基于嵌入式ARM平台的远程I O数据采集系统的研究和开发.doc

Research and Development of the Remote I/O Data Acquisition System Based on Embedded ARM Platform
INTRODUCTION
With the wide use of worked, intelligent and digital distributed control system, the data acquisition system based on the single-chip is not only limited in processing capacity, but also the problem of poor real-time and reliability. In recent years, with the rapid development of the field of industrial process control and the fast popularization of embedded ARM processor, it has been a trend that ARM processor can substitute the single-chip to realize data acquisition and control. Embedded ARM system can adapt to the strict requirements of the data acquisition system, such as the function, reliability, cost, size, power consumption, and so on. In this paper, a new kind of remote I/O data acquisition system based on ARM embedded platform has been researched and developed, which can measure all kinds of electrical and thermal parameters such as voltage, current, thermocouple, RTD, and so on. The measured data can be displayed on LCD of the system, and at the same time can be transmitted through RS485 or work to remote DAS or DCS monitoring system by using Modbus/RTU or Modbus/TCP protocol. The system has the dual work and long-munication function, which can ensure the disturb rejection capability and reliability of work. The new generation remote data acquisition and moni- toring system based on the high-performance embedded ARM microprocessor has important application significance.
STRUCTRUE DESIGN OF THE WHOLE SYSTEM

The whole structure chart of the remote data acquisition and monitoring system based on embedded ARM platform is shown in Figure 1. In the scheme of the system, the remote I/O data acquisition modules are developed by embedded ARM processor, which can be widely used to diversified industries such as electric power, petroleum, chemical, metallurgy, steel, transportation and so on. This system is mainly used for the concentrative acqui