基于PC总线的实时数据采集系统

Real-time data acquisition system based on PC bus

在工程应用中实时数据采集是一个重要的环节，而采用中断是提高数据采集速度的最佳方式。介绍了一种基于PC总线的数据实时采集系统，利用AD1674转换芯片可实现对4通道信号的同步采样，分辨率达12位。讨论了PC机中的8259中断、外部定时器和A／D转换，以及该系统的接口程序的C语言实现，最后通过实验验证了数据采集系统的可靠性、实用性，达到了预期的目标。

In engineering applications, real-time data acquisition is a key step, and the best way to raise speed of data acquisition is the adoption of interruption. The design and implementation of the real-time data acquisition based on PC BUS is given in this paper. Signals from 4-channel are sampled synchronously using 12-bit A/D converter AD1674. 8259 interruption, external timer, A/D conversion, and implementation of interface programme running on C ment, and the language are discussed. At last, the reliability and practicability of the system are verified by experiexpected goal is achieved