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Abstract
Measurement and control system plays a gatekeeper and director role in industrial production. It obtains various parameters from the production site, in order to meet the needs of production, improve quality, ensure safety in production. Distributed measurement and control systems scalability, inexpensive cost and other factors have been widely used. This paper mainly discusses a distributed measurement and control system which based on STC89C52 MCU, RS485 bus, 18B20 temperature components and ADS7822 voltage acquisition components with a main control terminal and three nodes, through RS485 communications. The main control terminal has keyboard and LCD1602 displayer, which can read each node state. Each node refers to one of the measurement and control items below (temperature measurement, current or voltage measurement, switch input measurement and switch output control).
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