摘要
该文设计了一种挂载设备数量和总通信距离不受总线驱动力限制的改进型RS485总线,通过采用串联式总线接入方式,在总线设备上增加具有信号中继功能的结构,来解决传统RS485总线通信距离和设备数量受驱动能力限制的问题,可延长总线通信距离,增加总设备数量;并设计了一套协议系统来适应这种硬件结构,通过协议实现总线设备上电自动查询和编址、实现设备之间的顺序通信,以及故障处理和设备热插拔处理。
A kind of improved RS485 bus was designed,whose number of devices mounted and the total transmission distance were not limited by bus driving force. Serial bus access method was used,and structure with signal relay function was added to bus device,the improved bus can extend communication distance and increase the number of total devices;A protocol system was designed to adapt to this kind of hardware structure. The protocol can help realize number of bus devices automatic query and automatic addressing on the power,sequential communication among the devices,fault handling and device hot-plug.
出处
《自动化与仪表》
2016年第10期32-35,共4页
Automation & Instrumentation
基金
河南省高等学校重点科研项目(16A460027)
