实现主从多机通信，一个主机，三个从机，三个开关实现配置通信地址，矩阵键盘为发送数据，在地址相配的从机会显示相应的数字。无源码，提供两个hex(To achieve master slave multi machine communication, a host, three slave computers and three switches are used to configure the communication address. The matrix keyboard is for sending data, and the corresponding number is displayed from the opportunity matching at the address.)