一种基于RS485总线的温度、湿度测控系统

Temperature and Humidity Control System Based on RS 485

利用RS 485总线构成的分布式数据采集和控制系统,具有设备简单,价格低廉,能进行较长距离的通信。在简要介绍RS 485总线相关理论的基础上,分析了RS 485总线的特点,指出其在实用过程中可能出现的问题;并结合一种实用的分布式数据采集和控制系统,来具体分析RS 485总线在实际应用系统中可能出现的干扰和通信效率较低等方面的问题,提出了解决方案。最后给出了RS 485芯片74LBC184的总线匹配电路。

The distributed data collecting and controlling system which was constitutive of RS 485 bus, have some advantage, such as few equipment, low- cost, long distance correspondence and so on. On the basis of relative reference of Bus RS 485 ,the article analyses its features, points out some problems in practical and conbines with a practical distributed data collecting and controlling system to analyse the problems of interference and low efficiency of communication which occur in the practical application system by RS 485, advances a effectual solution. Finally,the design gives the matching- circuit of 74LBC184.