Concentrator is a key device in the Kuanteng centralized meter reading system. It can automatically copy and store energy consumption data collected from various intelligent instruments and communication terminals through power line communication functions, and can collect external 485 meter data. Its downstream channel is RS-485 communication: its upstream channel uses a public communication network, supports two communication modes of client and server, and adopts modular design. The communication mode can be directly changed by replacing the communication module.