1.利用MAX232实现单片机与微机的串行通讯，借助串口调试助手软件正确接收发送数据.2.使用单片机和MAX485建立距离不低于5米的串行通信系统。-1 using MAX232 to achieve the serial communication between the microcontroller and the computer, with the help of serial debugging assistant software to receive and send data correctly.2. microcontroller and MAX485 to establish a distance of not less than 5 meters of the serial communication system.