为自制多功能数据采集卡编写了DLL 形式的驱动程序,并将其挂接到labview 开发平台上,利用DLL 驱动程序实现了对步进电机的自动控制.-The driver DLL form prepared by the self-made multi-function data acquisition card, and hooked up to the the labview development platform on DLL driver to achieve automatic contro