网络传来的控制命令经过网络接口转发到串口，中控主机通过串口接收命令进行操作，并且设置 IP 地址、网关地址和分组号都是通过串口进行的，因此串口调试是监控程序调试的第一步。-network control commands sent through the network to transmit serial interface, China controlled by the mainframe to receive orders for serial operation, and set the IP address, Gateway addresses and, through a serial port, and because of serial debugging monitoring program debugging is the first step.