用于初学串口通讯的，上位机给单片机发送信息，单片机收到后，做处理再返回到上位机，包括仿真电路都有，可以直接调试。-Serial communication for the beginners, the host computer to the microcontroller to send messages, Microcontroller receipt, do deal with and then returned to the host computer, including the simulation of the circuit are, you can debug directly.