该程序为多机通讯程序，最多可以挂255个从机。

该程序主机发送端与多个从机的接收端相接，主机的接收端与多个从机的发送端 -The program is multi-machine communication program, up to 255 hanging from the machine. The program hosts more than from the transmitter and receiver unit phase, the host of the receiver and sender number from the machine