Westermo MRD-3x0 - Manual (Page 181)

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7.7.3 Configuring the port function
Once the port function has been selected, click the pencil icon
in the Edit column to change the configuration of the port.
Figure 128: Modbus Gateway configuration
As shown in Figure 128, the following options can be set for
the Modbus Gateway:
TCP accept port
This field determines the TCP port number that the serial
server will listen for connections on. The value entered should
be a valid TCP port number. The default Modbus/TCP port
number is 502.
Drop current if new accept
If a 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.