According to the characteristics of RS-485 bus network structure and environment,the paper analyses the factors affecting the reliability of network communication,and puts forward some effective hardware measures to improve the reliability of RS-485 net.

• 根据RS-485总线网络结构和网络现场环境特点,分析了影响RS-485总线网络系统通信可靠性的因素,提出了有效的提高通信可靠性的硬件措施,对于工业控制系统设计人员具有指导意义。