Westermo MRD-310, Reference Manual

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Accept port
This is the TCP port number that the server will listen for
connections on.
On-answer signaling
When set, the emulator will behave as follows: When accept-
ing an incoming connection, the emulator will transmit a single
byte to the remote host when the call is answered. When
establishing an outgoing connection, the emulator will wait
for the first byte of data before signaling that the call has con-
nected at the serial port.
TCP keepalive time
When set to a value greater than 0, TCP keepalives will be
enabled for connections, with probes sent at the frequency
specified (minutes). This may assist in detecting failed connec-
tions.
Rings until answered
This field determines the default number of rings the emulator
will wait before automatically answering a call. This is equiva-
lent to setting the ATS0 S-Register in a conventional unit.
DCD mode
This field determines the default state of the Data Carrier
Detect (DCD) handshaking line. The following modes are sup-
ported:
Always on
Regardless of the online state of the emulator, the DCD line
will be active (equivalent to AT&C0).
Follow carrier
The DCD line will be active when the emulator is in the
online state (equivalent to AT&C1).