APPENDIX A: AT COMMAND SET

DEFINITY Communications System

 

7400B Data Module

Page A-12

User’s Guide

 

 

Command:

&C

Function:

Data Carrier Detect (DCD) options.

Type:

configuration

Arguments:

The &C command accepts one of two arguments as follows:

 

0 - (or no argument) maintain the DCD circuit on at all times

 

(factory-default setting)

 

1 - the DCD circuit operates according to the EIA-232-D standard

S-Register:

Bit 5 of S21 is set according to the argument used with the &C

 

command.

Example:

at&c1 [ Enter ]

Comments:

In the example, the DCD circuit operates according to the EIA-232-D

 

standard. This would be an appropriate setting for when the 7400B

 

Data Module is used at a remote site.

 

Regardless of which option is currently in effect, the DCD 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”; Appendix B, “S-

 

Registers.”

 

 

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Lucent Technologies 7400B manual Data Carrier Detect DCD options

7400B specifications

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