Digitalized measuring signal is processed in the at89c52 single chip that is the core chip of the inferior subsystem , and the measuring result is obtained , then it is transmitted to the superior subsystem through the serial - parallel interface of single chip 數字測量信號在下位機系統的核心處理芯片at89c52中計算后,得到測量結果,再經串口送入上位機系統顯示。本文的最后一章論述了上位機系統的硬件結構和軟件程序。