BS EN BRITISH STANDARD 60870-5-103: 1998 IEC 60870-5-103: 1997 Telecontrol equipment and systems Part 5-103: Transmission protocols : Companion standard for the informative interface of protection equipment The European Standard EN 60870-5-103:1998 has the status of a British Standard ICS 33.200 BSi NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAW BS EN 60870-5-103:1998 National foreword This British Standard is the English language version of EN 60870-5-103:1998. It is identical with IEC 60870-5-103:1997. The UK participation in its preparation was entrusted to Technical Committee PEL/57, Power systems control and associated communications, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; - monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annexwhichlists normativereferencestointernational publications with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled "International Standards Correspondence Index", or by using the “Find" facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not ofitself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and i, the EN title page, pages 2 to 92 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. This British Standard, having Amendments issued since publication been prepared under the direction of the Amd. No. Date Comments Electrotechnical Sector Board, was published underthe authority of the Standards Board and comes into effect on 15April 1998 CBSI07-1999 ISBN0580297713 BS EN 60870-5-103:1998 Contents Page National foreword Inside front cover Foreword 2 Text of EN 60870-5-103 5- CBSI 07-1999 1