Patent ID: 6865898

Claim:
An air-conditioning system comprising: a plurality of indoor units and a plurality of outdoor units each including a compressor, operatively controlled to transmit and receive operation data; an outdoor transmission/receiving unit included in each of said outdoor units, for transmitting by superposing operation data on an outdoor power line for supplying power to said outdoor units and receiving said operation data superposed on said outdoor power line; an indoor transmission/receiving unit included in each of said indoor units, for transmitting by superposing operation data on an indoor power line for supplying power to said indoor units and receiving said operation data superposed on said indoor power line; an outdoor conversion unit for transmitting a radio signal produced by converting said operation data superposed on said outdoor power line into the radio signal, and receiving and superposing a radio signal on said outdoor power line; and an indoor conversion unit for transmitting a radio signal produced by converting said operation data superposed on said indoor power line into the radio signal and receiving and superposing a radio signal on said indoor power line, wherein an identification signal is assigned to each of said outdoor and indoor conversion units, and said radio signal contains operation data and a flag information representing the identification signal, and wherein each of said outdoor and indoor conversion units determines whether a received radio signal is required to be received from a desired conversion unit based on the identification signal contained in the received radio signal, and when the received radio signal is required to be received from the desired conversion unit, samples and converts the received radio signal into a power-superposed signal.