Alarm systems - Part 7-3: Message formats and protocols for serial data interfaces in alarm transmission systems - Common data link layer protocol

Specifies the data link layer message structure, formats and transmission procedures which should be used at standard serial data interfaces in alarm transmission systems where the transmission network employed does not offer a standard protocol. Is necessary in order to ensure compatibility of equipment from different suppliers.

Systèmes d'alarme - Partie 7-3: Formats de message et protocoles pour les interfaces de données série dans les systèmes de transmission d'alarme - Protocole de la couche commune de liaison de données

Spécifie la structure de message, les formats et les procédures de transmission de la couche liaison de données qu'il convient d'utiliser au niveau des interfaces de données série normalisées dans les systèmes de transmission d'alarme lorsque le réseau de transmission utilisé n'offre pas de protocole normalisé. Est destiné à assurer la compatibilité entre matériels provenant de fournisseurs différents.

General Information

Status
Withdrawn
Publication Date
08-Mar-2001
Withdrawal Date
13-Oct-2022
Drafting Committee
WG 5 - TC 79/WG 5
Current Stage
WPUB - Publication withdrawn
Start Date
14-Oct-2022
Completion Date
14-Oct-2022

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IEC 60839-7-3:2001 - Alarm systems - Part 7-3: Message formats and protocols for serial data interfaces in alarm transmission systems - Common data link layer protocol

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Frequently Asked Questions

IEC 60839-7-3:2001 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Alarm systems - Part 7-3: Message formats and protocols for serial data interfaces in alarm transmission systems - Common data link layer protocol". This standard covers: Specifies the data link layer message structure, formats and transmission procedures which should be used at standard serial data interfaces in alarm transmission systems where the transmission network employed does not offer a standard protocol. Is necessary in order to ensure compatibility of equipment from different suppliers.

Specifies the data link layer message structure, formats and transmission procedures which should be used at standard serial data interfaces in alarm transmission systems where the transmission network employed does not offer a standard protocol. Is necessary in order to ensure compatibility of equipment from different suppliers.

IEC 60839-7-3:2001 is classified under the following ICS (International Classification for Standards) categories: 13.320 - Alarm and warning systems. The ICS classification helps identify the subject area and facilitates finding related standards.

IEC 60839-7-3:2001 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

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INTERNATIONAL IEC
STANDARD
60839-7-3
First edition
2001-03
Alarm systems –
Part 7-3:
Message formats and protocols for serial data
interfaces in alarm transmission systems –
Common data link layer protocol
Systèmes d'alarme –
Partie 7-3:
Formats de message et protocoles pour les interfaces de
données série dans les systèmes de transmission d'alarme –
Protocole de la couche commune de liaison de données

Reference number
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.

Consolidated editions
The IEC is now publishing consolidated versions of its publications. For example,

edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the
base publication incorporating amendment 1 and the base publication incorporating
amendments 1 and 2.
Further information on IEC publications
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology. Information relating to
this publication, including its validity, is available in the IEC Catalogue of
publications (see below) in addition to new editions, amendments and corrigenda.
Information on the subjects under consideration and work in progress undertaken
by the technical committee which has prepared this publication, as well as the list
of publications issued, is also available from the following:
• IEC Web Site (www.iec.ch)
• Catalogue of IEC publications
The on-line catalogue on the IEC web site (www.iec.ch/catlg-e.htm) enables
you to search by a variety of criteria including text searches, technical
committees and date of publication. On-line information is also available on
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please contact the Customer Service Centre:
Email: custserv@iec.ch
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Fax: +41 22 919 03 00
INTERNATIONAL IEC
STANDARD
60839-7-3
First edition
2001-03
Alarm systems –
Part 7-3:
Message formats and protocols for serial data
interfaces in alarm transmission systems –
Common data link layer protocol
Systèmes d'alarme –
Partie 7-3:
Formats de message et protocoles pour les interfaces de
données série dans les systèmes de transmission d'alarme –
Protocole de la couche commune de liaison de données

 IEC 2001  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
Commission Electrotechnique Internationale
PRICE CODE
N
International Electrotechnical Commission
For price, see current catalogue

– 2 – 60839-7-3 © IEC:2001(E)
CONTENTS
Page
FOREWORD . 3

Clause
1 Scope . 5

2 Normative references . 5

3 Definitions. 5
4 Abbreviations . 5
5 General. 6
6 Data link data block. 6
7 Basic transmission protocol. 7
7.1 Message time-out. 7
7.2 Restart time-out . 7
7.3 Network addresses . 7
7.4 MASTER initialization. 7
7.5 SLAVE initialization . 8
7.6 Data link layer authentication (DLLA) function. 8
7.7 Normal state . 9
7.8 Multipoint operation. 9
7.9 Wait state . 10
7.10 Message From MASTER . 10
7.11 SLAVE to SLAVE communications . 10
7.12 General protocol . 11
7.12.1 Reception errors. 11
7.12.2 Response. 11
7.12.3 Failure to respond . 11
7.12.4 Re-initialization of SLAVEs . 11
7.12.5 Failure of the MASTER. 11
Annex A (normative)  Data link data block types. 12

60839-7-3 © IEC:2001(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION

––––––––
ALARM SYSTEMS –
Part 7-3: Message formats and protocols for serial data interfaces

in alarm transmission systems –

Common data link layer protocol

FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization
for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60839-7-3 has been prepared by IEC technical committee 79: Alarm
systems.
The text of this standard is based on the following documents:
FDIS Report on voting
79/200/FDIS 79/210/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
Annex A forms an integral part of this standard.
The committee has decided that the contents of this publication will remain unchanged until
2004. At this date, the publication will be
reconfirmed;
withdrawn;
replaced by a revised edition, or
amended.
– 4 – 60839-7-3 © IEC:2001(E)
A bilingual version of this standard may be issued at a later date.

IEC 60839-7-3 forms one of a number of related parts presented under the general title: Alarm

systems – Part 7: Message formats and protocols for serial data interfaces in alarm

transmission systems:
IEC 60839-7-1: General
IEC 60839-7-2: Common application layer protocol

IEC 60839-7-3: Common data link layer protocol

IEC 60839-7-4: Common transport layer protocol

IEC 60839-7-5: Alarm system interfaces employing a two-wire configuration in accordance
with ISO/IEC 8482
IEC 60839-7-6: Alarm system interfaces employing ITU-T Recommendation V.24/V.28
signals
IEC 60839-7-7: Alarm system interfaces for plug-in alarm system transceivers
IEC 60839-7-11: Serial protocol for use by digital communicator systems using ITU-T
Recommendation V.23 signalling at interfaces with the PSTN
IEC 60839-7-12: PTT interfaces for dedicated communications using ITU-T
Recommendation V.23 signalling
IEC 60839-7-20: Terminal interfaces employing ITU-T Recommendation V.24/V.28
signalling
60839-7-3 © IEC:2001(E) – 5 –
ALARM SYSTEMS –
Part 7-3: Message formats and protocols for serial data interfaces

in alarm transmission systems –

Common data link layer protocol

1 Scope
This part of IEC 60839 specifies the data link layer message structure, formats and
transmission procedures which should be used at standard serial data interfaces in alarm
transmission systems where the transmission network employed does not offer a standard
protocol. This is necessary in order to ensure compatibility of equipment from different
suppliers.
The standard applies equally to the transmission of alarms and other messages to/from
intrusion, fire, access control and social alarm systems, and to the transmission of information
to/from other similar systems.
The protocol is based on a simple poll response algorithm, with a single MASTER and one or
more SLAVEs. The protocol defined allows for point-point and point-multipoint operation.
Multipoint to multipoint operation is not supported, however the structure does support the
transmission of messages from one SLAVE to another, using the MASTER as a simple router.
The structure follows the OSI recommendations for a layered protocol to allow flexibility in the
use of the physical layer.
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this part of IEC 60839. For dated references, subsequent amendments
to, or revisions of, any of these publications do not apply. However, parties to agreements
based on this part of IEC 60839 are encouraged to investigate the possibility of applying the
most recent editions of the normative documents indicated below. For undated references, the
latest edition of the normative document referred to applies. Members of IEC and ISO maintain
registers of currently valid International Standards.
IEC 60839-5-1, Alarm systems – Part 5: Requirements for alarm transmission systems –

Section 1: General requirements for systems
IEC 60839-7-1, Alarm systems – Part 7-1: Message formats and protocols for serial data inter-
faces in alarm transmission systems – General
3 Definitions
For the purpose of this part of IEC 60839, the definitions in IEC 60839-7-1 apply.
4 Abbreviations
The abbreviations in IEC 60839-7-1 apply.

– 6 – 60839-7-3 © IEC:2001(E)
5 General
The basic protocol employed is a poll-response, with a single MASTER. Where there is more

than a single SLAVE, the MASTER will normally poll each slave in turn.

Messages requiring transmission shall be formatted into one or more data link data blocks,

which shall be transmitted in order to the intended destination.

Each transmitted data link data block shall be explicitly acknowledged before the transmission

of a subsequent block.
6 Data link data block
The data link shall transmit messages with the following structure:
STX
LENGTH
SLAVE ADDRESS
KS R
(5 bits)
X/Y
DATA LINK DATA BLOCK TYPE
DATA LINK DATA
max. 248 octets
CRC
The STX octet shall be 02 HEX.
The message LENGTH shall be the number of octets following the LENGTH octet up to (and
including) the CRC.
The bit K (bit 7 of 3rd octet) shall be set (=1) to specify a message in which the data link layer
authentication (DLLA) function is active, and unset (=0) where it is not.

The bit R (bit 5 of 3rd octet) is reserved and should be unset (=0).
The bit S (bit 6 of 3rd octet) is a sequence bit, and shall initially be unset (=0). The bit shall be
set (=1) in the INIT DLLA data link data block type and shall be toggled for each new message
transmitted by the MASTER. A SLAVE shall always set the S bit equal to the corresponding bit
in the incoming message.
The X/Y octet is set to X for messages transmitted from the MASTER, and to Y for messages
transmitted from a SLAVE.
The CRC shall be a 2-octet cyclic redundancy check computed using the polynomial generator
16 12 5
X +X +X +1.
60839-7-3 © IEC:2001(E) – 7 –
NOTE This standard mostly refers to the communications between a MASTER and a single SLAVE. In practice,

the MASTER will communicate with several SLAVEs, interspersing their messages on the common transmission
medium. The values of X, Y and S are particular to an individual SLAVE and are not affected by intervening
communications with other SLAVEs. For example, if the value of S used to poll one SLAVE is 1 then, irrespective of

the number of other SLAVEs polled after that, the next poll to the original SLAVE will use S=0 (assuming the

original poll was successful).

7 Basic transmission protocol
Unless otherwise stated the protocol between the MASTER and each SLAVE is independent of

the communication with other SLAVEs.

The following applies to the communication with an individual SLAVE. Intervening
communications with other SLAVEs is not shown.
Details of data link data block types are given in annex A.
7.1 Message time-out
Message time-out is defined as the maximum allowable time between the end of a message
...


IEC 60839-7-3
Edition 1.0 2001-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Alarm systems –
Part 7-3: Message formats and protocols for serial data interfaces in alarm
transmission systems – Common data link layer protocol

Systèmes d’alarme –
Partie 7-3: Formats de message et protocoles pour les interfaces de données
série dans les systèmes de transmission d’alarme – Protocole de la couche
commune de liaison de données
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by
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IEC 60839-7-3
Edition 1.0 2001-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Alarm systems –
Part 7-3: Message formats and protocols for serial data interfaces in alarm
transmission systems – Common data link layer protocol

Systèmes d’alarme –
Partie 7-3: Formats de message et protocoles pour les interfaces de données
série dans les systèmes de transmission d’alarme – Protocole de la couche
commune de liaison de données
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
N
CODE PRIX
ICS 13.320 ISBN 2-8318-6015-6
– 2 – 60839-7-3 © CEI:2001
SOMMAIRE
AVANT-PROPOS .4
1 Domaine d’application.8
2 Références normatives .8
3 Définitions .8
4 Abréviations.8
5 Généralités.10
6 Bloc de données de liaison de données.10
7 Protocole fondamental de transmission.12
7.1 Temporisation de message.12
7.2 Temporisation de redémarrage .12
7.3 Adresses réseau.12
7.4 Initialisation du maître (MASTER) .12
7.5 Initialisation d’ESCLAVE (SLAVE).14
7.6 Fonction d’identification de la couche de liaison de données (DLLA).16
7.7 Etat normal.16
7.8 Fonctionnement multipoints .16
7.9 Etat d’attente .18
7.10 Message provenant du maître (MASTER) .18
7.11 Communications ESCLAVE (SLAVE) à ESCLAVE (SLAVE).20
7.12 Protocole général .20
7.12.1 Erreurs de réception .20
7.12.2 Réponse .20
7.12.3 Défaillance de réponse .20
7.12.4 Réinitialisation des ESCLAVES (SLAVEs) .22
7.12.5 Défaillance du maître (MASTER).22
Annexe A (normative) Types de blocs de données de liaison de données .24

60839-7-3 © IEC:2001 – 3 –
CONTENTS
FOREWORD.5
1 Scope.9
2 Normative references.9
3 Definitions .9
4 Abbreviations.9
5 General .11
6 Data link data block .11
7 Basic transmission protocol .13
7.1 Message time-out .13
7.2 Restart time-out.13
7.3 Network addresses .13
7.4 MASTER initialization .13
7.5 SLAVE initialization.15
7.6 Data link layer authentication (DLLA) function .17
7.7 Normal state.17
7.8 Multipoint operation .17
7.9 Wait state.19
7.10 Message From MASTER.19
7.11 SLAVE to SLAVE communications .21
7.12 General protocol.21
7.12.1 Reception errors .21
7.12.2 Response .21
7.12.3 Failure to respond.21
7.12.4 Re-initialization of SLAVEs.23
7.12.5 Failure of the MASTER .23
Annex A (normative)  Data link data block types .25

– 4 – 60839-7-3 © CEI:2001
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
SYSTÈMES D'ALARME –
Partie 7-3: Formats de message et protocoles pour les interfaces
de données série dans les systèmes de transmission d'alarme –
Protocole de la couche commune de liaison de données

AVANT-PROPOS
1) La CEI (Commission Electrotechnique Internationale) est une organisation mondiale de normalisation composée
de l'ensemble des comités électrotechniques nationaux (Comités nationaux de la CEI). La CEI a pour objet de
favoriser la coopération internationale pour toutes les questions de normalisation dans les domaines de
l'électricité et de l'électronique. A cet effet, la CEI, entre autres activités, publie des Normes internationales.
Leur élaboration est confiée à des comités d'études, aux travaux desquels tout Comité national intéressé par le
sujet traité peut participer. Les organisations internationales, gouvernementales et non gouvernementales, en
liaison avec la CEI, participent également aux travaux. La CEI collabore étroitement avec l'Organisation
Internationale de Normalisation (ISO), selon des conditions fixées par accord entre les deux organisations.
2) Les décisions ou accords officiels de la CEI concernant les questions techniques représentent, dans la mesure
du possible un accord international sur les sujets étudiés, étant donné que les Comités nationaux intéressés
sont représentés dans chaque comité d’études.
3) Les documents produits se présentent sous la forme de recommandations internationales. Ils sont publiés
comme normes, rapports techniques ou guides et agréés comme tels par les Comités nationaux.
4) Dans le but d'encourager l'unification internationale, les Comités nationaux de la CEI s'engagent à appliquer de
façon transparente, dans toute la mesure possible, les Normes internationales de la CEI dans leurs normes
nationales et régionales. Toute divergence entre la norme de la CEI et la norme nationale ou régionale
correspondante doit être indiquée en termes clairs dans cette dernière.
5) La CEI n’a fixé aucune procédure concernant le marquage comme indication d’approbation et sa responsabilité
n’est pas engagée quand un matériel est déclaré conforme à l’une de ses normes.
6) L’attention est attirée sur le fait que certains des éléments de la présente Norme internationale peuvent faire
l’objet de droits de propriété intellectuelle ou de droits analogues. La CEI ne saurait être tenue pour
responsable de ne pas avoir identifié de tels droits de propriété et de ne pas avoir signalé leur existence.
La Norme internationale CEI 60839-7-3 a été établie par le comité d'études 79 de la CEI:
Systèmes d’alarme.
La présente version bilingue, publiée en 2001-11, correspond à la version anglaise.
Le texte anglais de cette norme est basé sur les documents 79/200/FDIS et 79/210/RVD. Le
rapport de vote 79/210/RVD donne toute information sur le vote ayant abouti à l'approbation de
cette norme.
La version française de cette norme n'a pas été soumise au vote.
Cette publication a été rédigée selon les Directives ISO/CEI, Partie 3.
L'annexe A fait partie intégrante de cette norme.
Le comité a décidé que le contenu de cette publication ne sera pas modifié avant 2004. A cette
date, la publication sera
• reconduite;
• supprimée;
• remplacée par une édition révisée, ou
• amendée.
60839-7-3 © IEC:2001 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ALARM SYSTEMS –
Part 7-3: Message formats and protocols for serial data interfaces
in alarm transmission systems –
Common data link layer protocol

FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization
for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60839-7-3 has been prepared by IEC technical committee 79: Alarm
systems.
This bilingual version, published in 2001-11, corresponds to the English version.
The text of this standard is based on the following documents:
FDIS Report on voting
79/200/FDIS 79/210/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
Annex A forms an integral part of this standard.
The committee has decided that the contents of this publication will remain unchanged
until 2004. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
– 6 – 60839-7-3 © CEI:2001
La CEI 60839-7-3 constitue une partie d'une série de publications présentées sous le titre
général: Systèmes d'alarme – Partie 7: Formats de message et protocoles pour les interfaces
de données série dans les systèmes de transmission d'alarme.
CEI 60839-7-1: Généralités
CEI 60839-7-2: Protocole de la couche commune d'application
CEI 60839-7-3: Protocole de la couche commune de liaison de données
CEI 60839-7-4: Protocole de la couche commune de transport
CEI 60839-7-5: Interfaces des systèmes d'alarme utilisant une configuration bifilaire
conforme à l'ISO/CEI 8482
CEI 60839-7-6: Interfaces des systèmes d'alarme utilisant la recommandation UIT-T
V.24/V.28 pour la signalisation
CEI 60839-7-7: Interfaces des systèmes d'alarme pour les transmetteurs de systèmes
d'alarme enfichables
CEI 60839-7-11: Protocole série à utiliser par les systèmes numériques de communication
utilisant la recommandation UIT-T V.23 pour la signalisation au niveau des
interfaces avec le RTPC
CEI 60839-7-12: Interfaces PTT pour les voies de communication dédiées utilisant la
recommandation UIT-T V.23 pour la signalisation
CEI 60839-7-20: Interfaces d'extrémité utilisant la recommandation UIT-T V.24/V.28 pour la
signalisation
60839-7-3 © IEC:2001 – 7 –
IEC 60839-7-3 forms one of series of publications presented under the general title: Alarm
systems – Part 7: Message formats and protocols for serial data interfaces in alarm
transmission systems.
IEC 60839-7-1: General
IEC 60839-7-2: Common application layer protocol
IEC 60839-7-3: Common data link layer protocol
IEC 60839-7-4: Common transport layer protocol
IEC 60839-7-5: Alarm system interfaces employing a two-wire configuration in accordance
with ISO/IEC 8482
IEC 60839-7-6: Alarm system interfaces employing ITU-T Recommendation V.24/V.28
signals
IEC 60839-7-7: Alarm system interfaces for plug-in alarm system transceivers
IEC 60839-7-11: Serial protocol for use by digital communicator systems using ITU-T
Recommendation V.23 signalling at interfaces with the PSTN
IEC 60839-7-12: PTT interfaces for dedicated communications using ITU-T Recommendation
V.23 signalling
IEC 60839-7-20: Terminal interfaces employing ITU-T Recommendation V.24/V.28 signalling

– 8 – 60839-7-3 © CEI:2001
SYSTÈMES D'ALARME –
Partie 7-3: Formats de message et protocoles pour les interfaces
de données série dans les systèmes de transmission d'alarme –
Protocole de la couche commune de liaison de données
1 Domaine d’application
La présente partie de la CEI 60839 spécifie la structure de message, les formats et les
procédures de transmission de la couche liaison de données qu’il convient d’utiliser au niveau
des interfaces de données série normalisées dans les systèmes de transmission d’alarme
lorsque le réseau de transmission utilisé n’offre pas de protocole normalisé. Ceci est
nécessaire pour assurer la compatibilité entre matériels provenant de fournisseurs différents.
Cette norme s'applique également à la transmission d'alarmes et d'autres messages destinés
ou provenant de systèmes d’alarme intrusion, incendie, de contrôle d’accès et d’alarme
sociale, ainsi qu'à la transmission d'informations destinées ou provenant d'autres systèmes
similaires.
Ce protocole est basé sur un algorithme de réponse de consultation simple, avec un seul
MAÎTRE (MASTER) et un ou plusieurs ESCLAVES (SLAVEs). Le protocole défini permet un
fonctionnement point à point et point-multipoints. Le fonctionnement multipoints à multipoints
n’est pas supporté, cependant la structure ne supporte pas la transmission des messages
provenant d’un ESCLAVE (SLAVE) et destinés à un autre en utilisant le MAÎTRE (MASTER)
comme un simple routeur.
La structure suit les recommandations de l’OSI pour le protocole en couches destiné à
permettre de la souplesse d’utilisation de la couche physique.
2 Références normatives
Les documents de référence suivants sont indispensables pour l'application du présent
document. Pour les références datées, seule l'édition citée s'applique. Pour les références non
datées, la dernière édition du document de référence s'applique (y compris les éventuels
amendements).
CEI 60839-5-1, Systèmes d'alarme – Partie 5-1: Prescriptions pour les systèmes de
transmission d’alarme – Prescriptions générales pour les systèmes
CEI 60839-7-1, Systèmes d'alarme – Partie 7-1: Formats de message et protocoles pour les
interfaces de données série dans les systèmes de transmission d'alarme – Généralités
3 Définitions
Pour les besoins de cette partie de la CEI 60839, les définitions de la CEI 60839-7-1
s’appliquent.
4 Abréviations
Les abréviations de la CEI 60839-7-1 s’appliquent.

60839-7-3 © IEC:2001 – 9 –
ALARM SYSTEMS –
Part 7-3: Message formats and protocols for serial data interfaces
in alarm transmission systems –
Common data link layer protocol
1 Scope
This part of IEC 60839 specifies the data link layer message structure, formats and
transmission procedures which should be used at standard serial data interfaces in alarm
transmission systems where the transmission network employed does not offer a standard
protocol. This is necessary in order to ensure compatibility of equipment from different
suppliers.
The standard applies equally to the transmission of alarms and other messages to/from
intrusion, fire, access control and social alarm systems, and to the transmission of information
to/from other similar systems.
The protocol is based on a simple poll response algorithm, with a single MASTER and one or
more SLAVEs. The protocol defined allows for point-point and point-multipoint operation.
Multipoint to multipoint operation is not supported, however the structure does support the
transmission of messages from one SLAVE to another, using the MASTER as a simple router.
The structure follows the OSI recommendations for a layered protocol to allow flexibility in the
use of the physical layer.
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.
IEC 60839-5-1, Alarm systems – Part 5-1: Requirements for alarm transmission systems –
General requirements for systems
IEC 60839-7-1, Alarm systems – Part 7-1: Message formats and protocols for serial data inter-
faces in alarm transmission systems – General
3 Definitions
For the purpose of this part of IEC 60839, the definitions in IEC 60839-7-1 apply.
4 Abbreviations
The abbreviations in IEC 60839-7-1 apply.

– 10 – 60839-7-3 © CEI:2001
5 Généralités
Le protocole de base employé est une réponse à une consultation, avec un seul maître
(MASTER). Lorsqu’il y a plus d’un seul ESCLAVE (SLAVE), le MAÎTRE (MASTER) va
normalement consulter successivement chaque esclave.
Les messages à transmettre doivent être formatés en un ou plusieurs blocs de données de
liaison de données, qui doivent être transmis dans l’ordre à la destination prévue.
Chaque bloc de données de liaison de données transmis doit être acquitté de manière explicite
avant la transmission d’un autre bloc.
6 Bloc de données de liaison de données
La liaison de données doit transmettre les messages avec la structure suivante:
STX
LONGUEUR
ADRESSE ESCLAVE
KS R
(SLAVE ADDRESS)
(5 bits)
X/Y
TYPE DE BLOC DE DONNÉES DE LIAISON
DE DONNÉES
DONNÉES DE LIAISON DE DONNÉES
maximum 248 octets
CRC
L’octet STX doit être égal à 02 HEX.
La longueur (LENGTH) du message doit correspondre au nombre d’octets placés après l’octet
de longueur (LENGTH) jusqu’au CRC (compris).
ème
Le bit K (bit 7 du 3 octet) doit être activé (=1) pour spécifier un message dans lequel la
fonction d’authentification de la couche de liaison de données (DLLA) est active et doit être
désactivé (=0) lorsque cette fonction n’est pas active.
ème
Le bit R (bit 5 du 3 octet) est réservé et il convient qu’il ne soit pas activé (=0).
ème
Le bit S (bit 6 du 3 octet) est un bit de séquence et, au départ, il ne doit pas être activé (=0).
Ce bit doit être activé (=1) dans le type de bloc de données de liaison de données INIT DLLA
et il doit être modifié pour chaque nouveau message transmis par le MAÎTRE (MASTER).
Un ESCLAVE (SLAVE) doit toujours activer le bit S qui est égal au bit correspondant dans le
message entrant.
L’octet X/Y est forcé à X pour les messages transmis par le MAÎTRE (MASTER) et à Y pour les
messages transmis par un ESCLAVE (SLAVE).

60839-7-3 © IEC:2001 – 11 –
5 General
The basic protocol employed is a poll-response, with a single MASTER. Where there is more
than a single SLAVE, the MASTER will normally poll each slave in turn.
Messages requiring transmission shall be formatted into one or more data link data blocks,
which shall be transmitted in order to the intended destination.
Each transmitted data link data block shall be explicitly acknowledged before the transmission
of a subsequent block.
6 Data link data block
The data link shall transmit messages with the following structure:
STX
LENGTH
SLAVE ADDRESS
KS R
(5 bits)
X/Y
DATA LINK DATA BLOCK TYPE
DATA LINK DATA
max. 248 octets
CRC
The STX octet shall be 02 HEX.
The message LENGTH shall be the number of octets following the LENGTH octet up to (and
including) the CRC.
The bit K (bit 7 of 3rd octet) shall be set (=1) to specify a message in which the data link layer
authentication (DLLA) function is active, and unset (=0) where it is not.
The bit R (bit 5 of 3rd octet) is reserved and should be unset (=0).
The bit S (bit 6 of 3rd octet) is a sequence bit, and shall initially be unset (=0). The bit shall be
set (=1) in the INIT DLLA data link data block type and shall be toggled for each new message
transmitted by the MASTER. A SLAVE shall always set the S bit equal to the corresponding bit
in the incoming message.
The X/Y octet is set to X for messages transmitted from the MASTER, and to Y for messages
transmitted from a SLAVE.
– 12 – 60839-7-3 © CEI:2001
Le code CRC doit être un code cyclique de redondance à 2 octets calculé en utilisant le
16 12 5
générateur de polynômes X +X +X +1.
NOTE  Cette norme se réfère essentiellement aux communications entre un MAÎTRE (MASTER) et un seul
ESCLAVE (SLAVE). En pratique, le MAÎTRE (MASTER) communiquera avec plusieurs ESCLAVES (SLAVEs),
entremêlant leurs messages sur le support de transmission commun. Les valeurs de X, Y et S sont particulières à
un ESCLAVE (SLAVE) et ne sont pas affectées par l’intervention des communications avec d’autres ESCLAVES
(SLAVEs). Par exemple, si la valeur de
...

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