基于RS-485协议的单片机对等分布式控制网络

来源期刊：中南大学学报(自然科学版)2002年第3期

论文作者：彭可 陈岚 陈际达

文章页码：309 - 312

关键词：控制网络;分布式; RS-485协议;网络节点;对等通讯;中继器

Key words：control networks; distributed networks; RS-485 protocol; network nodes; peer-to-peer communication; repeater

摘    要：为了适应控制系统的分布式网络化发展趋势,构造低成本全分布式的控制网络系统,作者提出一种单片机以RS-485协议构成分布式对等控制网络的方案.通过软硬件结合的通讯模块化设计,实现了多节点RS-485总线的线路载波侦听多路复用和冲突检测功能(CSMA/CD),使节点间对等通讯成为可能.网络中继器和通用开发平台的设计和实现,提高了该控制网络的可扩展性和可重构性.经过构建实验室实际系统,验证了该方案的可行性.该方案突破了传统的主从式RS-485通讯模式,对于应用MCU或PLC等控制器形成低成本分布式控制网络具有实用价值.

Abstract: The authors introduce a distributed peer-to-peer micro-controller network based on RS-485 protocol design, to meet the developing trend of control systems from concentration systems to distribution networks. With a hardware-soft-ware communication module design, it implements CSMA/CD on multi-node RS-485 bus, and enhances the extension and reconfiguration abilities of the system by design and implementation of repeater and network development platform. A practical system constructed in the lab verifies the feasibility of the design, and shows that the design breaks the common master-slave RS-485 communication mode. It is much practicable to those low-cost distributed control networks, implemented by interconnecting MCUs or PLCs.