这是基于485通信的一个例子程序，对于基础的学习还是挺有用的，里面包有详细的解释，非常值得一看，我找了好久才找到的呢-This is an example based on 485 telecommunications program for the foundation of learning or quite useless, which package are explained in detail, is worth a visit, I find it a long time to f