Data Set Ready; Data Terminal Ready - Motorola V.3400 User Manual

Data Set Ready &S
These commands control the DSR signal generated by the modem to
indicate that the modem is ready for operation. DSR must be on for
some terminals and devices to communicate with the modem.
Command
&S
&S1
&S2
&S3
* default
Data Terminal Ready &D
In data mode DTR may be used for modem control.
Command
&D
&D1
&D2
&D3
* default
Note
If DTR controls dialer is selected, then selecting DTR active
will cause an autodial after an off-to-on transition of DTR.
DSR always on*
DSR on when off hook in data mode
DSR off for 5 seconds after disconnect then returns to on
DSR follows off hook (OH) signal
The modem ignores DTR.*
The modem goes to command mode from data mode
when DTR goes from on to off.
Disconnects when DTR goes from on to off; disables
autoanswer while DTR is off
Disconnects, recalls command mode, and resets the
modem to a stored configuration when DTR goes from on
to off
In dial line mode the modem disconnects; in leased line,
the modem retrains.
Operation
Operation
V.3400
AT Commands
5-19