USR-N540 User Manual www.usriot.com
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3. Product Function
USR-N540 Function Diagram
Each serial port corresponds to two socket: socket A and socket B. Socket B can be opened or closed.
Notes: USR-N540 supports double sockets. It means one serial port corresponds to two sockets.
Socket A: Supports TCP client, TCP server, UDP client, UDP server, Httpd client