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