Remote relay control module TCW122B-RR

TCW122B-RR is a remote relay control module that has two digital inputs and two relay outputs, with normally open and normally closed contacts.
To arrange remote relay control two devices should work in a pair – one in “client” mode and other in “server” mode.

The “Client” sends periodically the status of its digital inputs to “Server”. As an answer, the “Server” returns its digital inputs status.

The client-server model allows following variants:

• both devices are connected to the Internet, with public IP addresses;
• both devices are connected to one LAN, with private IP addresses;
• “Client” is connected to LAN (private IP address) and “Server” is connected to the Internet (public IP address);
• “Client” is connected to LAN and “Server” is connected to different LAN, but behind a router with public IP address and port forwarding.