AT&T 7400B Plus User Manual page 172

APPENDIX C: S-REGISTERS
Page C-16
Register:
Description:
Range of
Values:
Storable:
Comments:
See Also:
Register:
Register:
S25
The value in this S-register determines how long a change of
state (OFF to ON or ON to OFF) on the Data Terminal Ready
(DTR) lead must persist before it is acknowledged. If the change
of state persists for a shorter time than is specified in S-register
25 it is ignored.
Values may be 000 through 255 hundreds of a second (0.01 sec.).
The factory-default setting is 5 (0.05 sec.).
yes
none
Chapter 3, "Configuration and Operation."
S26 — not used
S27 — not used
DEFINITY Communications System
7400B Plus Data Module
User´s Guide