CAN总线是一种广泛应用于工业控制中的现场总线，AVR系列单片机作为一种微控制器，其应用也变的越来越广泛。通过介绍CAN总线技术的特点，研究了CAN总线通信节点的设计方案，给出了具体的硬件设计方案和软件流程，比较了CAN总线与RS 485总线在通信距离、实时性、可靠性及灵活性等方面的优缺点，并介绍了CAN总线通信在车站通信系统中的具体应用。通过实践证明，CAN总线在车站通信系统中具有良好的实用价值，为铁路信号系统的技术升级奠定了坚实的基础。%CAN-bus(controller area network bus)is a field bus which is widely used in industrial control. As a microcon-troller,AVR SCM and its applications are becoming more and more widespread. The design scheme of CAN-bus communication node is studied by means of the characteristic introduction of CAN-bus technology. The specific hardware design scheme and soft-ware processes are offered in this paper. compares The advantages and disadvantages in the aspects of communication distance, real-time performance,reliability and flexibility between CAN-bus and RS-485 bus. The specific application of CAN-bus technol-ogy in the railway station communication system is introduced. The practical application proves that the CAN-bus has a good practical value in the railway station communication system,which lays a solid foundation for the technological upgrade of the railway signaling system.
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