At89C51与MAX186串行A/D采样程序。采集三个数码盘启动阈值，并通过串口发送到上位机。(绝对经典的单片机数据采集与传输程序，我一直在用),AT89C51 with MAX186 serial A/D sampling procedures. Acquisition of three digital disk threshold, and through serial port is sent to the host computer. (Absolute classic single-chip data acquisition and transmission program, I have been in use)