ISO 16844-6:2022

INTERNATIONAL ISO
STANDARD 16844-6
Third edition
2022-05
Road vehicles — Tachograph
systems —
Part 6:
Diagnostic communication interfaces
Véhicules routiers — Systèmes tachygraphes —
Partie 6: Interfaces de communication de diagnostic
Reference number
© ISO 2022
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ii
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 2
5 Overview and conventions .2
5.1 General . 2
5.2 Service description conventions . . 3
5.3 Addresses . 3
5.3.1 Functional addresses . . . 3
5.3.2 Physical addresses . 3
5.4 Parameters . 3
6 Diagnostic services implementation .3
6.1 General and overview . 3
6.2 Diagnostic and communication management functional unit . 5
6.2.1 DiagnosticSessionControl service . 5
6.2.2 ECUReset service . 5
6.2.3 SecurityAccess service . 5
6.2.4 CommunicationControl service . 5
6.2.5 ResponseOnEvent service . 6
6.2.6 LinkControl service . 6
6.3 Data transmission functional unit . 7
6.3.1 ReadDataByIdentifier service . 7
6.3.2 ReadDataByPeriodicIdentifier service . 7
6.3.3 DynamicallyDefineDataIdentifier service . 7
6.3.4 WriteDataByIdentifier service . 8
6.4 Stored data transmission functional unit . 8
6.4.1 ClearDiagnosticInformation service. 8
6.4.2 ReadDTCInformation service . 8
6.5 Input/Output control functional unit . 9
6.5.1 InputOutputControlByIdentifier service . 9
6.6 Remote activation of routine functional unit . 9
6.6.1 RoutineControl service . 9
7 Application layer requirements .10
7.1 General . 10
7.2 Application layer protocol . 10
7.2.1 General . 10
7.2.2 Application layer timing . 10
8 Presentation layer requirements .10
9 Session layer requirements . .11
10 CAN-based communication interface .11
10.1 General . 11
10.2 Application layer . 11
10.3 Transport layer . . 11
10.4 Network layer . 11
10.5 Data link layer . 11
10.6 Physical layer . 11
11 K-Line based communication interface .11
11.1 General . 11
iii
11.2 Data link layer . 11
11.3 Physical layer .12
Bibliography .13
iv
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 16844-6:2015), which has been
technically revised.
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.
v
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 4 CAN-based data IF including parameter groups
ISO 16844-1 standardized in ISO 16844-4
2 electrical data and service IF requirements 5 optional CAN-based service IF standardized in
standardized in ISO 16844-2 ISO 16884-6
3 communication interface between motion sensor 6 data identifier (DID) specification for the optional
and RE standardized in ISO 16844-3 service IF standardized in ISO 16844-7
Figure 1 — Typical ISO 16844 conformant tachograph system
vi
INTERNATIONAL STANDARD ISO 16844-6:2022(E)
Road vehicles — Tachograph systems —
Part 6:
Diagnostic communication interfaces
1 Scope
This document specifies the CAN-based and the K-Line communication between the recording
equipment and service tools for software download and calibrating purposes. The provided
requirements and recommendations cover physical, data link, network, session, and application layers
according to the OSI reference model as well as the unified diagnostics services.
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 14229-1, Road vehicles — Unified diagnostic services (UDS) — Part 1: Application layer
ISO 14229-2, Road vehicles — Unified diagnostic services (UDS) — Part 2: Session layer services
ISO 14229-3, Road vehicles — Unified diagnostic services (UDS) — Part 3: Unified diagnostic services on
CAN implementation (UDSonCAN)
ISO 14229-6, Road vehicles — Unified diagnostic services (UDS) — Part 6: Unified diagnostic services on
K-Line implementation (UDSonK-Line)
ISO 14230-1, Road vehicles — Diagnostic communication over K-Line (DoK-Line) — Part 1: Physical layer
ISO 14230-2, Road vehicles — Diagnostic communication over K-Line (DoK-Line) — Part 2: Data link layer
ISO 15765-2, Road vehicles — Diagnostic communication over Controller Area Network (DoCAN) — Part 2:
Transport protocol and network layer services
ISO 16844-1, Road vehicles — Tachograph systems — Part 1: Recording equipment data and service
connector
ISO 16844-4, Road vehicles — Tachograph systems — Part 4: Display unit communication interface
ISO 16844-7, Road vehicles — Tachograph systems — Part 7: Data identifier for the CAN-based service
interface
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 16844-1 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 Abbreviated terms
For the purposes of this document, the following the following abbreviated terms apply.
C conditional
Cvt. convention
DID data identifier
DS default session
DSRC dedicated short range communication
ECU electronic control unit
EXTDS extended diagnostic session
M mandatory
N not allowed
O optional
RS remote session
SID service identifier
SSS system supplier specific session
VMS vehicle manufa
...