PC机与单片机通过485进行串口通信，实现了双向通信，即PC机向单片机发送数据，单片机接收后再将数据回传给PC机，结果显示在串口调试助手上，数据为双字节的-PC-485 with the microcontroller through the serial communication to achieve a two-way communication, that is, PC, send data to the microcontroller, the microcontroller then