Westermo MRD-310, Reference Manual

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Failed connects before giving up
For Accept and Connect network modes, the serial server will
attempt to establish a connection for the number of times
specified in this field before giving up and waiting for a con-
nection to be accepted.
Accept port
For Accept or Accept and Connect network modes, this is the
TCP port number that the server will listen for connections
on.
Drop current if new accept
For Accept or Accept and Connect network modes, if a TCP
connection is currently active on the serial server, and a
new connection request is accepted, this field determines
the action that will be taken. If set, the new connection will
become the active connection and the existing connection will
be closed. If not set, the existing connection will remain active
and the newly received connection will be closed.
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.
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.