The concentrator is a key device in the centralized meter reading system.It can automatically collect and store various data of various intelligent meters, collection terminals or collectors with communication functions through downlink micropower wireless communication, and can communicate with the master station through uplink communication. It exchanges data and issues or transfers various commands from the master station. The uplink interface of the concentrator supports GPRS fixed IP, GPRS non-fixed IP, 232 serial port, and Ethernet mode.