通过自收自发实验，可以验证硬件及软件设计，常用于自测试。实验要求向发送端口发送一组字符串“Self-Communication by 8251!$”，然后从接收端口进行接收，将接收到的数据显示在显示器屏幕上-Collected spontaneously through experiments can verify the hardware and software design, commonly used in self-test. Experimental request to send