3、虚拟串口驱动程序进行了测试，达到了预期目标。关键字:通讯设备类；枚举过程；虚拟串口程序；抽象控制模型46河南城建学院本科毕业设计（论文）英文摘要46河南城建学院本科毕业设计（论文）英文摘要AbstractUSB interface supports plug and play which has unified standards, so it has a wide range of applications. More and more computer device use USB interface to transfer data, so how t
4、o make many old deaves to support USB interface without changing current application is becoming the hot field. USB Communication Device Class and it's abstract control model are studied, principles of Communication Device Class and implementation techniques of abstract device are a
5、lso analyzed in the thesis. On the basis of this, design and implementation of virtual serial port driver based on Communication Device Class are given. The overall structure and implementation scheme of virtual serial port driver based on CDC are designed. The virtual serial port d
6、river is made up of two parts which are communication command transfer module and data transmission module. The communication command transfer module satisfies the specification of abstract control model, and the data transfer part improves the technique of current virtual serial po
7、rt. The main works in the thesis are as follows:1)The request and transfer model for USB protocol are studied, and the implementation techniques of virtual serial port are analyzed. 2)The implementation scheme of virtual serial port driver that satisfy abstract control mode in CDC i
