The Research And Realization Of The Intelligent Node For The Lonworks Bus Based On Embedded System

Along with the intelligence building and intelligence uptown uninterrupted development, LONWORKS network support having already become a universally accepted industry standard, having got several thousands world everywhere manufacturers in control system field in the whole world building. But in the aspect expanding nature, parallel single of product, the outside sets up a product other only the neuron chip and its expansion I/O mouth quantity is limited, requiring that the manpower and material resources throwing into a great quantity carries out repeated exploitation. The LONWORKS bus intelligence node design procedures based on embedded system that we bring forward here, develops out one kind of the intelligence controller based on embedded system, supporti.ng the TCP/IP protocol and the LONWORKS bus transmission control protocol in the field of intelligence building.The paper expounded the design train of thought and realization method of the intelligence controller. The controller was turned to adopt modularization design, select and use a new model tiny controller AT91RM9200 based on ARM920T core industry level as CPU of the intelligence node controller. It has RS-232 and RS-485 bus interface, human-computer interaction module, I/O module, A/D and D/A transition module, Ethernet interface and so on. In human-computer interaction module, has adopt one large scale new and original to design the LCD display module coming liquid crystal display under the control of chip SID13506, that module occupancy volume is small, the power dissipation is low, the function is strong, the function is good, have height untying image degree, may be used for 800 X 600 display occasion, the very good energy artwork data to memory carries out display, matches the function of touching screen importing and pronunciation warning together. In the I/O module, adopt I/O to expand the mouth coming to expand I/O chip GM8166, system may select and use the corresponding function module according to different controlled member, compile and compose the corresponding IO mouth driver. The paper accomplished the communication interface design between the AT91RM9200 and Neuron 3150 chips. Finally the paper introduced the connection of embedded intelligence controller, and LON net, and the application of embedded intelligence node in uptown intellectualized system.Entire system data handling speed is quick, nature price compares highly, soft hardware can cuts down, consumer interface friendship, controlling of all in readiness, satisfied different function consumer need. Component selected and used by system all is an industry level component, may work under adverse circumstances.