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2.
APPENDIX B: S-REGISTERS
DEFINITY Communications System
7400B Data Module
Page B-12
User’s Guide
Register:
S21
Description:
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)
Range of
Values:
Storable:
Comments:
Value may be 00 to FF hexadecimal; factory-default settings produce a
value of 00 (see comment 2).
yes
1.
For the 7400B Data Module, bits 0, 2, and 7 will be set by the
appropriate command, however, there will be no other effect.
Refer to the explanation of hexadecimal values under the Range
of Values label description at the beginning of this appendix.
See Also:
Chapter 4, “Operation and Configuration”; refer to the indicated AT
command in Appendix A, “AT Command Set.”