用c编写的Modbus通信协议，希望给予其他的人帮助。-Written by using c language source code for modbus communication protocol. Want to give others help.

XModem is a common, easy to use file transfer protocol. XModem for FEZ is based on the c# sample from Andreas Wö gerbauer net.trackday.cc. With some modifications to make it work under NETMF, it should be possible to implement on the FEZ platform

crc16 通讯校验程序，非常简单好用,c语言 -crc16