As a network bridge, communication controller is the interface device which realize the function of communication between supervise PC and field bus.
总线控制器作为管理计算机与现场总线的接口装置，起到了管理计算机与智能仪表数据双向传输的网桥作用。
From bottom to top, the system is plotted out bus driver layer, device function driver layer, communication layer and user-interface. Each layer provides service to the layer above by interface style.
由下往上将整个驱动软件系统分为总线驱动层、设备功能驱动层、通信层和用户界面等层次，每一层都以接口的形式为上层提供服务。
To analyse the configuration process between OS protocol driver and USB bus device and the matching process between driver and the correspond device function interface.
分析出系统协议栈与USB 总线设备的配置交互过程以及设备驱动程序与设备对应接口的匹配过程。
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