IEC 62056-21 (DLMS) driver for Niagara allows it to establish connection to the meter, discover all its data points with OBIS identifiers and then periodically read their values. That could be a simple and effective way to get real-time and historical values (kWh, kW, kVA, kVAr, V, I, pF etc.) from the main utility electrical meters into a building management system or an energy monitoring system. These values, along with sub-metering values retrieved from Modbus meters, can then be analyzed, shown on dashboards, used for cost prediction and building performance metrics.
IEC 62056-21 is a communication protocol often used by energy suppliers in their energy meters – mostly for electricity, but also for thermal and gas meters (as per EN 1434-3 standard). This protocol is included in IEC 62056 – family of standards maintained by International Electrotechnical Commission for electricity metering data exchange. It is a part of the “smart grid” suite of protocols and it is included into DLMS/COSEM specification.
IEC 62056-21 electrical meters usually are different from 96x96 and DIN-rail electrical meters with Modbus protocol. Utility meters are bigger in size, have a restricted access to configuration parameters and very limited user interface – they often have just a single button to switch between few values on the screen. Instead they are equipped with an optical probe interface, allowing energy suppliers to connect to the meters in a fast and safe manner temporarily.
Communicates with meters supporting IEC62056-21 (DLMS) protocol
Works via RS-485, RS-232, IP, optical head, current loop (with adapters)
Supports electrical, thermal energy and gas meters
Allows point discovery
Automatically determines point name, type and units
Supports periodical point polling
Great solution for existing non-Modbus electrical meters
All IEC62056-21 meters
Niagara-powered device with software v3.8 (AX), v4.1 (N4) or later, including Jace8000, Supervisor or their OEM versions
Jace 8000 250 points / 1000 points / unlimited points
Supervisor 500 points + any number of extra 500 points
Niagara Supervisor or Jace is connected to meters via RS-485 / RS-232 ports (JACE) or IP (Supervisor or JACE).