Research On The Embedded Node Of Dwelling Houses Based On LonWorks

With the development of modern science, the intelligence building is leading the trend of the world construction. The monitoring system is turning more and more popular in the intelligent building. The objects which need to be monitored are being diversified. It is necessary to build a kind of system which is provided with the uniform criterion,high reliability, agile establishment, good expansibility, convenient maintenance,good function and low price.But, in our country, intelligence building is still in the initial stage. Therefore, as one of the important parts of intelligentbuilding~the research in the intellective node is of crucial significance.LonWorks network control technology is a new-style fieldbus technology. LonWorks which is a kind of the most popular fieldbus has application in building, traffic, energy sources and so on. LonWorks technology gathers computer, network andcontrol, integrates all seven layers protocol of ISO/OSI, and realizes communication and control functions, being flexible in grouping and good at opening. The protocol also supports various communication media. In order to improve reliability and real time, Lon adopts unique arithmetic-Predictive P-Persistent CSMA.This paper studies the hardware and software of the intelligent node of intelligence building based on LonWorks.It Designs the intelligent node of intelligence building and connecting RS232/RS485 to LonWorks.The Neuron chip has 8 bit bus, the highest frequency is 10 MHz. Therefore its function is limited. It is not competent for some complicated control. Neuron chips as a communications processors and main processor complete the complex monitoring function. This is a good way to resolve this contradiction. To improve the processor utilization, the main processors embedded μC/OS-II operating system, which mainly used for tasks schedule. So the application program of the main processor is used as the task of the μC/OS-II embedded operating system. In order to meet the needs of practical applications, there are also other tasks operate in μC/OS-II.With the rapid development and spread of Internet technology, connecting Lon net to the Ethernet becomes practical. So it can realize the remote control of the field equipment and resource sharing. Based on the Field Bus and Internet technology, we can achieve remote surveillance system. Therefore we can realize information and control integration. This design provides a reliable, fast and cheap solution for connecting Lon Net to Ethernet.