Adopt high-performance, low-power AVR 8-bit microprocessor ATmega64 as MCU; complete the conversion between low-voltage power line carrier (or micro-power wireless) and RS485 communication; realize the communication between carrier (or micro-power wireless) concentrator and downstream electric energy meter; support the concentrator to read all data of electric energy meter, broadcast time calibration, switch control and other instructions forwarding; automatically collect and store electric energy meter data