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 s