BS EN 62056-21:2002
Electricity metering - Data exchange for meter reading, tariff and load control - Direct local data exchange

Standard No.

BS EN 62056-21:2002

Release Date

2002

Published By

British Standards Institution (BSI)

Latest

BS EN 62056-21:2002

Replace

00/201323 DC-2001 BS EN 61107:1996

Scope

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 HHU. 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 and application are left to the user. This standard is based on the reference model for communication in open systems. It is enhanced by further elements such as an optical interface, protocol controlled baud rate switchover, data transmission without acknowledgement of receipt. The protocol offers several modes for implementation in the tariff device. The HHU or equivalent unit acts as a master while the tariff device acts as a slave in protocol modes A to D. In protocol mode E, the HHU acts as a client and the tariff device acts as a server. As several systems are in practical use already, particular care was taken to maintain compatibility with existing systems and/or system components and their relevant protocols.

BS EN 62056-21:2002 history

• 2002 BS EN 62056-21:2002 Electricity metering - Data exchange for meter reading, tariff and load control - Direct local data exchange