This system use the floater style sensor , mechanical encoder to get water - level signal , and use the at89c51 single chip system to transform the signal into water - level data , use modem through pstn to transmit data for a long - distance , and designed a information management software system hi the irrigation works bureau information center for communication and data management . the structure of the system was discussed in the thesis 該系統(tǒng)使用浮子式傳感器、機(jī)械式編碼器獲取水位信號(hào),利用at89c51單片機(jī)系統(tǒng)采集水位數(shù)據(jù)(簡(jiǎn)稱:下位機(jī)系統(tǒng)) ,采用調(diào)制解調(diào)器、通過公共電話網(wǎng)( pstn )遠(yuǎn)程傳輸數(shù)據(jù),并在泰興市水務(wù)局信息中心通過主控計(jì)算機(jī)(簡(jiǎn)稱:上位機(jī))進(jìn)行通信及信息系統(tǒng)管理。