USRIOT USR-N520, User Manual

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13 / 69
Connection is still remained although USR-N520 does not send data.
2) Identify disconnects. After connection built, it sends keepalive searching packet every 15 seconds.
Once there is an interrupt, it can be detected rapidly then make USR-N520 disconnect from former
connection and reconnect.
3) It will connect to same source port when USR-N520 try to connect server and local port is not “0”.
4) It supports USR Synchronous baud rate (Similar RCF2217), which can revise USR-N520’s serial
parameter as baud rate accordingly. This function should be combined with USR-VCOM.
5) Under the same LAN, USR-N520 must be in the same network segment then can communicate. If
not, USR-N520 must be set with right one.
6) Support USR Cloud.
7) Support Modbus TCP function.
8) USR-N520 work as TCP Client, it connects to TCP server, Destination IP and port should be cared.
The IP can be device with same LAN, also can be different LAN or cross public network. If it
connects to server cross public network, the server should have public IP.
9) USR-N520 work under TCP Client, It connects to the target IP/Port automatically,will not accept
other connection request.
10) As TCP Client, need to set USR-N510’s local port number to be “0 then it can visit server with
randomized port number, so that it can solve unsuccessful re-connection in case server judge
connection status abnormally and shield USR-N520 re-connection request.
11) Test Example
1
Open “USR-TCP232-M4_E45 setup” software.
Set USR-N520 as TCP Client, Destination IP: 192.168.0.95. Destination port:20108.
Click “Save COM1”, and search USR-N520.
Then check if the parameters are correct when USR-N520 is found.
Configuration