BS EN 1649-2004 AIDC technologies - Operational aspects affecting the reading of bar code symbols《AIDC技术 影响条形码符号读取的操作方面》.pdf

1、BRITISH STANDARD BS EN 1649:2004 AIDC technologies Operational aspects affecting the reading of bar code symbols The European Standard EN 1649:2004 has the status of a British Standard ICS 35.040 BS EN 1649:2004 This British Standard was published under the authority of the Standards Policy and Stra

2、tegy Committee on 25 August 2004 BSI 25 August 2004 ISBN 0 580 44345 0 National foreword This British Standard is the official English language version of EN 1649:2004. It supersedes DD ENV 1649:1996, which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee IS

3、T/34, Automatic identification and data capture techniques, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in

4、 this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a

5、 contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or propos

6、als for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 20, an inside back cover and a back cover. The BSI c

7、opyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN1649 August2004 ICS35.040 SupersedesENV1649:1995 Englishversion AIDCtechnologiesOperationalaspectsaffecti

8、ngthereadingof barcodesymbols Techniquesdidentificationautomatiqueetdesaisiedes donnesAspectsdemiseenoeuvreaffectantlalecture dessymbolesencodesbarres AutoIDTechnologienEinflussgrenaufdieLesungvon Strichcodes ThisEuropeanStandardwasapprovedbyCENon14July2004. CENmembersareboundtocomplywiththeCEN/CENE

9、LECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinth

10、reeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark

11、,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG Managem

12、entCentre:ruedeStassart,36B1050Brussels 2004CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN1649:2004:EEN 1649:2004 (E) 2 Contents Foreword . 3 1 Scope. 5 2 Normative references 5 3 Terms and definitions 6 4 Requirements . 6 4.1 Closed or open syste

13、m . 6 4.2 Pre-existing standards 6 4.3 Data to be encoded. 7 4.4 Symbology selection . 8 4.5 Optical Parameters . 11 4.6 Symbol quality. 13 4.7 Symbol Application 13 4.8 Labels 13 4.9 Positioning of the Symbols 14 4.10 Environmental Conditions . 14 4.11 Health and Safety Considerations. 15 4.12 Glob

14、al Environmental Considerations. 15 Annex A (informative) Symbology character sets . 16 Annex B (informative) Symbology features 18 Bibliography 20 EN 1649:2004 (E) 3 Foreword This document (EN 1649:2004) has been prepared by Technical Committee CEN/TC 225, “Bar coding“, the secretariat of which is

15、held by NEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2005, and conflicting national standards shall be withdrawn at the latest by February 2005. According to the CEN/CENELEC Inter

16、nal Regulations, the national standards organizations of the following countries are bound to implement this European Standard : Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Nethe

17、rlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. This document supersedes ENV 1649:1995 EN 1649:2004 (E) 4 Introduction Implementation of the technology of bar coding requires the originators of the bar code marking, and those wishing to make use o

18、f the bar codes to capture data relating to the marked entity automatically, to work to a common application standard. The application standard may make reference to publicly available specifications for the underlying technical aspects of the bar code symbol and of the equipment for its production

19、and reading. By means of such publicly available standards, the producers of symbols and those wishing to read the symbols can be aware of the requirements which must be met by any symbol production and symbol reading equipment which they specify for their respective systems. This document also prov

20、ides the manufacturers of both bar code marking and bar code reading equipment with the requirements to which that equipment must comply, for that application. This document provides the means by which bodies which are making application standards for industries can ensure that all relevant technica

21、l requirements are addressed during the standards making process. EN 1649:2004 (E) 5 1 Scope This document specifies the operational aspects affecting the reading of bar code symbols which must be considered in the preparation of application standards. It defines the subjects which must be addressed

22、 by application standards if they are to provide practical guidance to the user industries for whose use they are developed. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For und

23、ated references, the latest edition of the referenced document (including any amendments) applies. EN 1556:1998, Bar Coding Terminology. EN 1573, Bar Coding Multi-industry transport label. EN 12323, Bar coding Symbology specification “Code 16k”. EN ISO/IEC 15416, Information technology - Automatic i

24、dentification and data capture techniques - Bar code print quality test specification - Linear symbols (ISO/IEC 154 16:2000). EN ISO/IEC15438 Information technology - Automatic identification and data capture techniques - Bar code symbology specifications - PDF4 17 (ISO/IEC 15438:200 1). ISO/IEC 646

25、:1991, Information technology ISO 7-bit coded character set for information interchange. ISO/IEC 88591:1998 Information technology 8-bit single-byte coded graphic character sets Part 1: Latin alphabet No. 1. ISO/IEC 15415 Information technology Automatic identification and data capture techniques Ba

26、r code print quality test specification Two dimensional symbols. ISO/IEC 15418 Information technology - EAN/UCC Application Identifiers and Fact Data Identifiers and Maintenance. ISO/IEC 15420 Information technology Automatic identification and data capture techniques Bar code symbology specificatio

27、n EAN/UPC. ISO/IEC 15424 Information technology Automatic identification and data capture techniques Data Carrier Identifiers (including Symbology Identifiers). ISO/IEC 16022, Information technology - International symbology specification - Data matrix. ISO/IEC 16023, Information technology - Intern

28、ational symbology specification MaxiCode. ISO/IEC 16390 Information technology Automatic identification and data capture techniques Bar code symbology specifications Interleaved 2 of 5. ISO/IEC 18004 Information technology-Automatic identification and data capture techniques Barcode symbology QR Cod

29、e. General EAN UCC Specifications (EAN International, Brussels, 2004). EN 1649:2004 (E) 6 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1556:1998 and the following apply. 3.1 closed system application which is intended for use by a closed group of u

30、sers, typically within a single organisation or subject to a specific agreement. NOTE Existing closed systems are used subject to bilateral agreement between the participants. 3.2 open system application in which independent parties may freely participate and in which bilateral agreements are not ne

31、cessary 3.3 application standard specification defining the method by which and conditions under which automatic identification and data capture technology may be applied to a particular purpose, prescribing, for example, data formats, optical requirements and symbology related parameters as subsets

32、 of the total range defined by relevant technical standards 4 Requirements 4.1 Closed or open system The developer of a standard shall determine if the system to which the application standard applies is a closed or an open system. 4.2 Pre-existing standards Before commencing the making of a new app

33、lication standard, careful consideration should be given to the potential of adopting an existing standard. Many currently used application standards are readily adaptable to specific industry uses whilst remaining totally compatible with their existing uses. Broadening the scope of existing interna

34、tional, multi industry standards, provides for the ready trading of bar code marked items internationally and between industry sectors and is, therefore, the preferred option. It should be noted that the proliferation of standards is a waste of resources and is contrary to the principles of standard

35、isation. EN 1649:2004 (E) 7 4.3 Data to be encoded 4.3.1 Type of Data to be Encoded The choice of symbology will be influenced by the type of data to be encoded; which can be: numeric alphanumeric ASCII other character sets which, particularly in high capacity two dimensional symbologies, may be acc

36、essed by the use of the AIM : ECI Part 1. Annex A includes details of those symbologies which support this standard. The character set required to encode the data content shall be a subset of the encodable character set of the symbology. There are symbologies covered by European and International St

37、andards, the encodable character set of which meet all these requirements. For a given application, the character set used may be a limited part of the total character set available. NOTE The character sets encodable by symbologies covered by European or International Standards are described in anne

38、x A. 4.3.2 Data string length 4.3.2.1 Linear symbols The data string length to be encoded will influence the length of linear bar code symbols. The specification of long data strings, and the resultant long symbols, may be the cause of symbols being difficult to scan with a high degree of reliabilit

39、y and ease. It will also limit the choice of bar code printing and reading systems which may be used for a particular application. In particular some types of bar code readers may have limitations in the data string length which may be decoded and transmitted to the host system. 4.3.2.2 Two dimensio

40、nal symbols For some applications the data string length to be encoded may exceed that which can be encoded in a linear symbol. In such cases high capacity two dimensional multi-row bar code or matrix symbols can be used. In their largest sizes these may permit up to two thousand characters of data

41、to be encode in a symbol. Some two dimensional symbologies permit the decoded data from more than one symbol to be concatenated into a single data string, thus enabling very large amounts of data to be encoded in a set of symbols. 4.3.3 Data check characters For applications where key entry is used,

42、 or where data security is critical, data check characters as distinct from symbol check characters should be used. The system of data check characters used will depend upon the application, a suitable algorithm may be selected from those described in ISO/IEC 7064. EN 1649:2004 (E) 8 4.4 Symbology s

43、election 4.4.1 General When selecting a symbology or symbologies for any particular application every aspect of the application should be considered. The symbology which is specified for use in an application standard, should be one of those symbologies covered by European or International Standards

44、. NOTE Annex B compares the features of two dimensional symbologies standardised by CEN and ISO/IEC. 4.4.1.1 Linear symbols The following exceptional factors shall be taken into consideration during the selection of a symbology for an application. a) “EAN/UPC” Symbology (ISO/IEC 15420) This symbolog

45、y shall be used only in accordance with the EAN UCC General Specifications. b) “Interleaved 2 of 5” Symbology (ISO/IEC 16390) In Interleaved 2 of 5 symbols, the bar patterns of the start and stop patterns may be found as the respective end and beginning of certain encoded symbol characters within th

46、e symbol. There is therefore no guarantee that a partial scan of the symbol will not produce a valid read for an embedded symbol having fewer characters. Two additional measures should be applied to minimise the risk of such partial reads, fixing the symbol length and applying bearer bars: 1) Fixed

47、length symbols In any application standard the number of characters encoded in an Interleaved 2 of 5 symbol should be fixed, and reading or data processing equipment for that application should be programmed to accept only messages of that defined length. 2) Bearer bars The purpose of bearer bars is

48、 to reduce the probability of a valid but erroneous short read of the symbol where a scanning beam enters and/or leaves the symbol at the top or bottom. Bearer bars should be added unless technical constraints prevent it or unless the reading or data processing equipment is programmed for fixed length symbols. In open system applications where a wide range of reading environments will be encountered, bearer bars should be applied as a default measure to prevent short reads. Bearer bars when used should be placed perp