Westermo IDW-90 AT - Manual (Page 32)

32 6620-3200
DTR: Data terminal ready
The serial status line DTR is used to control the ISDN connection.
0: No control
Outgoing calls: The DTR level will be ignored to establish
a connection.
Incoming calls: Incoming calls will be accepted independent
of DTR status.
Disconnection: DTR drop does not disconnect an active
connection.
2: DTR line will be considered
Outgoing calls: The DTR level will be considered.
DTR off in the command mode refuses the call
procedure with ERROR.
Incoming calls: Incoming calls will be accepted only when DTR
is ON. The incoming call request can be refused
with changing DTR to off.
Disconnection: DTR drop disconnects an active connection or
a call during the dial phase.
If DTR will be dropped immediately after sending
serial data there is no guarantee to transmit this
data to the destination side.
A delay of (configured "txfwd" time + 10ms)
between sending the last data byte and dopping
the DTR line would send out the last data stream.
4: DTR ignore and DTR drop disconnects
Outgoing calls: The DTR level will be ignored to establish
a connection.
Incoming calls: Incoming calls will be accepted independent of DTR
status.
Disconnection: DTR drop disconnects an active connection.
If DTR will be dropped immediately after sending
serial data there is no guarantee to transmit this
data to the destination side.
A delay of (configured "txfwd" time + 10ms)
between sending the last data byte and dropping the
DTR line would send out the last data stream.