ISO/IEC 21471
(Main)Information technology — Automatic identification and data capture techniques — Data Matrix Rectangular Extension (DMRE) bar code symbology specification
Information technology — Automatic identification and data capture techniques — Data Matrix Rectangular Extension (DMRE) bar code symbology specification
This document defines the requirements for the symbology known as extended rectangular data matrix (DMRE). It specifies the DMRE code symbology characteristics, data character encodation, symbol formats, dimensions and print quality requirements, error correction rules, decoding algorithm, and user-selectable application parameters. It applies to all DMRE code symbols produced by any printing or marking technology. Original data matrix code sizes are not covered by this document but defined in ISO/IEC 16022 using the same matrix placement, decoding and error correction algorithm.
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Information technology —
Automatic identification and data
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Rectangular Extension (DMRE) bar
code symbology specification
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© ISO/IEC 2025
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 on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
PROOF/ÉPREUVE
© ISO/IEC 2025 – All rights reserved
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Symbol description. 2
5.1 Basic characteristics .2
5.2 Summary of additional features .3
5.3 Symbol structure .3
5.3.1 General .3
5.3.2 Finder pattern .3
5.3.3 Symbol sizes and capacities .3
6 DMRE requirements . 4
6.1 Encoding procedure overview .4
6.1.1 General .4
6.1.2 Step 1: data encodation .4
6.1.3 Step 2: error checking and correcting codeword generation .4
6.1.4 Step 3: module placement in matrix.4
6.2 DMRE symbol attributes .4
6.2.1 Symbol sizes and capacity .4
6.2.2 Insertion of alignment patterns into larger symbols .5
6.3 Structured append .5
6.4 Error detection and correction .5
6.5 Symbol construction .5
6.5.1 General .5
6.5.2 Symbol character placement .5
6.5.3 Alignment pattern module placement .6
6.5.4 Finder pattern module placement .6
7 Symbol dimensions . 6
8 Symbol quality . 6
9 Reference decode algorithm for DMRE . 7
10 User guidelines . 7
10.1 Human readable interpretation .7
10.2 Autodiscrimination capability .7
10.3 System considerations .7
11 Transmitted data . 7
Annex A (informative) DMRE alignment patterns . 8
Annex B (normative) Error correction codeword generator polynomials . 9
Annex C (informative) Symbol character placement .12
Annex D (normative) Symbology identifier . 14
Annex E (informative) Encode example .15
Annex F (informative) Autodiscrimination capability .18
Annex G (informative) System considerations . 19
Bibliography .20
PROOF/ÉPREUVE
© ISO/IEC 2025 – All rights reserved
iii
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations,
governmental and non-governmental, in liaison with ISO and IEC, also take part in the work.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of document should be noted. This document was drafted in accordance with the editorial rules of the ISO/
IEC Directives, Part 2 (see www.iso.org/directives or www.iec.ch/members_experts/refdocs).
ISO and IEC draw attention to the possibility that the implementation of this document may involve the
use of (a) patent(s). ISO and IEC take no position concerning the evidence, validity or applicability of any
claimed patent rights in respect thereof. As of the date of publication of this document, ISO and IEC had not
received notice of (a) patent(s) which may be required to implement this document. However, implementers
are cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents and https://patents.iec.ch. ISO and IEC shall not be held
responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www.iso.org/iso/foreword.html.
In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 31, Automatic identification and data capture techniques.
This second edition cancels and replaces the first edition (ISO/IEC 21471:2020), which has been technically
revised.
The main changes are as follows: information duplicated from ISO/IEC 16022 has been removed
Any feedback or questions on this document should be directed to the user’s national standards
body. A complete listing of these bodies can be found at www.iso.org/members.html and
www.iec.ch/national-committees.
PROOF/ÉPREUVE
© ISO/IEC 2025 – All rights reserved
iv
Introduction
Data Matrix Rectangular Extension (DMRE) is a two-dimensional matrix symbology which is made up
of nominally square modules arranged within a perimeter finder pattern. Though primarily shown and
described in this document as a dark symbol on light background, Data Matrix Rectangular Extension
symbols can also be printed to appear as light on dark.
This document is an extension of ISO/IEC 16022, to which it adds rectangular formats. Maximum
compatibility is a design goal. This document only describes the required extension. Common properties are
not repeated. It is a long time goal to join those documents, when DMRE is widely adopted.
This document is published separately because existing equipment supporting ISO/IEC 16022 will not
recognize DMRE symbols. Only equipment that is enabled and configured to support DMRE will be capable
of printing and scanning the new rectangular formats.
Manufacturers of bar code equipment and users of the technology require publicly available standard
symbology specifications to which they can refer when developing equipment and application standards.
The publication of standardized symbology specifications is designed to achieve this.
PROOF/ÉPREUVE
© ISO/IEC 2025 – All rights reserved
v
International Standard ISO/IEC 21471:2025(en)
Information technology — Automatic identification and data
capture techniques — Data Matrix Rectangular Extension
(DMRE) bar code symbology specification
1 Scope
This document defines the requirements for the symbology known as Data Matrix Rectangular Extension
(DMRE
...
ISO/IEC DIS PRF 21471:2024(en)
ISO/IEC JTC 1/SC 31
Secretariat: ANSI
Date: 2025-02-20
Information technology — Automatic identification and data
capture techniques — Data Matrix Rectangular Extension (DMRE)
bar code symbology specification
Technologies de l'information – Techniques de l'identification et de saisie de données automatiques – Data
Matrix Rectangulaire Etendu (DMRE) spécification de symbologie de code à barres
Second edition
Date: 2024-05-31
FDIS stage
© ISO/IEC 2020 – All rights reserved
ISO/IEC PRF 21471:2025(en)
© ISO/IEC 2024 2025
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 on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO'sISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: E-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland.
© ISO/IEC 2025 – All rights reserved
iii
ISO/IEC PRF 21471:2025(en)
Contents Page
Foreword . v
Introduction . vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 1
5 Symbol description . 2
5.1 Basic characteristics . 2
5.2 Summary of additional features . 3
5.3 Symbol structure . 3
6 DMRE requirements. 4
6.1 Encoding procedure overview . 4
6.2 DMRE symbol attributes . 4
6.3 Structured append . 6
6.4 Error detection and correction . 6
6.5 Symbol construction . 6
7 Symbol dimensions . 7
8 Symbol quality . 8
9 Reference decode algorithm for DMRE . 8
10 User guidelines . 8
10.1 Human readable interpretation . 8
10.2 Autodiscrimination capability . 8
10.3 System considerations . 8
11 Transmitted data . 8
Annex A (informative) DMRE alignment patterns . 9
Annex B (normative) Error correction codeword generator polynomials . 10
Annex C (informative) Symbol character placement . 13
Annex D (normative) Symbology identifier. 16
Annex E (informative) Encode example. 17
Annex F (informative) Autodiscrimination capability . 21
Annex G (informative) System considerations . 22
Bibliography . 23
© ISO/IEC 2025 – All rights reserved
iv
ISO/IEC PRF 21471:2025(en)
Foreword
© ISO/IEC 2025 – All rights reserved
v
ISO/IEC PRF 21471:2025(en)
Foreword.
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are members
of ISO or IEC participate in the development of International Standards through technical committees
established by the respective organization to deal with particular fields of technical activity. ISO and IEC
technical committees collaborate in fields of mutual interest. Other international organizations, governmental
and non-governmental, in liaison with ISO and IEC, also take part in the work.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
document should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC
Directives, Part 2 (see www.iso.org/directives or www.iec.ch/members_experts/refdocs).
ISO and IEC draw attention to the possibility that the implementation of this document may involve the use of
(a) patent(s). ISO and IEC take no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO and IEC [had/had not]
received notice of (a) patent(s) which may be required to implement this document. However, implementers
are cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents and https://patents.iec.ch. ISO and IEC shall not be held
responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www.iso.org/iso/foreword.html.
In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 31, Automatic identification and data capture techniques.
This second edition cancels and replaces the first edition (ISO/IEC 21471:2020), which has been technically
revised.
The main changes are as follows: information duplicated from ISO/IEC 16022 has been removed
— — Document depends on ISO/IEC 16022 and only shows the difference. The prior version was a stand-
alone document. This version is dependent upon ISO/IEC 16022 and does not include duplicate
information.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html and www.iec.ch/national-
committees.
© ISO/IEC 2025 – All rights reserved
vi
ISO/IEC PRF 21471:2025(en)
Introduction
Data Matrix Rectangular Extension (DMRE) is a two-dimensional matrix symbology which is made up of
nominally square modules arranged within a perimeter finder pattern. Though primarily shown and
described in this document as a dark symbol on light background, Data Matrix Rectangular Extension symbols
can also be printed to appear as light on dark.
This document is an extension of ISO/IEC 16022, to which it adds rectangular formats. Maximum compatibility
is a design goal. This document only describes the required extension. Common properties are not repeated.
It is a long time goal to join those documents, when DMRE is widely adopted.
This document is published separately because existing equipment supporting ISO/IEC 16022 will not
recognize DMRE symbols. Only equipment that is enabled and configured to support DMRE will be capable of
printing and scanning the new rectangular formats.
Manufacturers of bar code equipment and users of the technology require publicly available standard
symbology specifications to which they can refer when developing equipment and application standards. The
publication of standardized symbology specifications is designed to achieve this.
© ISO/IEC 2025 – All rights reserved
vii
ISO/IEC PRF 21471:2025(en)
Information technology – — Automatic identification and data capture
techniques — Data Matrix Rectangular Extension (DMRE) bar code
symbology specification
1 Scope
This document defines the requirements for the symbology known as extended rectangular data matrixData
Matrix Rectangular Extension (DMRE). This document specifies the DMRE code symbology characteristics,
data character encodation, symbol formats, dimensions and print quality requirements, error correction rules,
decoding algorithm, and user-selectable application parameters.
This document applies to all DMRE code symbols produced by any printing or marking technology.
Original Data Matrix code sizes are not covered by this document but defined in ISO/IEC 16022 using the same
matrix placement, decoding and error correction algorithm.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO/IEC 15415, Automatic identification and data capture techniques — Bar code symbol print quality test
specification — Two-dimensional symbols
ISO/IEC 16022, Information technology — Automatic identification and data capture techniques — Data Matrix
bar code symbology specification
ISO/IEC 15415, Information technology — Automatic identification and data capture techniques — Bar code
symbol print quality test specification — Two-dimensional symbols
ISO/IEC 19762, Information technology — Automatic identification and data capture (AIDC) techniques —
Harmonized vocabulary
ISO/IEC 29158, Information technology — Automatic identification and data capture techniques — Direct Part
Mark (DPM) Quality Guideline
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/IEC 19762 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— — ISO Online browsing platform: available at https://www.iso.org/obp
— — IEC Electropedia: available at https://www.electropedia.org/
4 Symbols
e number of erasures
k total number of error correction codewords
© ISO/IEC 2025 – All rights reserved
ISO/IEC PRF 21471:2025(en)
n total number of data codewords
N the numerical base in an encodation scheme
p number of codewords reserved for error detection
S symbol character
t number of errors
X horizontal and vertical width of a module
ε error correction codeword
5 Symbol description
5.1 Basic characteristics
DMRE is a two-dimensional matrix symbology. It is an extension of the ISO/IEC 16022 Data Matrix symbology.
The characteristics of DMRE are:
a) a) An encodable character set of:
1) 1) values 0 to 127 in accordance with according to the ISO/IEC 646 (International Reference
[2 ]
Version) IRV, [2], i.e. all 128 ASCII characters;
2) 2) values 128 to 255 in accordance withaccording to ISO/IEC 8859-1 (these are referred to as
extended ASCII);
3) 3) additional characters can be encoded using the ECI capabilities.
b) b) Representation of data:Data is represented as a dark module is afor the binary one and a light module
is afor zero.
This document specifies DMRE symbols in terms of dark modules marked on a light background.
However, 5.25.2 provides indicates that symbols may also be produced with the module’s colours
reversed. In such symbols, dark modules would be a binary zero, and light modules would be a binary
one.
c) c) The symbo
...
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