Some interface circuits are also used to realize other functions . the system is consisting of data sampling unit , data processing unit , master controlling unit and human - machine interface unit 主要包括數(shù)據(jù)采集單元、數(shù)據(jù)處理單元( dsp單元) 、主機(jī)控制單元( mcu單元)和人機(jī)接口單元等。