多点温度测量系统
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密 惠 保
随着社会的进步和工业技术的发展，人们越来越重视温度因素，许多产品对温度范围要求严格，而目前市场上普遍存在的温度检测仪器大都是单点测量，同时还有温度信息传递不及时、精度不够的缺点，不利于工业控制者根据温度变化及时做出决定。在这样的形式下，开发一种能够同时测量多点，并且实时性高、精度高，能够综合处理多点温度信息的测量系统就很有必要。
本课题以AT89C51单片机系统为核心，能对多点的温度进行实时巡检。各检测单元（从机）能独立完成各自功能，同时能够根据主控机的指令对温度进行定时采集，测量结果不仅能在本地显示，而且可以利用单片机串行口，通过RS-485总线及通信协议将采集的数据传送到主控机，进行进一步的存档、处理。主控机负责控制指令的发送，控制各个从机进行温度采集，收集测量数据，并对测量结果（包括历史数据）进行整理、显示和存储。主控机与各从机之间能够相互联系、相互协调，从而达到系统整体统一、和谐的效果。
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关键词：单片机 RS485协议 温度测量
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Abstract
As the industry and the society developing, the temperature becomes more and more important and a lot of products are sensitive to temperature. However, temperature-measuring apparatus in the market now only can check and measure the temperature of one point, at the same time, the temperature information is not real time and the precision is low. It takes a great of troubles for the industry-controllers to make decision .In this situation, design and implement one applicable system which can watch measure and control the temperature and the measuring results is real time and the precision is great is more essential. In order to meeting this application, this paper talk about The Multiple-Point’s temperature Measuring System.
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This system based on single chip computer, can inspect and control multiple temperatures in real time. The Slaved Machine can collect temperature information on its own and display it on the LED module. Following the Master Machine’s command, the Slaved Machine can up-send the temperature information to the Master Machine through the RS-485 bus interface and the communication protocol. The Master Machine sends commands, controls the Slaved Computer gathering and up-sending the temperature data including history information, and it manages processes and stores the temperature information. The Master and Slaved Computer will exchange information and correspond to each other, so it works together perfectly.
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