一种基于RS-485总线的自定义通信协议及其应用  

A Self-defining Communication Protocol Based on RS-485 Bus and Its Application in DCS

作　　者：宋凯[1] 纪建伟[2] 王健波[1] 

机构地区：[1]沈阳理工大学计算中心,辽宁沈阳110168 [2]沈阳农业大学信息与电气工程学院,辽宁沈阳110161

出　　处：《科技情报开发与经济》2005年第19期240-241,共2页Sci-Tech Information Development & Economy

摘　　要：RS-485总线是中小型集散系统常用的组网方法,但其协议并没有一个统一的标准,为此给出了一种基于RS-485总线的自定义通信协议,并用有限状态机模型对其可靠性做了定性分析。本协议具有编程简单、易扩展、易移植等特点。结合一个沥青拌和站实时监控系统的实例说明了本协议的具体应用。RS-485 bus is commonly used in the medium and small-scale DCS, but its protocol does not have a unified standard. This paper puts forward a self-defining communication protocol based on RS-485 bus in detail, and make qualitative analysis on its dependability with the finite state machine model. This protocol can be programmed simply, expanded easily, and transplanted conveniently. Connecting with an example of the real-time monitoring system of an asphalt mixing station, this paper explains the concrete application of this protocol.

关 键 词：RS-485总线 自定义通信协议 有限状态机 流量控制 死锁 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置] TN915.04[自动化与计算机技术—控制科学与工程]