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Appendix A. AT Commands and S-Registers
61203153L2-20 Express 3000 User Manual A-5
Carrier Detect (CD) Control Line Options
Command Function
&C0
CD forced on.
&C1
CD normal.
&C2
CD off with local disconnect (LOCD).
&C3
CD off with link down.
Data Terminal Ready
(DTR Control Line Options)
Command Function
&D0
Ignore DTR.
&D1
DTR off forces command.
&D2
Idle when off. DTR off forces idle. (On allows auto answer.)