Road vehicles -- Tachograph systems

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

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ISO 16844-2:2004 - Road vehicles -- Tachograph systems
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STANDARD 16844-2
First edition
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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© ISO 2004

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

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)

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

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.
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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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

ISO 16844-3, Road Vehicles — Tachograph Systems — Part 3: Motion sensor interface

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

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