实现RS-485/RS-422和CAN转换——总线网桥的构建

The Implementation of A Bridge Between RS-485/RS-422 Bus and CAN Bus

本文介绍了一个能实现RS-485(422)总线和CAN总线相互转换的总线网桥的设计实例。这个网桥由CAN控制器SJA1000、微处理器AT89C52、CAN总线驱动器82C250和RS-422接口芯片MAX1490B等组成。文中简述了该网桥的工作原理,列出了它的程序框图,还对它的应用结果作了介绍。

The article describes a practical example of an implementation of a Bridge between RS-485/RS-422 bus and CAN bus.The Bridge is made of chipsets of CAN controller SJAIOOO. CAN interface driver 82C250,CPU AT89C52 and RS-485/RS-422 data interface MAX1490B etc. An application example of the bridge and a programming block about initialization of the bridge are given in this article. At last,the result of an application is discussed.