C-Bus General Input Unit (5504GI) 

One of the most versatile C-Bus modules for interfacing to the 'outside world' from your C-Bus automation network. Allows support for many third party sensors and other devices. Incorporates 4 input channels for measuring digital, 0-1V, 0-5V, 0-10V, 0-20V, 0-20mA, 4-20mA, 500 ohm, 1k ohm, 3k ohm and 10k ohm thermistor inputs.

The unit triggers a C-Bus group address or broadcasts a message on the C-Bus Network in response. It therefore provides an interface between a C-Bus Network and third party products such as light level, current, temperature, pressure, differential, flow rate, power, frequency and CO2 sensors, kWh meters and moisture probes. 4 Channel, 8M modules wide, complete with 24V AC power pack.