The 725 telemetry system provides bi-directional, transceiver, remote switching.   Each Module has two Switch inputs and two Relay changeover contact outputs.  When two or more modules are paired together the relay outputs will follow the state changes of the other modules’ Inputs.

The 725-IP input module can be connected to the 725-TRX to provide 4 extra inputs per module. The system inputs / outputs can be used in various ways which are shown in the datasheet.