USR-N540 User Manual www.usriot.com
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Socket B: Only support work mode of TCP client, UDP client.
3.1. Socket A Communication
3.1.1. TCP Client Mode
1) Different from UDP mode, in this mode, connection has status of disconnection and remaining. Connection is
still remained although USR-N540 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-N540 disconnect from former connection and
reconnect.
3) It will connect to same source port when USR-N540 try to connect server and local port is not “0”.
4) It supports USR Synchronous baud rate (Similar RCF2217), which can revise USR-N540’s serial parameter as
baud rate accordingly. This function should be combined with USR-VCOM.
5) Under the same LAN, USR-N540 must be in the same network segment then can communicate. If not,
USR-N540 must be set with right one.
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