Program is how to call the API function serial and communication example, no third party controls, you can set up a virtual serial port.

说明：程序是如何调用API的串口函数，及通讯示例，不需要三方控件，可以设虚拟串口。

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The key technology of gate opening detected, opening controlled, serial communication by API function, are mainly discussed.

对系统中涉及的闸门开度检测、开度控制、利用API函数进行串行通讯等关键技术作了较详细的介绍。

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