The CAT Sensor Interface Module (SIM-C-V) is a low-voltage device that provides network addressability for low voltage occupancy ceiling sensor such as low voltage Greengate Occupancy Sensor. The CAT Sensor Interface Module communicates with other CAT devices, via CAT5e cable, through its two RJ-45 connectors. The module is powered by the CAT bus power and comes with mounting tabs for easy installation on the wall or a junction box. The CAT bus power is used to power up to X Greengate occupancy sensors. The CAT Sensor Interface Module detects a maintained dry contact closure from the Greengate sensor and sends the occupancy status data to a CAT Dimming Switchpack to turn on/off a group of light fixtures.