OCCUPANCY SENSOR WITH MULTI-LEVEL SIGNALING
First Claim
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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.
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Abstract
A lighting control system includes a power pack and an enhanced occupancy sensor configured to implement multi-valued signaling to encode additional information into the occupancy signal it provides on the signal line. The power pack is configured to monitor the signal line to detect and interpret the additional information. In one example, the lighting control system also includes a manual override switch coupled to the signal line and/or to the occupancy sensor.
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Citations
67 Claims
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1. A lighting control system comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 12, 13, 14, 15, 16, 17, 18, 19, 20, 66, 67)
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8-11. -11. (canceled)
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21-40. -40. (canceled)
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41. A method of controlling a lighting circuit, the method comprising:
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receiving on a signal line an occupancy signal representative of an occupancy status of an area, the occupancy signal including a first non-zero voltage level and a second non-zero voltage level, the first non-zero voltage level being higher than the second non-zero voltage level; monitoring the signal line to detect subsequent occurrences of the first non-zero voltage level; deriving movement information from detected occurrences of the first non-zero voltage level; and controlling the lighting circuit responsive to at least one of the occupancy signal and the movement information. - View Dependent Claims (42, 43, 44, 55, 57, 58)
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45-54. -54. (canceled)
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56. (canceled)
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59-65. -65. (canceled)
Specification