目前相当多的测量仪表配有IEEE—488接口(以下简称488接口),它可与微机联机构成数据采集系统。有的微机本身配有488接口,可以方便地与这类测量仪表联机。但有相当多的单板机并没有488接口,只配有通用并行接口如Z80—PIO或8255等。对于某些单板机与488接口的联机问题,已有文章介绍,但总离不开硬件,有些甚至附加了相当多的硬件,以 At present a considerable number of measuring instruments equipped with IEEE-488 interface (hereinafter referred to as 488 interface), which can form a data acquisition system with the computer. Some computers with 488 interface itself, you can easily with these types of measuring instruments online. However, there are quite a few board machines that do not have a 488 interface and only have common parallel interfaces such as Z80-PIO or 8255. For some single-board computer and the 488 interface on-line problems, articles have been introduced, but always inseparable from the hardware, and some even attached a considerable amount of hardware to