在本设计中采用AT89C51作为系统的控制单元，元器件的选用上即满足设计需要又考虑到了成本问题。
This design use AT89C51 as the control unit in the system. Design requirement and cost problem are thought when choosing the components.
在区域控制单元中，分别介绍了处理单元、输入信号检测、看门狗电路、通信扩展的设计。
Also many design methods are put forward when introducing of the area part, such as processing unit, input signal detection, watch dog circuit, extended communication and so on.
在载车板控制单元中，分别介绍了主从机通信、输入信号检测、状态显示、手动功能以及电源的设计方法。
As to the loading board part, many design methods are introduced, such as master-slave communication, input signal detection, status displaying, manual action, power supply and so on.
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