Westermo MRD-3x0 - Manual (Page 196)

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Extended Command Set
Command Description Usage
&C Data Carrier Detect
(DCD) mode AT&C0 – DCD always on
AT&C1 – DCD on while in
online mode
&D Data Terminal Ready
(DTR) function AT&D0 – Modem ignores
DTR.
AT&D1 – DTR ON - >DTR
OFF while in online mode
causes modem to drop to
command mode
AT&D2 – DTR ON -> DTR
OFF while in online mode
causes modem to hangup
&F Initialise the modem ATF
&S Data Set Ready
(DSR) mode AT&S0 – DSR always on
AT&S1 – DSR on while
negotiating or connected.