Most recent
DIN EN 62056-21:2003
Electricity metering - Data exchange for meter reading, tariff and load control - Part 21: Direct local data exchange (IEC 62056-21:2002); German version EN 62056-21:2002, text in English
This standard describes hardware and protocol specifiations for local meter data exchange. In such systems, a hand-held unit (HHU) or a unit with equivalent functions is connected to a tariff device or a group of devices.
Deutsches Institut für Normung [din]