3onedata NP318T-8DI User Manual page 39

In the pair mode, two serial servers need to be used in pairs. One of the serial server
for the slave mode, for the passive connection, listen to a designated port, passively
waiting for the connection. Another serial server is the master mode, and the
destination address is the IP address of the slave mode serial server, the destination
port is the listening port of the slave mode serial server.
Interface Description
Pair mode interface screenshot
Pair mode interface main element configuration instructions
Interface Elements
TCP alive time
Listen Port
Dest Address
Description
The device sends a heartbeat packet by setting the time
interval.
If the device sends a heartbeat packet three times without
receiving a
disconnected. If the time interval is set to "0", this function
does not turn on.
Applied to the pair salve mode, that is, the destination port
of the pair master mode device.
Applied to the pair master mode, that is, the IP address of
the pair slave mode device.
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