| 摘要 |
An air conditioning system comprising: an indoor and an outdoor unit connected through common power supply lines The indoor unit comprising a first communications circuit in communication with the outdoor unit through first and second communication lines independent of the supply lines; and a second communication circuit that communicates through one of the supply lines and a third communication line. The outdoor unit comprising a third communication circuit in communication with one of the first and second communication circuits; a switch that connects or disconnects a communication terminal with one of the common power supply lines based on a connection status between the third communication circuit and the first and second communication circuits; and a judging circuit that controls the connection and disconnection, and judges, based on the presence of an acknowledge signal, whether the first and the second communication circuit is connected to the outdoor unit.
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