The centralized power monitoring system monitors the various parameters of various equipment such as switching power supplies, air conditioners, oil generators, batteries, and high and low voltage power distributions of distributed industrial and residential communities in real time, and diagnoses and deals with faults, records, and Analyze the relevant data so as to achieve the goal of little or no-maintenance, and conduct centralized monitoring, centralized maintenance, and centralized management of the equipment. The previous way is: 1. Connect each collection point through the serial bus of RS-485 and connect it with the serial port card and the PC of the monitoring center through the interface converter. If a device on the bus fails, the entire system is paralyzed, and serial communication is used at the same time, the transmission speed is slow, and the transmission is error-prone. 2, the device can only provide 232 interfaces, a PC can only monitor one device, can not achieve centralized management of the device. Existing methods: 1. With the development of the network, the application of the IP network based on the TCP/IP protocol has been widely used. By using the serial port server device NP31X, the existing serial device is immediately connected to the Ethernet, and each of the serial network devices based on TCP/IP is realized. Point of real-time monitoring of equipment. To achieve safe, concise and effective transmission methods to achieve centralized and convenient management.