Westermo MRD-3x0 - Manual (Page 173)

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DTR function
This field determines the default response of the unit to
changes in the Data Terminal Ready (DTR) handshaking line.
The following modes are supported:
Ignore
The emulator will ignore changes to the state of DTR (equiva-
lent to AT&D0).
Command mode
If the DTR line transitions from the active to inactive state
while the emulator is on online data mode, the emulator will
drop to AT command mode (equivalent to AT&D1).
Hangup
If the DTR line transitions from the active to inactive state
while the emulator is on online data mode, the emulator will
terminate the current call (equivalent to AT&D2).
For information on setting the Port Configuration, see section
7.2.1. For information on setting the Packet Framing, see sec-
tion 7.2.2.