这个是第三方串口类，使用C++语言编写，使用灵活方便，数据的发送和接收只需要一个函数，类中重载了多个接收和发送的成员函数。-This is the third-party serial type, the use of C++ language, the use of flexible and convenient to send and receive data need only one function, type in a number of heavy-duty members rec