基于RS485总线的GSM-R从机故障检测设计及实现  

The design and implementation of GSM-R slave device fault detection based on RS485 bus

作　　者：贾海航 赵霞[1] 

机构地区：[1]同济大学电子与信息工程学院,上海201804

出　　处：《微型机与应用》2017年第7期1-4,8,共5页Microcomputer & Its Applications

摘　　要：RS485总线经常被用做主从系统各节点间的通信方式,系统中主从机的通信状态是整个系统正常工作的前提。文章设计了一种基于RS485总线的从机故障检测方法。首先根据需求设计了一套稳定的网络通信协议和接口函数,并提出了一种基于RS485网络通信协议的轮询方法,可实现一个主机可靠、稳定地轮询访问多个从机。主机能够检测各个从机的通信状况,并及时将从机通信故障信息上报到上位机。文章提出的在轮询基础上进行故障检测的方法,大大提高了系统的实时性。RS485 bus is often used as the communication means between the nodes of master-slave system,the communication state of devices is the premise in the system. In this paper,a slave device fault detection method based on RS485 bus is proposed. Firstly,a stable network communication protocol and interface function are designed according to the demand. Then,a polling mechanism based on RS485 network communication protocol is presented,which makes the master device communicate with multiple slaves stably and reliably. The master device can detect the communication state of each slave device,and timely report the fault information to the network management center. In this paper,the fault detection mechanism based on polling,can greatly improve the real-time performance of the system.

关 键 词：RS485 轮询 故障检测 

分 类 号：TP29[自动化与计算机技术—检测技术与自动化装置]