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IEC 62056-21 Ed. 1.0 b:2002

Electricity metering - Data exchange for meter reading, tariff and load control - Part 21: Direct local data exchange

Describes hardware and protocol specifications 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.

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International Electrotechnical Commission [iec]

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