基于CAN总线的大型虚拟树网络设计

Large Virtual Tree Network Design Based on CAN Bus

针对大型分布式数据采集系统、设备控制系统以及二者功能融合系统对于数据可靠测控的需求,提出了一种基于CAN总线的四层级大型虚拟树网络的设计方案。文章详述了大型虚拟树网络的基本架构、逻辑与物理拓扑、层级与节点编码规则、底层数据通信格式,并介绍了构建高效且灵活的单播、多播和广播通信链路的方法。通过举例分析如何利用大型虚拟树网络为具体的教学楼设计综合控制系统,为现代教学楼的智能、节能控制系统设计提供参考。

Aiming at the requirements for reliable data measurement and control of large⁃scale distributed data acquisition systems,equipment control systems and their function fusion systems,this paper proposes a design scheme of a four⁃level large⁃scale virtual tree network based on CAN bus.The article details the basic architecture,logical and physical topology,hierarchical and node encoding rules,and underlying data communication formats of large virtual tree networks,and introduces methods for constructing efficient and flexible unicast,multicast,and broadcast communication links.Through an example to analyze how to use a large virtual tree network to design a comprehensive control system for a specific teaching building,it provides a reference for the design of intelligent and energy⁃saving control systems for modern teaching buildings.