The Service-evaluating System Based on AT89C series single-chip computer consists of a host, a lot of window evaluating device, and a PC.

基于AT89C系列单片机服务评价系统，由一台评价主控机、多台窗口评价器和一台PC机组成。

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This system takes the upper and lower machine control mode, which means PC as the host computer and PLC as the lower computer.

本系统采取上下位机的控制模式，工控机做为上位机，PLC作为下位机。

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By using VC, the software in host computer is programmed. The information about speed of racecar and the centerline of the racetrack etc., is displayed on PC.

最后通过利用VC软件设计的上位机软件，在PC机上显示了赛车速度、赛道中心线等信息。

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