ISO 16844-3:2022
(Main)Road vehicles — Tachograph systems — Part 3: Motion sensor communication interface
Road vehicles — Tachograph systems — Part 3: Motion sensor communication interface
This document specifies the communication interface between motion sensor and recording equipment. This includes the mechanical, electrical and logical requirements.
Véhicules routiers — Systèmes tachygraphes — Partie 3: Interface de communication pour capteur de mouvement
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 16844-3
Second edition
2022-05
Road vehicles — Tachograph
systems —
Part 3:
Motion sensor communication
interface
Véhicules routiers — Systèmes tachygraphes —
Partie 3: Interface de communication pour capteur de mouvement
Reference number
© ISO 2022
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Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms.2
5 Connector . . 4
5.1 Dimensions and pin allocation . 4
5.2 Electrical specification . 4
5.2.1 Electrical requirements . 4
5.2.2 Block diagram data signal, in/out . 5
5.2.3 Voltage monitoring and watchdog signal . 6
5.2.4 Block diagram of the speed signal, real-time . 7
6 Cable . 8
7 Interface protocol . 9
7.1 Transmission . 9
7.1.1 Bit rate and frame structure . 9
7.1.2 Frame specification . 9
7.1.3 State diagram — Communication and execution of instructions . 11
7.2 Motion sensor state at the end of production .12
7.3 Instructions . 12
7.4 Initialisation of communication between motion sensor and recording equipment .13
7.4.1 General .13
7.4.2 Necessary sequence of instruction for pairing .13
7.4.3 Pairing initialisation of recording equipment and motion sensor . 14
7.4.4 Transmission of encrypted serial number of motion sensor . 14
7.4.5 Transmission of session key from recording equipment to motion sensor .15
7.4.6 Transmission of pairing information from recording equipment to motion
sensor . 15
7.4.7 Request from recording equipment for pairing information and
authentication to motion sensor . 16
7.5 Communication of motion sensor and recording equipment in regular use . 16
7.5.1 Sequence of instruction for communication in regular use. 16
7.5.2 Latch of counter value and encrypt data . 17
7.5.3 Transmission of encrypted data . 18
7.6 Read information . 19
7.6.1 Necessary sequence of instruction for reading information . 19
7.6.2 Request . 19
7.6.3 General message structures. 20
7.6.4 Data block chaining . 21
7.6.5 Structures of selected data . 21
7.6.6 Pairing data . 24
8 Optional functionality .25
8.1 Additional direction information in the MF byte . 25
Bibliography .26
iii
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 second edition cancels and replaces the first edition (ISO 16844-3:2004), which has been
technically revised. It also incorporates the Technical Corrigendum ISO 16844-3:2004/Cor. 1:2006.
The main changes are as follows:
— part 5 of this series (ISO 16844-5) has been removed due to its technical irrelevance,
— correction of the typos and mistakes in the text,
— adoption of the content according to the new version of the ISO guidelines,
— adoption of the content according to the new technical requirements,
— alignment of the content regarding to the referred standards.
A list of all parts in the ISO 16844 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
Introduction
This document supports and facilitates the communication between electronic control units (ECUs)
and a digital tachograph.
The digital tachograph concept is based upon a recording equipment storing data, related to the
activities of the various drivers driving the vehicle, on which it is installed.
During the normal operational status of the recording equipment, data stored in its memory are
accessible to different entities (drivers, authorities, workshops, transport companies) in different ways
(displayed on a screen, printed by a printing device, downloaded to an external device). Access to stored
data is controlled by a smart card inserted in the tachograph.
A typical tachograph system is shown in Figure 1.
Key
1 data and service IF connector standardized in ISO 4 CAN-based data IF including parameter groups
16844-1 standardized in ISO 16844-4
2 electrical data and service IF requirements 5 optional CAN-based service IF standardized in ISO
standardized in ISO 16844-2 16884-6
3 communication interface between motion sensor 6 data identifier (DID) specification for the optional
and RE standardized in this document service IF standardized in ISO 16844-7
Figure 1 — Typical ISO 16844 conformant tachograph system
v
INTERNATIONAL STANDARD ISO 16844-3:2022(E)
Road vehicles — Tachograph systems —
Part 3:
Motion sensor communication interface
1 Scope
This document specifies the communication interface between motion sensor and recording equipment.
This includes the mechanical, electrical and logical 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 15170-1, Road vehicles — Four-pole electrical connectors with pins and twist lock — Part 1: Dimensions
and classes of application
ISO 16844-1, Road vehicles — Tachograph systems — Part 1: Recording equipment data and service
connector
ISO/IEC 8859-1, Information technology — 8-bit single-byte coded graphic character sets — Part 1: Latin
alphabet No. 1
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 16844-1 and the following
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/
3.1
check sum
sum (two byte value) of the bytes pointed out at the corresponding location
3.2
direction of movement
bit 6 of byte MF indicating whether the vehicle moving direction is forward or reverse
3.3
direction of movement On
bit 7 of byte MF indicating whether the additional direction information is available or not
3.4
identification key
key necessary for initialisation of a motion sensor, not store
...
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