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