USR-N668 User Manual Technical Support:
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Figure 44 TCP Server setting
4.4.2. Heartbeat Packet Function
Heartbeat packet: Module will output heartbeat data to serial or network periodic. User can configure the heartbeat
data and time interval. Serial heartbeat data can be used for polling Modbus data. Network heartbeat data can be used
for showing connection status and keep the connection (only take effect in TCP/UDP Client mode).
The longest for Custom heartbeat package content is 40 bytes, the heartbeat time is 30 seconds, the range is 1~65535
seconds.