针对RS485通信总线型拓扑结构从设备自动分配地址和即插即用的难题,采用了从设备自动控制总线通断的方法来实现自动分配地址;采用新增从设备进行实时监听在线信息自动设置地址的方法来实现即插即用。主设备发现总线异常后发送清除地址命令恢复所有从设备到初始状态。经过长时间现场试验验证,RS485总线型即插即用技术现场使用灵活方便、稳定可靠。 For RS485 communication bus topology from the device automatically assign addresses and plug and play problems, the use of the device automatically control the bus off method to automatically allocate addresses; Way to achieve plug and play. After the master finds that the bus is abnormal, it sends a clear address command to restore all slaves to the initial state. After a long time field test to verify, RS485 bus plug and play technology field use flexible and convenient, stable and reliable.