ISO/IEC INTERNATIONAL STANDARD 21471 First edition 2020-02 Information technology Automatic identification and data capture techniques Extended rectangular data matrix (DMRE) bar code symbology specification Technologies de I'information - Techniques de I'identification et de saisie de données automatiques - Data Matrix Rectangulaire Etendu (DMRE) spécification de symbologie de code a barres Reference number IS0/IEC 21471:2020(E) IEC @IS0/IEC2020 IS0/IEC 21471:2020(E) COPYRIGHTPROTECTEDDOCUMENT IS0/IEC2020 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting onthe internet or an intranet, without prior writtenpermission.Permission can be requested from either Iso at the address below or Iso's memberbody in the country ofthe requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +4122 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii IS0/IEC2020-Allrightsreserved IS0/IEC 21471:2020(E) Contents Page Foreword ..V Introduction. ..vi 1 Scope. .1 2 Normative references 1 3 Terms, definitions, symbols and abbreviated terms and mathematical/logical notations...1 3.1 Terms and definitions. 1 .2 3.2 Symbols and abbreviated terms 3.3 Mathematical/logical notations. 2 4 Symbol description. .2 .2 4.1 Basic characteristics. 4.2 Summary of additional features .3 ..3 4.3 Symbol structure 4.3.1 General. 3 4.3.2 Finder pattern .4 4.3.3 Symbol sizes and capacities 4 DMRE code requirements ..4 5 5.1 Encoding procedure overview. .4 5.2 Data encodation. .5 5.2.1 Overview 5 5.2.2 Default character interpretation .5 5.2.3 ASCII encodation .5 5.2.4 Symbology control characters. 6 5.2.5 C40 encodation. .8 5.2.6 Text encodation. .9 5.2.7 ANSI X12 encodation. 9 5.2.8 EDIFACT encodation. .10 5.2.9 Base 256 encodation. .11 5.3 User considerations. .12 5.3.1 General. .12 5.3.2 User selection of extended channel interpretation. .12 5.3.3 User selection of symbol size and shape. .12 5.4 Extended channel interpretation .12 5.4.1 General. .12 5.4.2 Encoding ECIs.. .12 5.4.3 ECIs and Structured append .13 Post-decode protocol. 5.4.4 ..13 5.5 DMRE code symbol attributes. .13 5.5.1 Symbol sizes and capacity .13 5.5.2 Insertion ofalignmentpatterns intolarger symbols .14 5.6 Structured append. .14 5.6.1 Basic principles. .14 5.6.2 Symbol sequence indicator. ..14 5.6.3 File identification ..15 5.6.4 FNC1 and Structured append .15 5.6.5 Buffered and unbuffered operation .15 5.7 Error detection and correction .16 5.7.1 Reed-Solomon error correction. ..16 5.7.2 Generating the error correction codewords .16 5.7.3 Error correction capacity .17 5.8 Symbol construction. .17 5.8.1 General. ..17 Symbol character placement. 5.8.2 .17 iii IS0/IEC2020-Allrightsreserved