ISO 16844-2:2004

Road vehicles — Tachograph systems — Part 2: Recording unit, electrical interface

ISO 16844-2:2004 specifies the electrical connection between the recording unit, and the vehicle network and motion sensor, in tachograph systems used in road vehicles.

Véhicules routiers — Systèmes tachygraphes — Partie 2: Unité d'enregistrement, interface électrique

General Information

• Status: Withdrawn
• Publication Date: 16-May-2004
• Withdrawal Date: 16-May-2004
• ICS: 43.040.10 - Electrical and electronic equipment
• Technical Committee: ISO/TC 22 - Road vehicles
• Drafting Committee: ISO/TC 22 - Road vehicles
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 01-Mar-2011

Relations

• Revised: ISO 16844-2:2011 - Road vehicles — Tachograph systems — Part 2: Electrical interface with recording unit
• Effective Date: 14-Aug-2008

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 16844-2
First edition
2004-05-15

Road vehicles — Tachograph systems —
Part 2:
Recording unit, electrical interface
Véhicules routiers — Systèmes tachygraphes —
Partie 2: Unité d'enregistrement, interface électrique




Reference number
ISO 16844-2:2004(E)
©
ISO 2004

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ISO 16844-2:2004(E)
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ii © ISO 2004 – All rights reserved

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ISO 16844-2:2004(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 16844-2 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

© ISO 2004 – All rights reserved iii

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ISO 16844-2:2004(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]
amendment Council Regulation (EEC) No. 2135/98 .
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 3 speed signal, real time
2 battery minus 4 data signal in/out
Figure 1 — Typical tachograph system
iv © ISO 2004 – All rights reserved

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INTERNATIONAL STANDARD ISO 16844-2:2004(E)

Road vehicles — Tachograph systems —
Part 2:
Recording unit, electrical interface
1 Scope
This part of ISO 16844 specifies the electrical connection between the recording unit, and the vehicle network
and motion sensor, in tachograph systems used in road vehicles.
2 Normative references
The following referenced documents are indispensable for the application 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 16844-1, Road Vehicles — Tachograph Systems — Part 1: Electrical connectors
1)
ISO 16844-3, Road Vehicles — Tachograph Systems — Part 3: Motion sensor interface
1)
ISO 16844-4, Road Vehicles — Tachograph Systems — Part 4: CAN interface
3 Requirements
3.1 Connector
The connector used for the recording unit shall be in accordance with ISO 16844-1.
3.2 Electrical connection
3.2.1 Standard connector — Module A
The electrical requirements of mod
...