This paper made use of USB communication protocol to complete collecting and sending data.
本文采用USB通信协议，完成数据的采集与发送。
In chapter four, the thesis processes USB communication system collectivity design after introducing USB communication protocol.
第四章在介绍了USB通信协议基础上，进行USB通信系统的总体设计。
USB protocol layer describes the grammar and protocol used in the communication of USB host with USB devices, and presents the USB hierarchy consisting of fields, packets, transactions and transfers.
US B协议层描述了USB主机与usb设备交互时的语法和协议，从中定义了字段、包、事务和传送的结构，以及由字段到包、由包到事务、由事务到传送所组成的组织层次关系。
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