摘要:随着分散式控制系统在自动化控制领域的不断发展，当今越来越需要对外部多个事物同时进行数据采集。本设计所使用的LABVIEW，是一种常用的人机交互界面，主机和从机之间通过RS-485总线相连，仅通过两根数据线连接就可以方便地组成一个数据传输远、可靠性高、一主多从式的分散数据采集系统。本次设计的数据分散采集系统是通过设计以AT89C51单片机作为微处理器，使用传感器对外界事物进行数据采集，并通过时钟电路对测量结果进行修正，然后通过MAX485系统传输数据。系统PC机界面使用LabVIEW软件进行设计，可以同时记录多个传感器所采集到的数据。通过传感器采集数据，并使用MAX485的通信模块，将采集到的数据发送到计算机中，并且采集到的数据将在LabVIEW界面中显示，以便实现远程监控和控制。

关键词 485总线 ；单片机；LABVIEW；分散数据采集

Abstract:In the field of automation and control, along with the development of distributed control systems, industrial control systems, often using serial communication to achieve the purpose of remote communication. This design uses LabVIEW software, via RS-485 bus connection between master and slave have a good interactive interface, simply use two data lines can be easily formed a transmission distance, good reliability, a master and multiple slaves distributed data acquisition.This design of the sensor detection system sub-module using AT89C51microprocessor as the next-bit machine, sensor data acquisition desired target binding. At the same time,we can use the sensor in the microprocessor collect dates from the things in the outside world, in order to compensate the measurement results, the purpose of reducing the false alarm rate. Using LabVIEW to imitate software interface in the syetem PC, you can upload data, while monitoring multiple sub-modules. Data collected by the sensor, using the MAX485 module tocommunicate, the collected data to a host (computer terminal receiving end), and show the date you collected on the labview,to realize the monitor and control from the long distance

Keywords  485 bus  Microcontroller  LABVIEW  Distributed data acquisition