Research And Realization Of The BACnet Protocol

The Inte11igent building which is the inevitable result that the information technology is applied in the construction domain, in recent years, obtained the rapid development and the popularization. Also it obtains the social widespread approval and takes day by day. In the last few years, the intelligence building market mored forword quickly and there are tens of the building automatication system, however neither the intelligent building nor the intelligent plot has the national standard about this and what's the most important is that the core technology is grasped by the overseas enterprises.The BACnet standard: A Data Communication Protocol for Building Automation and Control Networks, the only opening international standard in the buikding automation control area, gives us not only the opportunity but also the challenge to follow firstly and catch up lastly with the international advanced technique. This thesis is made up of five chapters, emphasizing the research of the BACnet protocol, staring from the realization of the most basic data types, carefully discusses the process of the protocol realization. Some of the most important features of the BACnet, including the system architecture, the BACnet object and its property, the BACnet service and the technique of the BACnet/IP, are the most important components and the most important basement of the realization of the BACnet protocol. With the rule of the protocol encoding, the process of the realization of the BACnet protocol is carefully discussed by the sequence of BACnet tag encoding, data type encoding, application layer user data encoding, application layer and the other layers under it control information encoding. This realization of that standard, is the most important foundation and the premise of the development of the building automatic control equipments that have the independent intellectual property rights.