51单片机串行口与PC机通讯实验。将从实验板键盘上键入的字符或数字显示到PC机显示器上，再将PC机所接收的字符发送回单片机，并在实验板的LED上显示出来。-Microcontroller serial port and PC communication experiments. Typing on a keyboard from the experimental character or number plate displayed on the PC monitor, PC, and then sent back to the character received microcontroller and displayed on the LED board in the experiment.