Patent ID: 8436541
Filing Date: 2013-05-07
Classification: H05B,Y02B

Abstract:
1. A lighting control system comprising: at least one occupancy sensor configured to provide on a signal line an occupancy signal representative of occupancy of an area, the occupancy signal being a DC voltage signal having a first non-zero voltage level maintained for a first predetermined duration followed by a second non-zero voltage level maintained for a second predetermined duration, the first non-zero voltage level being higher than the second non-zero voltage level; and a power pack coupled to the at least one occupancy sensor and configured to receive the occupancy signal on the signal line, the power pack comprising a load switching device configured to be coupled to a lighting circuit, and the power pack being configured to actuate the load switching device responsive to the occupancy signal; wherein the power pack is further configured to monitor the signal line to detect occurrences of the first non-zero voltage level.