多通道CAN总线组网研究

Research on Multi-channel CAN Bus Networking

在工业监控系统中,建立高速、可靠的数据通信通道是其中的关键技术。针对实际监控系统超过500个现场节点的要求,应用可靠快捷的CAN总线组网技术,并对各种CAN总线扩展组网方案进行研究,分析各组网方案的原理,比较其优缺点,在实际系统中采用通过多串口卡扩展CAN通道组网方案,充分利用计算机高速分时采集数据、处理数据的特点,提高系统的可靠性。并给出系统中部分电路原理图和软件程序流程图。

Building high- speed and reliable communication channel is crucial technology in industry monitor system. Aiming at requirements over 500 field nodes in practical monitor system,the reliable and fast CAN bus technology is used. Various extended CAN bus networking schemes are studied. The theories of schemes are analyzed. Advantages and disadvantages are compared. The extended networking project through multi - serial port card is adopted in the practical system. It makes good use of the computer characteristics of high speed and time - sharing dada collection and processing. The reliability of system is improved. Parts of circuit theory chart and program flow chart are illustrated.