Abstract: Facing the rapid development of Smart-House and the diversification of communication protocol, it introduces the popular communication protocols, X-10 and CEBus, and compares their advantages and disadvantages. Then, it established a short distance communication protocol, based on FSM. With the power line carrier used, the protocol is characteristic of low cost, and it has good openness as well as security. Furthermore, this protocol uses the technology of finite state machine so as to resolve the problem of communication conflicts, ensuring communication with stability in real time.

Key words: finite state machine; communication protocols; smart house