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APPENDIX A: AT COMMAND SET
DEFINITY Communications System
7400B Data Module
Page A-14
User’s Guide
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
See Also:
&F
Load the factory-default configuration.
immediate
none
none
at&f
[ Enter ]
The factory-default configuration values are permanently stored in
ROM and can be recalled at any time. No reset or self-test is initiated
by issuing the &F command.
Chapter 4, “Operation and Configuration.”
Command:
&S
Function:
Data Set Ready (DSR) options.
Type:
configuration
Arguments:
The &S command accepts one of two arguments as follows:
0 - (or no argument) the DSR circuit is maintained on at all times
(factory-default setting)
1 - the DSR circuit operates according to the EIA-232-D standard.
S-Register:
Bit 6 of S21 is set according to the argument used with the &S
command.
Example:
at&s1
[ Enter ]
Comments:
In the example, the DSR circuit is configured to operate according to
the EIA-232-D standard. Regardless of which option is currently in
effect, the DSR circuit of the 7400B Data Module is always off during
self-test, and turns off for 0.5 second during a disconnect sequence.
See Also:
Chapter 4, “Operation and Configuration.”