一、概述在计算机检测系统中,常配有一些数字式测量设备,如数字码盘,数字计数器等。这些设备的输出是一并行数字量。一般计算机以并行输入方式对这些数字量进行采集。在一些情况下,如测量设备与计算机相距较远时,希望采用串行输入方式来采集数据,这就需要在测量设备和计算机两方都设置串行通讯接口。目前常用的计算机串行通讯接口,如RS—232等,在一些仅需要进行数据采集的应用场合,可能会因为控制复杂,成 First, an overview In the computer testing system, often equipped with some digital measuring equipment, such as digital coders, digital counters. The output of these devices is a parallel digital quantity. General computer to parallel input of these digital quantities collected. In some cases, if the measuring device is far away from the computer, it is desirable to use a serial input method to collect the data, which requires setting up a serial communication interface on both the measuring device and the computer. Currently used computer serial communication interface, such as RS-232, etc., in some applications that require only data acquisition, may be because of the control complex, into