Lucent Technologies 7400B manual RegisterS21, Range of Values Storable Comments See Also

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)

Range of Values:

Storable:

Comments:

See Also:

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

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.

2.Refer to the explanation of hexadecimal values under the Range of Values label description at the beginning of this appendix.

Chapter 4, “Operation and Configuration”; refer to the indicated AT command in Appendix A, “AT Command Set.”