Abstract： IEC 62056-21:2002 pdf free download.Electricity metering - Data exchange for meter reading,tariff and load control - Part 21: Direct local data exchange. This part of IEC 62056 describes hardware and protocol specifications for local meter...

IEC 62056-21:2002 pdf free download.Electricity metering - Data exchange for meter reading,tariff and load control - Part 21:

Direct local data exchange.

This part of IEC 62056 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.

The connection can be permanent or disconnectable using an optical or electrical coupling. An electrical interface is proposed for use with a permanent connection, or when more than one tariff device needs to be read at one site. The optical coupler should be

easily disconnectable to enable data collection via an HHLJ.

The protocol permits reading and programming of tariff devices, It is designed to be particularly suitable for the environment of

electricity metering, especially as regards electrical isolation and data security. While the protocol is well-defined, its use end application are left to the user.

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