The DDZY121-A 2-level single-phase local cost control intelligent energy meter (remote/switch built-in) is an intelligent metering product that integrates carrier communication, energy metering, and CPU card local cost control. It can be combined with a concentrator and management system to form a centralized meter reading system, completing long-distance transmission of metering data and power on/off control. The performance indicators of this product meet the requirements GB/T17215.321-2008，GB/T17215.301-2007，DL/T698.1-2009，DL/T645-2007，Q/GDW364-2009 Waiting for the State Grid Corporation of China's relevant standards for smart energy meters.

The Level 2 single-phase remote cost control intelligent energy meter has positive and negative active energy metering functions and can store its data;

It has a complete multi rate settlement and billing function, and can set two sets of time periods, each set of time periods can set four rates;

Support modifying rate and time slot tables through infrared and RS485 communication interfaces;

The Level 2 single-phase remote cost control intelligent energy meter can read and remotely control the data of the energy meter through the 485 communication interface.