Conformance

Specification

The DLMS UA coloured books

The DLMS/COSEM specification is fully described in the DLMS UA coloured books:
- the Blue book describes the COSEM meter object model and the object identification system
- the Green book describes the three layer, connection oriented, HDLC based protocol stack to transport the model
- the Yellow book treats all the questions concerning conformance testing

The books are available for all members of the DLMS UA free of charge.
- Excerpts of the books are publicly available.
- Full versions of the colored books (for members only)

The specification became an International Standard for electricity, heat/cooling, gas and water metering.

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International standards for electricity metering

For electricity metering, IEC TC13 WG14 has established the IEC 62056 series of standards: Electricity metering - Data exchange for meter reading, tariff and load control.
- IEC 62056-42: Physical layer services and procedures for connection-oriented asynchronous data exchange
- IEC 62056-46: Data link layer using HDLC protocol
- IEC 62056-47: COSEM transport layers for IPv4 networks
- IEC 62056-53: COSEM Application layer
- IEC 62056-61: Object identification system (OBIS)
- IEC 62056-62: Interface classes
- In addition IEC 62056-21: Direct local data exchange (3d edition of IEC 61107) describes how to use COSEM over a local port (optical or current loop)

The standards can be purchased from the National Committees of the IEC or from the IEC Webstore directly.

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IS for heat/cooling, gas and water metering

For the metering of heat/cooling, gas and water metering, CEN TC 294 has established the International Standard EN13757-1: Communication system for and remote reading of meters - Part 1: Data exchange

The standard can be bought from the National Committees of CEN.

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Maintenance of the DLMS/COSEM specification

The DLMS UA regularly maintains the specification to meet new requirements and to incorporate practical experience gathered by using the specification.
Any user of the DLMS/COSEM specification may propose an amendment.

- Proposed amendments are discussed and approved by the Working Group Maintenance
- Approved amendments are regularly added to the DLMS UA coloured books
- DLMS UA books - corrigenda

IEC and CEN standards are amended according to their maintenance schedule.

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Questions and Answers

Find Questions and Answers concerning the DLMS/COSEM specification.

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