초록 ▼

Building lights are master controlled to reduce power consumption under building master control, or in response to electric utility commands to the building computer. Each lighting wall control unit includes a transceiver which can communicate to at least one neighbor transceiver, thereby forming a

Building lights are master controlled to reduce power consumption under building master control, or in response to electric utility commands to the building computer. Each lighting wall control unit includes a transceiver which can communicate to at least one neighbor transceiver, thereby forming a distributed communication network extending back to the building computer. The transceivers operate asynchronously with low data rate FSK signals, using carrier frequencies between 900 and 950 MHz. Different communications protocols control packet forwarding and acknowledgement so that messages reach their destination but are not forwarded in endless circles, and so that collisions are minimized.

대표청구항 ▼

[ What is claimed is:] [1.] A method of controlling at least one parameter at a plurality of device control points within a building, comprising:transmitting a first radio signal, having a first power level sufficient to be received reliably at at least one of the device control points, and insuffic

[ What is claimed is:] [1.] A method of controlling at least one parameter at a plurality of device control points within a building, comprising:transmitting a first radio signal, having a first power level sufficient to be received reliably at at least one of the device control points, and insufficient to be received reliably at all device control points within the building, from a master control point, the first radio signal including a digital control signal relating to said parameter,receiving the first radio signal at one of the device control points, andtransmitting a second radio signal, having a second power level sufficient to be received reliably at at least another of the device control points, and insufficient to be received reliably at all device control points within the building, from said one of the device control points, the second radio signal including said digital control signal.