BS EN 62056-7-6. Electricity metering data exchange. The DLMS/COSEM suite. Part 7-6. The 3-layer, connection-oriented HDLC based communication profile Electrical equipment, Meters, Electricity supply meters, Data transfer, Data handling, Interfaces (data processing), Power control (electric), Information exchange, Computer hardware, Data processing equipment, Data transmission, Data transmission control procedures, Data blocks, Coding (data conversion), Data acquisition, Electrical measurement, Circuits, Open systems interconnection