本文件描述了一个基于串口实现文件传输的协议eXmodem，该协议基于标准Xmodem File Transfer Protocol，是一个独立标准，完全功能，全新的文件传输协议。



1)该协议除实现Xmodem File Transfer基本功能，即已实现了在两个设备相互之间，通过串口把一个设备内文件传输至另一个设备内；其增强功能所列参考如下：

a)两个设备相互之间传输文件能够以一致的文件目录存放；

b)两个设备相互之间可以传输任意大小的文件，而Xmodem File Transfer只能传送128 *n字节大小的文件；

c)具备避免一个文件在两个设备相互之间重复传输的功能，提高了文件传输的效率。

-This document describes the realization of a document based on serial transmission agreement eXmodem. Based on the agreement Xmodem standard File Transfer Protocol, Standard is an independent, fully functional, new file transfer protocol. 1) Implementation of the agreement except Xmodem File Transfer basic functions, is realized in equipment between the two, put through a serial devices to another document transmission equipment; its reference listed enhancements are as follows : a) between two equipment to transfer files to the same directory storage; b) equipment between two transmission can be any size document, and Xmodem File Transfer can only transmit 128 * n byte size of the document; c) avoid a document with the equipment between two transmission repeat function, improve the file t