SIST EN 14908-2:2006

Open Data Communication in Building Automation, Controls and Building Management - Control Network Protocol - Part 2: Twisted Pair Communication

This European Standard specifies the control network protocol (CNP) free-topology twisted-pair channel and serves as a companion European Standard to prEN14908-1. The channel supports communication at 78.125 kbps between multiple nodes, each of which consists of a transceiver, a protocol processor, an application processor, a power supply, and application electronics.
This European Standard covers the complete physical layer (OSI Layer 1), including the interface to the Media Access Control (MAC) sub-layer and the interface to the medium. Parameters that are controlled by other layers but control the operation of the physical layer are also specified.

Firmenneutrale Datenkommunikation für die Gebäudeautomation und Gebäudemanagement - Gebäudedatennetzprotokoll - Teil 2: Kommunikation über paarig verdrillte Leitungen

This document specifies the control network protocol (CNP) free-topology twisted-pair channel and serves as a companion document to CNP, part 1. The channel supports communication at 78.125 kbps between multiple nodes, each of which consists of a transceiver, a protocol processor, an application processor, a power supply, and application electronics.
This document covers the complete physical layer (OSI Layer 1), including the interface to the Media Access Control (MAC) sub-layer and the interface to the medium. Parameters that are controlled by other layers but control the operation of the physical layer are also specified.

Réseau ouvert de communication de données pour l'automatisation, la régulation et la gestion techniques du bâtiment - Protocole de réseau pour le bâtiment - Partie 2 : Communications par paires torsadées

Odprta izmenjava podatkov v avtomatizaciji stavb in izvršnih elementov ter pri upravljanju stavb – Protokol regulacijske mreže – 2. del: Komunikacija zavitega para

General Information

• Status: Withdrawn
• Publication Date: 28-Feb-2006
• Withdrawal Date: 29-May-2014
• ICS: 35.240.67 - IT applications in building and construction industry
• ICS: 97.120 - Automatic controls for household use
• Technical Committee: OGS - Heating for buildings
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 30-May-2014
• Due Date: 22-Jun-2014
• Completion Date: 30-May-2014
• Ref Project: EN 14908-2:2005 - Open Data Communication in Building Automation, Controls and Building Management - Control Network Protocol - Part 2: Twisted Pair Communication

Relations

• Replaced By: SIST EN 14908-2:2014 - Open Data Communication in Building Automation, Controls and Building Management - Control Network Protocol - Part 2: Twisted Pair Communication
• Effective Date: 01-Jul-2014
• Replaces: SIST ENV 13154-2:2005 - Data communication for HVAC application field net - Part 2: Protocols
• Effective Date: 01-Mar-2006

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 14908-2:2006
01-marec-2006
Odprta izmenjava podatkov v avtomatizaciji stavb in izvršnih elementov ter pri
upravljanju stavb – Protokol regulacijske mreže – 2. del: Komunikacija zavitega
para
Open Data Communication in Building Automation, Controls and Building Management -
Control Network Protocol - Part 2: Twisted Pair Communication
Firmenneutrale Datenkommunikation für die Gebäudeautomation und
Gebäudemanagement - Gebäudedatennetzprotokoll - Teil 2: Kommunikation über paarig
verdrillte Leitungen
Réseau ouvert de communication de données pour l'automatisation, la régulation et la
gestion techniques du bâtiment - Protocole de réseau pour le bâtiment - Partie 2 :
Communications par paires torsadées
Ta slovenski standard je istoveten z: EN 14908-2:2005
ICS:
35.240.99 8SRUDEQLãNHUHãLWYH,7QD IT applications in other fields
GUXJLKSRGURþMLK
97.120 Avtomatske krmilne naprave Automatic controls for
za dom household use
SIST EN 14908-2:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 14908-2:2006

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SIST EN 14908-2:2006
EUROPEAN STANDARD
EN 14908-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2005
ICS 97.120 Supersedes ENV 13154-2:1998
English Version
Open Data Communication in Building Automation, Controls and
Building Management - Control Network Protocol - Part 2:
Twisted Pair Communication
Réseau ouvert de communication de données pour Firmenneutrale Datenkommunikationn für die
l'automatisation, la régulation et la gestion techniques du Gebäudeautomation und Gebäudemanagement -
bâtiment - Protocole de réseau pour le bâtiment - Partie 2 : Gebäudedatennetzprotokoll - Teil 2: Kommunikation über
Communications par paires torsadées paarig verdrillte Leitungen
This European Standard was approved by CEN on 11 August 2005.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14908-2:2005: E
worldwide for CEN national Members.

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SIST EN 14908-2:2006
EN 14908-2:2005 (E)
Contents
Foreword. 3
Introduction . 4
1 Scope. 5
2 Normative References. 5
3 Network Overview. 5
4 System Specifications. 5
4.1 General Aspects. 5
4.2 Cable. 5
4.3 Topology. 6
4.3.1 Free or Bus Topology. 6
4.3.2 Repeater. 6
4.4 Cable Termination. 6
4.4.1 Free-topology Segment. 6
4.4.2 Bus Topology Segment. 6
4.5 Segment Configuration. 7
4.6 Power Specifications. 7
5 Link Power. 8
5.1 General. 8
5.2 Source. 8
5.3 Power Supply Requirements . 9
5.4 Passive Coupler Circuit . 11
6 Node Specifications. 12
6.1 Link Power. 12
6.2 Hot Plugging. 12
6.3 Transmitter/Receiver Interface to the MAC Sub-Layer . 13
6.3.1 Physical Layer Protocol Data Unit . 13
6.3.2 Frame Format. 13
6.3.3 Transmit Waveform. 14
6.4 Impedance. 17
7 Communication Parameters. 18
Annex A (informative). 19
Environmental Specifications . 19
Bibliography . 20


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SIST EN 14908-2:2006
EN 14908-2:2005 (E)
Foreword
This European Standard (EN 14908-2:2005) has been prepared by CEN /TC 247, "Building Automation,
Controls and Building Management", the secretariat of which is held by SNV.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by April 2006, and conflicting national standards shall be
withdrawn at the latest by April 2006.
This European Standard supersedes ENV 13154—2:1998.
This publication is copyright under the Berne Convention and the Universal Copyright Convention. No
part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by
means, electronic, mechanical, photocopying, recording, or otherwise, without the permission of the
European Committee for Standardization (CEN), the European Committee for Electrotechnical
Standardization (CENELEC), their National Standards Bodies and their Licensees to reproduce this
European Standard in full and including this copyright notice for the purposes of European
standardisation.
This European Standard is part of a series of standards for open data transmission in building automation,
control and in building management systems. The content of this European Standard covers the data
communications used for management, automation/control and field functions.
EN 14908-2 is part of a series of European Standards under the general title Control Network Protocol
(CNP), which comprises the following parts:
1
Part 1: Protocol Stack
1
Part 2: Twisted Pair Communication
1
Part 3: Power Line Channel Specification
1
Part 4: IP-Communication
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain,
Sweden, Switzerland and United Kingdom.

1
Under preparation.
1
Under preparation.


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SIST EN 14908-2:2006
EN 14908-2:2005 (E)
Introduction
This European Standard has been prepared to provide mechanisms through which various vendors of
building automation, control, and building management systems may exchange information in a
standardised way. It defines communication capabilities.
This European Standard is to be used by all involved in design, manufacture, engineering, installation and
commissioning activities.
This European Standard has been made in response to the essential requirements of the Constructive
Products Directive.
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SIST EN 14908-2:2006
EN 14908-2:2005 (E)
1 Scope
This European Standard specifies the control network protocol (CNP) free-topology twisted-pair channel
and serves as a companion European Standard to prEN14908-1. The channel supports communication at
78,125 kbps between multiple nodes, each of which consists of a transceiver, a protocol processor, an
application processor, a power supply, and application electronics.
This European Standard covers the complete physical layer (OSI Layer 1), including the interface to the
Media Access Control (MAC) sub-layer and the interface to the medium. Parameters that are controlled
by other layers but control the operation of the physical layer are also specified.
2 Normative References
The following referenced documents are indispensable for the application of this European Standard. For
dated references, only the edition cited applies. For undated references, the latest edition of the
referenced document (including any amendments) applies.

EN 14908-1:2005, Open Data Communication in Building Automation, Controls and Building
Management - Building Network Protocol - Part 1: Protocol Stack.
EN 50173-1, Information technology - Generic cabling systems- Part 1: General requirements and office
areas
3 Network Overview
The CNP free-topology twisted-pair channel supports up to 128 nodes on a single network segment with
an optional link power source that supplies DC power to the nodes on the network. The channel is
specified to support free-topology wiring, and will accommodate bus, star, loop, or any combination of
these topologies. The total network length and number of nodes may be extended by use of CNP channel
physical layer repeaters, or CNP compliant routers. The channel data rate is 78,125 kbps. Nodes can be
either locally powered or link powered. A link-powered node derives its power from the network. The
power is delivered on the same two conductors that carry data. Nodes are polarity-insensitive with respect
to data as well as DC power. A locally powered node derives its power from a local source. The data is
transmitted using Differential Manchester encoding, which is polarity-insensitive.
4 System Specifications
4.1 General Aspects
This section specifies the cable type used, terminations required with bus or free topology, maximum
node counts and distances for link and locally powered schemes, and the maximum steady state power
that can be drawn from the link power supply.
4.2 Cable
The cable shall conform to EN 50173-1.
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SIST EN 14908-2:2006
EN 14908-2:2005 (E)
4.3 Topology
4.3.1 Free or Bus Topology
The network may use either a singly-terminated free topology or a doubly-terminated bus topology.
4.3.2 Repeater
Two network segments may be interconnected with a channel physical layer repeater. No more than one
physical layer repeater shall be in a path between any two nodes on a network. Physical layer repeaters
shall not be interconnected in such a way as to create a loop.
Each port of a physical layer repeater shall meet the specifications stated in 6.2, 6.3.3, and 6.4. The delay
through the repeater shall not exceed 36 µs.
4.4 Cable Termination
4.4.1 Free-topology Segment
A free-topology segment shall have a single termination. If the segment is locally powered, an RC
network as shown in Figure 1 shall be used, with R1 = 52,3 Ω ± 1 %, 1/8 W. The termination may be
located anywhere on the segment. If the segment is link-powered, the termination shall be provided by
the link power source. See Figure 5. The link power source and termination may be located anywhere on
the segment.
4.4.2 Bus Topology Segment
A bus topology segment shall have two terminations, one at each end of the bus. If the segment is locally
powered, an RC network as shown in Figure 1 shall be used, with R1 = 105 Ω ± 1 %, 1/8 W at each end.
If the segment is link-powered, the link power source shall provide one termination. See Figure 5. The
other termination shall be an RC network as shown in Figure 1, with R1 = 105 Ω ± 1 %, 1/8 W.

Key
1 Network Connection
Figure 1 — Termination
6

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