The software function, modules and data organization of the Upper Layer Computer are explained, the process of main program and that of the communication with Upper Layer Computer are narrated.
详述了上位机软件的功能、模块及数据的组织，分析了主程序流程和与下位机通信的流程。
Designs and realizes the fore-born child process communication layer of the fontal machine system.
设计和实现了前置机系统的预先派生子进程的通讯层。
Secondly, the USB protocol and USB transmission layer are analyzed. The USB system and communication process are plain.
其次分析了USB协议和蓝牙us B传输层，明确了USB的体系结构及usb的通信过程。
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