1、 I 摘 要 未来几十年 ， 在世界范围内 ， 水资源的矛盾将日趋紧张 。 我国的水资源严重短缺 ， 且分布很不 平衡。 农业用水占总用水的 80%。 在农业灌溉中推广自动化控制 ，不仅可以缓解水资源严重短缺的 矛盾， 同时可以提高农作物的产量 ， 降低农产品的成本 。本文介绍一种系统，它用于大棚、花窖、房间喷水、消毒的自动及人工控制 ,实现大棚喷水消毒系统。该系统通过对房间湿度采集并计算判断湿度是否符合该房间植物生长的标准，并根据需要及时进行喷水。同时为了防御病虫害，也具备定时喷洒农药和消毒溶液的功能；由于不同植物的不同特性，本系统还能对液体（ 包括水，药液）的流量 、 流速进行控制，以适应
2、喷洒更均匀、有效。本系统采用多机串行通信方法，实现任一点到点或点到多点的通信，使管理人员可以使用一台 IBM-PC机控制其它点的工作。 关键词： RS-422 单片机 串行通信 II Abstract Next several dozens years, around the world, water resources contradiction day by day anxious. Our countrys water resources critical shortage, and distributes is not very balanced. The agricultural w
3、ater occupies the total water used 80%. Promotes the automated control in the agricultural irrigation, not only may alleviate the water resources critical shortage the contradiction, simultaneously may enhance the crops the output, reduces the agricultural product the cost. This article introduces a
4、 kind of system applied for watering and spraying disinfectants. The system can watering automatically by judging the humidity whether its comfortable to plants in the room and can spraying disinfectants against plant diseases and insect pests. According to meet the need of pouring demand， the syste
5、m can be adjusted to control the rate and the speed of flow. This system adopts pc to multi-single chip microcomputer serial communication network which tallies with RS-422 standard. It can achieve point to point or point to points corresponding which the jockey can take advantage of to control single chip microcomputer through IBM-PC. Keywords:RS-422 SCM Serial communication
