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The Model 18/18+ Control Link provides a versatile method of relaying alarm conditions, status changes, measured data, and remote-control commands over radio transceivers instead of over wires.
 
In addition to point-to-point, Control Link supports multipoint-to-multipoint operation which allows inputs to be sent to outputs at different locations. Each Model 18 is a bi-directional unit capable of both sending and receiving on/off commands and has 8 digital inputs and outputs.
 
The Model 18+ is an expanded unit that contains more inputs and outputs, including several analog, for the reporting of incremental changes. The Model 18+ has 16 digital inputs, 16 digital outputs, 4 analog inputs, 4 analog outputs.