说明：  自己编的基于at89s52的8路光开关控制程序，含与上位机串口通讯部分，单片机通过232通信接受来自上位机的控制信号，并控制8路光开关切换。可以返回当前状态，并显示在小灯上。
(Own series a at89s52 of 8-way optical switch control program, with part of the serial communication with the host computer the MCU through 232 communication accept control signals from the host computer, and control 8-way light switch. Can return to this state, and displays it on a small lamp.)