ISO 16844-5:2004

Road vehicles — Tachograph systems — Part 5: Secured CAN interface

ISO 16844-5:2004 specifies the secured interchange of digital information between a road vehicle's tachograph system and vehicle units, and within the tachograph system itself. This type of interchange will be used for CAN communication or diagnostic services on CAN (controller area network), where there is need to protect interchanged parameters against fraud.

Véhicules routiers — Systèmes tachygraphes — Partie 5: Interface CAN sauvegardée

General Information

• Status: Withdrawn
• Publication Date: 08-Aug-2004
• Withdrawal Date: 08-Aug-2004
• ICS: 43.040.10 - Electrical and electronic equipment
• Technical Committee: ISO/TC 22/SC 31 - Data communication
• Drafting Committee: ISO/TC 22/SC 31/WG 4 - Network applications
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 26-Feb-2019

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 16844-5
First edition
2004-08-01

Road vehicles — Tachograph systems —
Part 5:
Secured CAN interface
Véhicules routiers — Systèmes tachygraphes —
Partie 5: Interface CAN sauvegardée




Reference number
ISO 16844-5:2004(E)
©
ISO 2004

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ISO 16844-5:2004(E)
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ii © ISO 2004 – All rights reserved

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ISO 16844-5:2004(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references . 1
3 Terms and definitions. 1
4 Abbreviated terms. 2
5 Physical layer . 2
6 Data link layer. 2
7 Network layer. 2
8 Application layer . 2
9 Security sub-layer . 2
Bibliography . 5

© ISO 2004 – All rights reserved iii

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ISO 16844-5:2004(E)
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 16844-5 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3,
Electrical and electronic equipment.
ISO 16844 consists of the following parts, under the general title Road vehicles — Tachograph systems:
 Part 1: Electrical connectors
 Part 2: Recording unit, electrical interface
 Part 3: Motion sensor interface
 Part 4: CAN interface
 Part 5: Secured CAN interface
 Part 6: Diagnostics
 Part 7: Parameters
iv © ISO 2004 – All rights reserved

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ISO 16844-5:2004(E)
Introduction
ISO 16844 supports and facilitates the communication between electronic units and a tachograph; the
[1] [2]
tachograph being based upon Council Regulations (EEC) No. 3820/85 and (EEC) No. 3821/85 and their
[3]
amendments Council Regulation (EEC) No. 2135/98 and Commission Regulation (EC) No. 1360/2002 (see
Clause 2).
Its purpose is to ensure the compatibility of tachographs from various tachograph manufacturers.
The basis of the digital tachograph concept is a recording unit (RU) that stores data related to the activities of
the drivers of a vehicle on which it is installed. When the RU is in normal operational status, the data stored in
its memory are made accessible to various entities such as drivers, authorities, workshops and transport
companies in a variety of ways: they may be displayed on a screen, printed by a printing device or
downloaded to an external device. Access to stored data is controlled by a smart card inserted in the
tachograph.
In order to prevent manipulation of the tachograph system, the speed signal sender (motion sensor) is
provided with an encrypted data link.
A typical tachograph system is shown in Figure 1.

Key
1 positive supply
2 battery minus
3 speed signal, real time
4 data signal in/out
Figure 1 — Typical tachograph system
© ISO 2004 – All rights reserved v

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INTERNATIONAL STANDARD ISO 16844-5:2004(E)

Road vehicles — Tachograph systems —
Part 5:
Secured CAN interface
1 Scope
This part of ISO 16844 specifies the secured interchange of digital information between a road vehicle's
tachograph system and vehicle units, and within the tachograph system i
...