用485实现单片机之间的串行通信。 主机部分发送从机地址，等待从机响应，从机准备好就发数据,发完就接收从机的响应，接受成功就跳出循环，否则重发-Serial communication between MCU with 485. Host part of the Slave Address, waiting for the slave response from the machine ready to send data, finished his receiving slave respon