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APPENDIX B: S-REGISTERS
DEFINITY Communications System
7400B Data Module
Page B-14
User’s Guide
Register:
S23
Description:
This S-register is used to store the status of bit-mapped options as
follows:
bit 0 — allow remote loop request from remote system; 0 = disabled,
1 = enabled (default = 1, see &T command)
bits 1, 2, and 3 — local communications speed (see comment 1)
0 = 300 bps
1 = not used
2 = 1200 bps
3 = 2400 bps (factory-set default)
4 = 4800 bps
5 = 9600 bps
6 = 19200 bps
7 = not used
bits 4 and 5 — local parity setting; 0 = even, 1 = space, 2 = odd, and
3 = mark/none (default = 0)
bit 6 and 7 — not used (see comment 2)
Range of
Values:
Storable:
Comments:
Value may be 00 to FF hexadecimal; factory-default settings produce a
value of 07 hexadecimal (see comment 3).
yes
1.
Hayes compatible modems use only bits 0, 1 and 2 for speeds up
to 2400 bps. The 7400B Data Module uses bit 3 to support
speeds above 2400 bps.
2.
Bits 6 and 7 are set by the appropriate command, but there will
be no other effect.
3.
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.”
Register:
S24
— not used