1、BSI Standards PublicationBS EN 14908-4:2014Open Data Communication inBuilding Automation, Controlsand Building Management Control Network ProtocolPart 4: IP CommunicationBS EN 14908-4:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 14908-4:2014.It supersede
2、s BS EN 14908-4:2006 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee RHE/16, Performance requirements for control systems.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport
3、to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 79427 8ICS 35.240.99; 91.140.01; 97.120Compliance with a British Standard cannot confer immunity fromle
4、gal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 May 2014.Amendments issued since publicationDate Text affectedBS EN 14908-4:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14908-4 April 2014 ICS 35.240.99; 91.140.01
5、; 97.120 Supersedes EN 14908-4:2006English Version Open Data Communication in Building Automation, Controls and Building Management - Control Network Protocol - Part 4: IP Communication Rseau ouvert de communication de donnes pour lautomatisation, la rgulation et la gestion technique du btiment - Pr
6、otocole de contrle du rseau - Partie 4: Communication par IP Offene Datenkommunikation fr die Gebudeautomation und Gebudemanagement - Gebude-Netzwerk-Protokoll -Teil 4: Kommunikation mittels Internet Protokoll (IP) This European Standard was approved by CEN on 12 April 2013. CEN members are bound to
7、 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 CEN-CE
8、NELEC Management Centre 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 CEN-CENELEC Management Centre has t
9、he same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxem
10、bourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brusse
11、ls 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14908-4:2014 EBS EN 14908-4:20142 Contents Foreword . 4 Introduction 5 1 Scope 6 2 Normative references . 6 3 Terms, definitions and abbreviations . 7 3.1 Terms and definition
12、s . 7 3.2 Abbreviations 8 4 Requirements 8 5 CNP/IP device specification . 9 5.1 IP Related device specifications . 9 5.2 CNP related device specifications 9 5.2.1 Packet formats 9 5.2.2 Addressing schemes 9 6 IP channel 10 6.1 Specification 10 6.2 IP transport mechanisms . 12 6.2.1 General . 12 6.2
13、.2 Informative considerations 13 7 CNP/IP device 13 7.1 Configuration of a CNP/IP device 13 7.2 Configuration parameters 14 7.2.1 General . 14 7.2.2 Channel definition parameters 14 7.2.3 Send List arameters 15 7.2.4 Device parameters 15 7.3 Configuration techniques. 15 7.3.1 General . 15 7.3.2 Manu
14、al configuration 16 7.3.3 BOOTP and DHCP . 16 7.3.4 Configuration servers . 16 8 CNP/IP messages 17 8.1 Definition of CNP/IP messages and modes of operation 17 8.2 Common message header . 17 8.3 Packet segmentation 19 8.3.1 Overview 19 8.3.2 Segment exchange . 20 8.3.3 Discussion . 21 8.4 Data packe
15、t exchange 22 8.4.1 General . 22 8.4.2 Out of order packets . 23 8.4.3 Duplicate packet detection 24 8.4.4 Stale packet detection 24 8.5 Configuration server interactions . 25 BS EN 14908-4:2014 EN 14908-4:2014 (E)BS EN 14908-4:20143 8.5.1 General device interaction . 25 8.5.2 General protocol inter
16、action 27 8.5.3 Packet Segmentation 27 8.5.4 Device Registration . 28 8.5.5 Channel Membership 30 8.5.6 Send List 31 8.5.7 Channel Routing . 32 8.6 Miscellaneous Status Messages . 34 8.6.1 General . 34 8.6.2 CNP/IP Device Status 34 8.6.3 Device Configuration 36 8.6.4 Device Send List . 36 8.6.5 Chan
17、nel Membership List 37 8.6.6 Channel routing information 37 8.7 Vendor Specific Messages . 37 8.8 Authentication of CNP Packets . 38 9 Packet formats 39 9.1 Packet Types . 39 9.2 Common CNP/IP Header 40 9.3 Segment Packet 42 9.4 CNP Data Packets . 43 9.5 CNP/IP Device Registration/configuration pack
18、ets . 44 9.6 Channel Membership Packet . 48 9.7 Channel Routing Packet . 49 9.8 Request Packet . 52 9.9 Acknowledge Packet 54 9.10 Send List Packet . 55 9.11 Node Status/Health/Statistics Response Message . 55 Annex A (normative) Specifications for the CNP standard 59 Annex B (informative) Specifica
19、tions for CNP. 61 Bibliography . 62 BS EN 14908-4:2014 EN 14908-4:2014 (E)BS EN 14908-4:20144 Foreword This document (EN 14908-4:2014) has been prepared by Technical Committee CEN/TC 247 “Building Automation, Controls and Building Management”, the secretariat of which is held by SNV. This European S
20、tandard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2014 and conflicting national standards shall be withdrawn at the latest by October 2014. Attention is drawn to the possibility that some of the elements o
21、f this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 14908-4:2006. This European Standard is part of a series of standards for open data transmission in building automation, co
22、ntrol and in building management systems. The content of this European Standard covers the data communications used for management, automation/control and field functions. EN 14908-4 is part of a series of European Standards under the general title Control Network Protocol (CNP), which comprises the
23、 following parts: Part 1: Protocol stack Part 2: Twisted pair communication Part 3: Power line channel specification Part 4: IP-Communication Part 5: Implementation Part 6: Application elements According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following c
24、ountries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
25、 Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 14908-4:2014 EN 14908-4:2014 (E)BS EN 14908-4:20145 Introduction This European Standard has been prepared to provide mechanisms through which various vendors of building automation, contr
26、ol, and building management systems may exchange information in a standardised way. It defines communication capabilities. This European Standard will be used by all involved in design, manufacture, engineering, installation and commissioning activities. BS EN 14908-4:2014 EN 14908-4:2014 (E)BS EN 1
27、4908-4:20146 1 Scope This European Standard specifies the transporting of the Control Network Protocol (CNP) packets for commercial Building Automation, Controls and Building Management over Internet Protocol (IP) networks using a tunnelling mechanism wherein the CNP packets are encapsulated within
28、IP packets. It applies to both CNP nodes and CNP routers. The purpose of this European Standard is to ensure interoperability between various CNP devices that wish to use IP networks to communicate using the CNP protocol. The main body of this European Standard is independent of the CNP protocol bei
29、ng transported over the IP network. The reader is directed to Annex A and Annex B for the normative and informative, respectively, aspects of this specification that are specific to EN 14908-1. Figure 1 shows a possible configuration of such CNP devices and networks connected to an IP network. Figur
30、e 1 Typical CNP/IP application Figure 1 depicts two types of CNP devices: CNP nodes and CNP routers. It should be noted that the routers shown can route packets between typical CNP channels (such as twisted pair or power line) and an IP channel or it can route CNP packets between two IP channels. In
31、 this European Standard the IP channel will be defined in such a way to allow it to be used like any other CNP channel. In the above diagram, the IP network can be considered to be one or more IP channels. This European Standard covers only how CNP packets are transported over IP channels. It does n
32、ot cover how CNP packets are routed between standard CNP channels and IP channels. This specification is not intended to cover the lower layers (physical, MAC and link layers) of either standard CNP or IP channels. 2 Normative references Not applicable. BS EN 14908-4:2014 EN 14908-4:2014 (E)BS EN 14
33、908-4:20147 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 tunnelling encapsulation of one protocols packet within the payload of another protocols packets 3.1.2 channel common communications transp
34、ort mechanism that a specific collection of CNP devices share and communicate over without the use of a router Note 1 to entry: Channels are used to transport CNP packets below the link layer of the CNP protocol stack. Note 2 to entry: Typically this refers to some type of physical media such as pow
35、er line, RF, or twisted pair, but in the case of IP networks this channel is not physical, but a protocol tunnel. 3.1.3 CNP device device that uses the CNP protocol to communicate with other CNP devices Note 1 to entry: Specifically, a CNP/IP device is a CNP device that communicates with other CNP d
36、evices over an IP channel. 3.1.4 CNP router special type of CNP device that routes CNP protocol packets between two or more channels Note 1 to entry: Specifically, a CNP/IP router is a CNP router in which at least one of the channels it routes packets over is an IP channel. 3.1.5 CNP node special ty
37、pe of CNP device that can send or receive CNP protocol packets, but does not route them between channels Note 1 to entry: Specifically a CNP/IP node is a CNP node in which at least one of the channels it sends and receives packets over is an IP channel. Note 2 to entry: All CNP devices are either ro
38、uters, nodes or both. 3.1.6 CNP group collection of CNP devices that share a common multicast address 3.1.7 node ID logical network address that differentiates nodes within the same subnet or domain 3.1.8 Must Be Zero (MBZ) reserved field that may be used in the following versions of the protocol BS
39、 EN 14908-4:2014 EN 14908-4:2014 (E)BS EN 14908-4:20148 Note 1 to entry: Such fields will be sent as zero and ignored by the receiver in implementations conforming to the current version of the specification. 3.2 Abbreviations CTP Channel Timeout Period CNP Control Network Protocol LFS Last Forwarde
40、d Sequence MBZ Must Be Zero NTP Network Time Protocol PSN Packet Sequence Number SA/DA Source Address / Destination Address SID Session Identifier SNTP Simple Network Time Protocol UDP User Datagram Protocol 4 Requirements The following is a set of general requirements for the transporting of CNP pa
41、ckets over IP channels: be as efficient as possible to allow quasi real-time operation; be independent of the application level interface used to receive the packets. For example the tunnelling protocol should not rely on the existence of a socket interface or how that interface may be used; ensure
42、that CNP packet ordering is preserved; ensure that CNP packets that are “stale” (outside the maximum timeout characteristics of the IP channel) are not forwarded; detect packets that get duplicated in the IP network; support IP routing devices that prioritise IP packets; optional security measures t
43、o prevent malicious users from tampering with devices; scalable; allow status information to be extracted from CNP/IP devices; support the exchange of configuration information between CNP/IP devices and configuration servers. BS EN 14908-4:2014 EN 14908-4:2014 (E)BS EN 14908-4:20149 5 CNP/IP device
44、 specification 5.1 IP Related device specifications A CNP/IP device shall behave like any standard IP host capable of exchanging IP packets with any other IP host either on the same IP subnet or anywhere else in the Internet cloud. A CNP/IP device shall have a single unicast IP address and may be ca
45、pable belonging to as many as 32 multi-cast groups. It is optional that a CNP/IP device support multi-casting. This document does not address the routing of IP packets between subnets or through the Internet. The CNP/IP devices shall be compatible with whatever standard mechanisms (IP routers, switc
46、hes etc.) are required to perform the IP routing functions. 5.2 CNP related device specifications 5.2.1 Packet formats The general format of CNP packets which are tunnelled over the IP channel are those packets that are received from or sent to the Link layer (layer 2) of the CNP protocol stack. Ref
47、er to Annex A for a precise specification of the packet formats corresponding to the CNP protocol. 5.2.2 Addressing schemes Different CNP protocols generally use different addressing schemes to exchange packets. Although it is generally not necessary to understand the contents of a CNP packet or its
48、 addresses in order to tunnel CNP packets over IP, some aspects of the CNP addressing scheme are reflected in the process of configuration. This is especially true when it comes to setting up the IP channels that are used for tunnelling. Since CNP protocols use different addressing schemes the termi
49、nology used in the main body of this specification for describing addresses are meant to be general and rich enough to describe the superset of addressing schemes used in all CNP protocols. The following CNP addressing terms are used in this specification. Unique ID. This refers to an ID that is globally unique to all devices within a specific protocol. Unique IDs are generally fixed in nature in that they never change through the life of a device. Domain. This is the highest level of a three level hierarchical addressing scheme. Domain IDs
