通信芯片的介绍，时序图原理等。实现工业通信必备-Introduction of communications chips, such as the timing of Principle. Necessary to achieve industrial communication

个人写的基于MSP430F149的modbusRTU协议的实现，代码完全可用，压缩包内有编译无错误和运行测试例子的截图证明，使用时直接将.h和.c文件加入工程，修改相应的IO和串口即可，芯片使用MAX3485-Achieve personal written agreement based on MSP430F149 modbusRTU code fully available, compression packages have sc