AT&T 7400B Plus User Manual page 148

APPENDIX A: AT COMMAND SET
Page A-17
Command:
Function:
Type:
Arguments:
S-Register:
Example:
Comments:
See Also:
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 3, "Configuration and Operation."
&S
Data Set Ready (DSR) options.
configuration
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.
Bit 6 of S21 is set according to the argument used with the &S
command.
at&s1 ( )
Enter
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 Plus is
always off during self-test.
Chapter 3, "Configuration and Operation."
DEFINITY Communications System
7400B Plus Data Module
User´s Guide