ISO 11992-1:2019
(Main)Road vehicles — Interchange of digital information on electrical connections between towing and towed vehicles — Part 1: Physical and data-link layers
Road vehicles — Interchange of digital information on electrical connections between towing and towed vehicles — Part 1: Physical and data-link layers
This document describes the data link layer (DLL) and physical layer (PHY) for the two CAN-based network interfaces specified in the 11992-series. The DLL sub-clauses are composed of: — DLL protocol entity requirements; — DLL device interface requirements; and — DLL network system requirements. Normally, the physical signalling sub-layer is implemented in the CAN protocol controller. The physical medium attachment sub-layer is normally implemented in the CAN transceiver or the System Base Chip (SBC). Optionally, it can comprise also additional protection circuitry. The media-dependent sub-layer comprises the connectors and the cabling. The physical signalling (PS) sub-clauses are composed of: — PS entity requirements; — PS device interface requirements; and — PS network system requirements. The physical medium attachment (PMA) sub-clauses are composed of: — PMA protocol entity requirements; and — PMA device interface requirements. The physical medium dependent (PMD) sub-clauses are composed of: — PMD entity requirements; — PMD device interface requirements; and — PMD network system requirements.
Véhicules routiers — Échange d'informations numériques sur les connexions électriques entre véhicules tracteurs et véhicules tractés — Partie 1: Couche physique et couche de liaison de données
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INTERNATIONAL ISO
STANDARD 11992-1
Third edition
2019-05
Road vehicles — Interchange of digital
information on electrical connections
between towing and towed vehicles —
Part 1:
Physical and data-link layers
Véhicules routiers — Échange d'informations numériques sur
les connexions électriques entre véhicules tracteurs et véhicules
tractés —
Partie 1: Couche physique et couche de liaison de données
Reference number
©
ISO 2019
© ISO 2019
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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 4
5 Data link layer (DLL) . 4
5.1 General . 4
5.2 DLL protocol entity requirements . . 4
5.3 DLL device interface requirements . 4
6 Physical layer (PHY) . 5
6.1 General . 5
6.2 Physical signalling (PS) requirements . 5
6.2.1 General. 5
6.2.2 PS entity requirements . 5
6.2.3 PS device interface requirements. 5
6.3 Physical medium attachment (PMA) requirements . 6
6.3.1 PMA entity requirements . 6
6.3.2 PMA device interface requirements .13
6.4 Physical media dependent (PMD) sub-layer requirements .14
6.4.1 PMD entity requirements .14
6.4.2 PMD device interface requirements .14
6.5 Network wiring harness system requirements .16
Annex A (informative) Implementation examples of the bus failure management .20
Bibliography .22
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
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 ISO documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
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.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 31,
Data communication.
This third edition cancels and replaces the second edition (ISO 11992-1:2003) which has been
technically revised.
The main changes compared to the previous edition are as follows:
— wording improvements and clarifications;
— introduction of requirement statements; and
— addition of informative Annex A, Implementation examples of the bus failure management.
A list of all parts in the ISO 11992 series can be found on the ISO website.
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.
iv © ISO 2019 – All rights reserved
Introduction
The ISO 11992 series specifies the interchange of digital information between road vehicles with a
maximum authorised total mass greater than 3 500 kg. The series also specifies digital information
interchange for towed vehicles, including communication between towed vehicles in terms of
parameters and requirements of the lower OSI layers (physical and data link layer) of the electrical
connection used to connect the electrical and electronic systems.
This document specifies the data link and physical layer requirements of the CAN communication bus
between towing and towed vehicles.
This document has been structured according to the Open Systems Interconnection (OSI) Basic
Reference Model, in accordance with ISO/IEC 7498-1 and ISO/IEC 10731, which structures
communication systems into seven layers. When mapped on this model, the application protocol and
data link layer framework requirements specified/referenced in a ISO 11992 series standard are
structured according to Figure 1.
Figure 1 illustrates the following communication frameworks:
— normal vehicle communication framework;
— vehicle diagnostic communication framework;
— vehicle-specific use case framework; and
— vehicle lower-layers framework.
The normal vehicle communication framework is composed of ISO 11992-2 and ISO 11992-3.
[3] [12]
The vehicle diagnostic communication framework is composed of ISO 14229-1 , ISO 14229-2 ,
[13] [3]
ISO 14229-3 and ISO 11992-4 .
The vehicle-specific use case framework is composed of ISO 11992-4, ISO 22901-1 or vehicle
manufacturer-specific diagnostic data definition.
[14] [6]
The vehicle lower-layers framework is composed of ISO 15765-2 , ISO 11898-1, 1, ISO 7638-1 and
[10]
ISO 12098 .
Figure 1 — Towing and towed vehicles framework documents reference according to the OSI
model
Figure 2 shows the implementation example of the lower-layers block diagram.
vi © ISO 2019 – All rights reserved
Figure 2 — Implementation example of lower-layers block diagram
The above requirements structure has been chosen to provide the following developers with relevant
requirements:
— transceiver developers;
— device (e.g., electronic control unit) developers; and
— towing and towed vehicle network developers.
All requirements are numbered and headlined uniquely, so that each implementer can reference them.
INTERNATIONAL STANDARD ISO 11992-1:2019(E)
Road vehicles — Interchange of digital information
on electrical connections between towing and towed
vehicles —
Part 1:
Physical and data-link layers
1 Scope
This document describes the data link layer (DLL) and physical layer (PHY) for the two CAN-based
network interfaces specified in the 11992-series.
The DLL sub-clauses are composed of:
— DLL protocol entity requirements;
— DLL device interface requirements; and
— DLL network system requirements.
Normally, the physical signalling sub-layer is implemented in the CAN protocol controller. The physical
medium attachment sub-layer is normally implemented in the CAN transceiver or the System Base Chip
(SBC). Optionally, it can comprise also additional protection circuitry. The media-dependent sub-layer
comprises the connectors and the cabling.
The physical signalling (PS) sub-clauses are composed of:
— PS entity requirements;
— PS device interface requirements; and
— PS network system requirements.
The physical medium attachment (PMA) sub-clauses are composed of:
— PMA protocol entity requirements; and
— PMA device interface requirements.
The physical medium dependent (PMD) sub-clauses are composed of:
— PMD entity requirements;
— PMD device interface requirements; and
— PMD network system requirements.
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 4141-1, Road vehicles — Multi-core connecting cables — Part 1: Test methods and requirements for
basic performance sheathed cables
ISO 11898-1, Road vehicles — Controller area network (CAN) — Part 1: Data link layer and physical
signalling
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
1-wire operation
communication on either CAN_L or CAN_H with reference to ground and V potential during fault-
s
tolerant operation mode
3.2
2-wire operation
communication on CAN_L and CAN_H, with reference to ground and V potential, in nominal (non fault-
s
tolerant) operation mode
3.3
bus
communication link between two communication entities
3.4
CAN_H
CAN_L
particular cable and/or contact of the communication connection
3.5
differential transmission
transmission of digital information carried by voltage between the two conductors of the electrical
connections
3.6
maximum authorised total mass
vehicle mass determined as a maximum by the administrative authority for operating conditions laid
down by that authority
Note 1 to entry: In some jurisdictions this will be known as the Gross Vehicle Weight Rating or the Gross
Combination Weight Rating.
[SOURCE: ISO 1176:1990, 4.8, modified — NOTES 1 and 2 replaced by a new Note 1 to entry]
3.7
data link layer protocol entity
DLL protocol entity
functional part of the electronic component implementing the DLL protocol as standardised in
ISO 11898-1
...
INTERNATIONAL ISO
STANDARD 11992-1
Third edition
2019-05
Road vehicles — Interchange of digital
information on electrical connections
between towing and towed vehicles —
Part 1:
Physical and data-link layers
Véhicules routiers — Échange d'informations numériques sur
les connexions électriques entre véhicules tracteurs et véhicules
tractés —
Partie 1: Couche physique et couche de liaison de données
Reference number
©
ISO 2019
© ISO 2019
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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 4
5 Data link layer (DLL) . 4
5.1 General . 4
5.2 DLL protocol entity requirements . . 4
5.3 DLL device interface requirements . 4
6 Physical layer (PHY) . 5
6.1 General . 5
6.2 Physical signalling (PS) requirements . 5
6.2.1 General. 5
6.2.2 PS entity requirements . 5
6.2.3 PS device interface requirements. 5
6.3 Physical medium attachment (PMA) requirements . 6
6.3.1 PMA entity requirements . 6
6.3.2 PMA device interface requirements .13
6.4 Physical media dependent (PMD) sub-layer requirements .14
6.4.1 PMD entity requirements .14
6.4.2 PMD device interface requirements .14
6.5 Network wiring harness system requirements .16
Annex A (informative) Implementation examples of the bus failure management .20
Bibliography .22
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
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 ISO documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
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.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 31,
Data communication.
This third edition cancels and replaces the second edition (ISO 11992-1:2003) which has been
technically revised.
The main changes compared to the previous edition are as follows:
— wording improvements and clarifications;
— introduction of requirement statements; and
— addition of informative Annex A, Implementation examples of the bus failure management.
A list of all parts in the ISO 11992 series can be found on the ISO website.
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.
iv © ISO 2019 – All rights reserved
Introduction
The ISO 11992 series specifies the interchange of digital information between road vehicles with a
maximum authorised total mass greater than 3 500 kg. The series also specifies digital information
interchange for towed vehicles, including communication between towed vehicles in terms of
parameters and requirements of the lower OSI layers (physical and data link layer) of the electrical
connection used to connect the electrical and electronic systems.
This document specifies the data link and physical layer requirements of the CAN communication bus
between towing and towed vehicles.
This document has been structured according to the Open Systems Interconnection (OSI) Basic
Reference Model, in accordance with ISO/IEC 7498-1 and ISO/IEC 10731, which structures
communication systems into seven layers. When mapped on this model, the application protocol and
data link layer framework requirements specified/referenced in a ISO 11992 series standard are
structured according to Figure 1.
Figure 1 illustrates the following communication frameworks:
— normal vehicle communication framework;
— vehicle diagnostic communication framework;
— vehicle-specific use case framework; and
— vehicle lower-layers framework.
The normal vehicle communication framework is composed of ISO 11992-2 and ISO 11992-3.
[3] [12]
The vehicle diagnostic communication framework is composed of ISO 14229-1 , ISO 14229-2 ,
[13] [3]
ISO 14229-3 and ISO 11992-4 .
The vehicle-specific use case framework is composed of ISO 11992-4, ISO 22901-1 or vehicle
manufacturer-specific diagnostic data definition.
[14] [6]
The vehicle lower-layers framework is composed of ISO 15765-2 , ISO 11898-1, 1, ISO 7638-1 and
[10]
ISO 12098 .
Figure 1 — Towing and towed vehicles framework documents reference according to the OSI
model
Figure 2 shows the implementation example of the lower-layers block diagram.
vi © ISO 2019 – All rights reserved
Figure 2 — Implementation example of lower-layers block diagram
The above requirements structure has been chosen to provide the following developers with relevant
requirements:
— transceiver developers;
— device (e.g., electronic control unit) developers; and
— towing and towed vehicle network developers.
All requirements are numbered and headlined uniquely, so that each implementer can reference them.
INTERNATIONAL STANDARD ISO 11992-1:2019(E)
Road vehicles — Interchange of digital information
on electrical connections between towing and towed
vehicles —
Part 1:
Physical and data-link layers
1 Scope
This document describes the data link layer (DLL) and physical layer (PHY) for the two CAN-based
network interfaces specified in the 11992-series.
The DLL sub-clauses are composed of:
— DLL protocol entity requirements;
— DLL device interface requirements; and
— DLL network system requirements.
Normally, the physical signalling sub-layer is implemented in the CAN protocol controller. The physical
medium attachment sub-layer is normally implemented in the CAN transceiver or the System Base Chip
(SBC). Optionally, it can comprise also additional protection circuitry. The media-dependent sub-layer
comprises the connectors and the cabling.
The physical signalling (PS) sub-clauses are composed of:
— PS entity requirements;
— PS device interface requirements; and
— PS network system requirements.
The physical medium attachment (PMA) sub-clauses are composed of:
— PMA protocol entity requirements; and
— PMA device interface requirements.
The physical medium dependent (PMD) sub-clauses are composed of:
— PMD entity requirements;
— PMD device interface requirements; and
— PMD network system requirements.
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 4141-1, Road vehicles — Multi-core connecting cables — Part 1: Test methods and requirements for
basic performance sheathed cables
ISO 11898-1, Road vehicles — Controller area network (CAN) — Part 1: Data link layer and physical
signalling
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
3.1
1-wire operation
communication on either CAN_L or CAN_H with reference to ground and V potential during fault-
s
tolerant operation mode
3.2
2-wire operation
communication on CAN_L and CAN_H, with reference to ground and V potential, in nominal (non fault-
s
tolerant) operation mode
3.3
bus
communication link between two communication entities
3.4
CAN_H
CAN_L
particular cable and/or contact of the communication connection
3.5
differential transmission
transmission of digital information carried by voltage between the two conductors of the electrical
connections
3.6
maximum authorised total mass
vehicle mass determined as a maximum by the administrative authority for operating conditions laid
down by that authority
Note 1 to entry: In some jurisdictions this will be known as the Gross Vehicle Weight Rating or the Gross
Combination Weight Rating.
[SOURCE: ISO 1176:1990, 4.8, modified — NOTES 1 and 2 replaced by a new Note 1 to entry]
3.7
data link layer protocol entity
DLL protocol entity
functional part of the electronic component implementing the DLL protocol as standardised in
ISO 11898-1
...
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