Secondly , it sets forth the basic principle and constitutes of the full open cnc and so on , and focuses on down - level communication of hardware - function module by using wdm technology , the newest technology developed by microsoft co . , and develops a wdm device driver for digital i / o module ( hy - 6140 digital input card ) in pcnc based on windows2000 , which can rapidly and correctly reads the digital signal outside from the hy - 6140 digital input card through real testing 然后，阐述了全开放cnc基本原理和构成等，并把重点放在pcnc硬件功能模块的底层通讯的开发上，采用微软推出最新一代的wdm技术，在windows2000平台上为pcnc中的数字i / o模块( hy - 6140数字输入卡)开发了一个wdm设备驱动程序，通过实际测试能够实时准确地读取外部的数字信号。
