishes the duration of diagnostic
tests initiated by the &T command.
Value may be 000 through 255 seconds. The factory-default
value is 0.
yes
Any locally initialized test in progress is automatically
terminated when the time specified in S-register 18 has elapsed.
If S-register 18 is set to 0, a test initiated by the &T command
must be terminated manually. Issuing the &T0 command
terminates any locally initiated test immediately, regardless of
the value in S-register 18.
Chapter 3, "Configuration and Operation;" Appendix A, "AT
Command Set."
S19 — not used
S20 — not used
DEFINITY Communications System
7400B Plus Data Module
User´s Guide