Abstract: Intelligent Bus Switch is a typical application which is a modern development of intelligent home . Its basic function is that households can remote control the device in family by the telephone network. Take the price performance ratio, wiring, and expansion into consideration, to use the bus network as communication networks , the twisted pair as the transmission medium, and the DTMF codec data technology to implement communication. The hardware circuit is made up of the control switch circuit, the host circuit and the power supply circuit;While the software program is composed by the host and the extension procedures. The whole process is that the single chip is responsible for reading keys, to use the ordinary I / O port to control the implemention of the MT8880 software for send and receive data. The entire system which the power is centralized controlled has strong anti-interference.
Key words: Intelligent Bus Switch ; twist pair ;DTMF code technology ;MT8880