The circuit designing of data acquisition board , especially of the parallel communication interface is thoroughly analyzed and the protocol of communication between pc and the data acquisition board is defined 本文重點論述了數(shù)據(jù)采集板硬件電路的設(shè)計,特別是并行通信接口電路的設(shè)計,定義了上下位機相互間通信的協(xié)議。