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在虚拟仪器的设计中,选择适合的数据采集系统是很重要的。文章在对各种现成数据采集卡,接口总线的理解对比的基础上,以ADS8412为核心设计了集多路选通、模拟信号调理、A/D转换为一体的模拟信号采集系统,借助CPLD时序控制功能以PCI 9054为核心芯片设计实现了基于PCI总线的数据采集卡的控制系统,用Builder C++编写了采集卡的动态链接库,利用LabVIEW提供的调用库函数节点,完成了通过动态链接库调用数据采集卡的过程。
In the design of virtual instruments, it is important to choose the appropriate data acquisition system. Based on the comparisons of various off-the-shelf data acquisition cards and interface buses, this paper designs an analog signal acquisition system with multi-channel strobe, analog signal conditioning and A / D conversion taking ADS8412 as the core. With CPLD timing Control Function PCI 9054 as the core chip design and implementation of a PCI bus-based data acquisition card control system with Builder C ++ prepared the acquisition card dynamic link library, the use of LabVIEW call library function nodes, completed through the dynamic link library call Data acquisition card process.