Patent ID: 6854660

Claim:
An air conditioner control system that uses a PSTN to control a plurality of air conditioners, said control system comprising: an electronic device having a control program driven to control the plurality of air conditioners; a transmitting module that converts and codes an initial control command signal input through the control program into a DTMF signal and transmits the DTMF signal to the PSTN; and a receiving module that receives the DTMF signal transmitted from the transmitting module over the PSTN and transmits a final control command signal based on the DTMF signal to an air conditioner identified in the DTMF signal, wherein the receiving module comprises: a telephone line connector connected to the PSTN that receives the DTMF signal transmitted by the transmitting module; a signal decoder that converts and decodes the DTMF signal received by the telephone line connector into the final control command signal that can be utilized by the air conditioner; and a microcomputer that transmits the final control command signal converted and decoded by the signal decoder to the air conditioner, and transmits operating state data of the air conditioner operated according to the final control command signal to the PSTN.