AT&T 7400B Plus User Manual page 169

DEFINITY Communications System
7400B Plus Data Module
User´s Guide
Register:
Description:
Range of
Values:
Storable:
Comments:
See Also:
S21
This S-register is used to store the status of bit-mapped options
as follows:
bit 0 — not used (default = 0, see comment 1)
bit 1 — not used (always set to 0)
bit 2 — not used (default = 0, see comment 1)
bits 3 and 4 — DTR options; value depends on argument of DTR
option command (default = 00, see &D command)
bit 5 — DCD options; 0 = always on, 1 = EIA-232-D standard
(default = 0, see &C command)
bit 6 — DSR options; 0 = always on, 1 = EIA-232-D standard
(default = 0, see &S command)
bit 7 — not used (default = 0 see comment 1)
Value may be 00 to FF hexadecimal; factory-default settings
produce a value of 00 (see comment 2).
yes
For the 7400B Plus, bits 0, 2, and 7 will be set by the
1
appropriate command, however, there will be no other
effect.
Refer to the explanation of hexadecimal values under the
2
Range of Values label description at the beginning of this
appendix.
Chapter 3, "Configuration and Operation;" refer to the indicated
''AT'' command in Appendix A, "AT Command Set."
APPENDIX C: S-REGISTERS
Page C-13