Research On Fieldbus For The Intelligent Buildings

With the rapid development of IT industry,the continuous change of implicate of the Building Automation System & the foreground of application on the the LonWorks Technoligy in areas of buildings,industry and so on. The intelligent buildings and intelligent community based on LonWorks are playing more and more important role in the buildings. Further more,Ethernet technoligy is also utilized in the intelligent buildings and intelligent community.Therefor,the perfect integration of Ethernet technology and LonWorks Technology become the key in present research.The paper mainly expounded LonWorks Technoligy3 such as :LonTalk communicate protocol, NodeBuilder3 design tools, Shortstack micro-server,LNS3 network tools and i.LON LonWorks network connection devices. All of the above are the base of design BAS based on the LonWorks Technoligy.Combined designing one BAS based on the LonWorks Technoligy, technical networking plan are applied on connecting router with physical medium such as RS485,electric power line,fiber etc. realized various construct network interlinkage in LonWorks. Combining electrical control require, using LonWorks intelligence Node include of different Neuron Chip acquiring and controling different character data such as temperature, pressure, Variable Air Volume,electrical parameter etc.and transfer network variable and obvious message in LonWorks network, realized system control quite decentralization and enhanced dependability. Realized integration between LonTalk protocol and Transmission Control Protocol/Internet Protocol by adopted DDE(Dynamic Data Exchange)and client/server, and Realized con-operate between LonWorks network and Transmission Control Protocol/Internet Protocol network, made the system has good opening and expansibility.The planning method mentioned above has been used in the BAS based on the LonWorks Technoligy. The instances have been testifies the validity of those planning method.