The Design of Greenhouse Automatic Control System Based on RS-485 Protocol

2013 Third International Conference on Instrumentation, Measurement, Computer, Communication and Control Pub Date : 2013-09-21 DOI:10.1109/IMCCC.2013.374

Haoran Zhang, Lijun Chen, Kun Liu, S. Du

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Abstract

Greenhouse control systems need to achieve three targets at the same time: low cost, high stability and the ability to implement complex control algorithm. Therefore, an automatic data acquisition and control system was designed based on RS-485 protocol in this paper. The system has three layers: the bottom layer consists of sensors and actuators, the middle layer is comprised of I/O nodes and the top layer is a main controller. An I/O node based on single chip microcomputer is responsible for executing commands of the main controller. The main controller based on ARM & Linux is in charge of scheduling of all commands. It controls temperature with hysteresis control algorithm. Firstly, the research status of hardware and topology structure was discussed, and their merits and drawbacks were found out. Secondly, an automatic data acquisition and control system was designed based on RS-485 protocol according to the needs of greenhouse control. Finally, the test process was analyzed and the running results were shown. This system was successfully used in our experimental greenhouse.

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基于RS-485协议的温室自动控制系统设计

温室控制系统需要同时达到三个目标:低成本、高稳定性和实现复杂控制算法的能力。为此，本文设计了一种基于RS-485协议的自动数据采集与控制系统。该系统分为三层:底层由传感器和执行器组成，中间层由I/O节点组成，顶层是主控制器。一个基于单片机的I/O节点负责执行主控制器的命令。基于ARM和Linux的主控制器负责所有命令的调度。采用磁滞控制算法控制温度。首先，对硬件和拓扑结构的研究现状进行了讨论，找出了各自的优缺点。其次，根据温室控制的需要，设计了基于RS-485协议的自动数据采集与控制系统。最后，对测试过程进行了分析，给出了运行结果。该系统已成功地应用于我们的实验温室。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2013 Third International Conference on Instrumentation, Measurement, Computer, Communication and Control

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