1、DRAFT FOR DEVELOPMENT DD ENV 1805-2:1996 Data communication for HVAC Application Management Net Part 2: System neutral data transmission by open communication for building automation (FND) ICS 35.240.60; 97.120DD ENV 1805-2:1996 This Draft for Development, having been prepared under thedirection of
2、the Engineering Sector Board, was published underthe authority of the Standards Board and comes intoeffect on 15April1996 BSI 03-2000 The following BSI references relate to the work on this DraftforDevelopment: Committee reference RHE/16/1 ISBN 0 580 25357 0 Committees responsible for this Draftfor
3、Development The preparation of this Draft for Development was entrusted by Technical Committee RHE/16, Controls for HVAC, to Subcommittee RHE/16/1, Management systems for buildings, upon which the following bodies were represented: Association of Consulting Engineers Association of Control Manufactu
4、rers TACMA (BEAMA Ltd.) British Combustion Equipment Manufacturers Association Building Services Research and Information Association Department of the Environment (Building Research Establishment) Electrical Contractors Association Energy Systems Trade Associations HEVAC Association Co-opted member
5、s Amendments issued since publication Amd. No. Date CommentsDD ENV 1805-2:1996 BSI 03-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of ENV 1805-2 5DD ENV 1805-2:1996 ii BSI 03-2000 National foreword This Draft for Development has been prepared by
6、 Subcommittee RHE/16/1 and is the English language version of ENV1805 Data communication for HVAC application management net Part2:1995 System neutral data transmission by open communication for building automation (FND), published by the European Committee for Standardization (CEN). ENV1805-2:1995
7、was produced as a result of international discussions in which the UK took an active part. This publication is not to be regarded as a British Standard. It is being issued in the Draft for Development series of publications and is of a provisional nature. It should be applied on this provisional bas
8、is so that information and experience of its practical application may be obtained. Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the European organization responsible for its conversion to a European Standard. A review of this pub
9、lication will be initiated2 years after its publication by the European organization so that a decision can be taken on its status at the end of its three-year life. The commencement of the review will be notified by an announcement in BSI News. According to the replies received by the end of the re
10、view period, the responsible BSI Committee will decide whether to support the conversion into a European Standard, to extend the life of the prestandard or to withdraw it. Comments should be sent in writing to the Secretary of BSI Technical Committee RHE/16 at389 Chiswick High Road, London W44AL giv
11、ing the document reference and clause number and proposing, where possible, and appropriate revision of the text. Cross-reference Publication referred to Corresponding British Standard ISO 4903:1989 BS ISO 4903:1989 Information technology. Data communication. 15-pole DTE/DCE interface connector and
12、contact number assignments Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theENV title page, pages 2 to 76, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will b
13、e indicated in the amendment table on the inside front cover.EUROPEAN PRESTANDARD PRENORME EUROPENNE EUROPISCHE VORNORM ENV 1805-2 July 1995 ICS 35.240.60; 97.120 Descriptors: Automation, buildings, control device, data processing, data transfer, FND English version Data Communication for HVAC Appli
14、cation Management Net Part 2: System neutral data transmission by open communication for building automation (FND) This European Prestandard (ENV) was approved by CEN on1995-06-29 as a prospective standard for provisional application. The period of validity of this ENV is limited initially to three
15、years. After two years the members of CEN will be requested to submit their comments, particularly on the question whether the ENV can be converted into an European Standard (EN). CEN members are required to announce the existence of this ENV in the same way as for an EN and to make the ENV availabl
16、e promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the ENV) until the final decision about the possible conversion of the ENV into an EN is reached. CEN members are the national standards bodies of Austria, Belgium,
17、Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart
18、36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No. ENV 1805-2:1995 EENV 1805-2:1995 BSI 03-2000 2 Foreword This European prestandard (ENV) has been prepared by the Technical Committee CEN TC247
19、, Control for mechanical building service, of which the secretariat is held by SNV. This ENV1805-2 prestandard is part of a series of standards for system-neutral data communications in HVAC systems. This ENV1805-2 (FND) prestandard and the ENV1805-1 (BACnet) cover the data communications on the man
20、agement level and together form the prestandard for the management level. ENV1805-2 is an adoption of the German prestandard DIN V32735 “System-neutral data transmission by open communication for building automation (FND)” from January1991. The position of this standard in the whole range of standar
21、ds for mechanical building services and the normative sections of the BACnet standard included is illustrated inFigure 1. According to the CEN/CENELEC Internal Regulations, the following countries are bound to announce the European Prestandard: Austria, Belgium, Denmark, Finland, France, Germany, Gr
22、eece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Protugal, Spain, Sweden, Switzerland, United Kingdom. Figure 1 The shaded boxes indicate the contents and the hierarchy of this standard. The plain areas show the positioning of this standard in relationship to other relevant mechanical
23、 building services standardsENV 1805-2:1995 BSI 03-2000 3 Contents Page Foreword 2 0 Introduction 5 1 Scope 5 1.1 Field of application 5 1.2 Purpose 5 2 Normative references 6 3 FND communication model 6 3.1 Information exchange 6 3.2 Positioning of FND inside building automation systems 8 3.3 FND b
24、uilding automation model 9 3.4 Data points 11 3.5 Definitions 12 4 Description of data points 14 4.1 Transfer point 14 4.2 Signalling point 15 4.3 Switching point (with and without feedback) 18 4.4 Measuring point 21 4.5 Set point 26 4.6 Counting point 28 4.7 Collection point 32 5 FND-APDU format 37
25、 5.1 Survey 37 5.2 Data point status 41 6 Operational description 42 6.1 Commands 42 6.2 Messages 45 6.3 Disabling event messages 47 6.4 Access control 48 7 Segmentation 51 8 Communication process 52 8.1 General 52 8.2 invoke_id 53 8.3 dp_busy 53 8.4 Procedural specification 54 8.5 REJECT/ERROR cond
26、itions 57 9 Conformity assessment 59 9.1 Testing of an FND island control station interface 59 9.2 Testing of an FND control station interface 62 Annex A (informative) Authentication 68 Page Annex B (normative) Binary attributes and physical dimensions 68 Annex C (informative) Network interface 74 A
27、nnex D (normative) REJECT and ERROR codes 75 D.1 REJECT Coding 75 D.2 ERROR codes 75 D.3 Info-code in case of commands 75 D.4 Info-code in case of messages 75 Figure 1 FND communication model 7 Figure 2 X.21 plug according to ISO 4903:1989 8 Figure 3 Positioning of the FND 9 Figure 4 Addressing sche
28、me FND 10 Figure 5 Dialogue sequence CS-IS-DP 11 Figure 6 FND in the ISO layer model 12 Figure 7 info_event 16 Figure 8 info_event 19 Figure 9 info_event 22 Figure 10 update_control 24 Figure 11 info_event 27 Figure 12 info_event 29 Figure 13 update_control 31 Figure 14 info_event 34 Figure 15 FND-A
29、PDU format 37 Figure 16 41 Figure 17 Clarification of the modification authorization by the CS 50 Figure 18 Clarification of the modification authorization by the island 51 Figure 19 Sending and receiving pools 54 Figure 20 Procedure for Cmd/Usm send request 55 Figure 21 Procedure for Cmd/Usm indica
30、tion of receipt 56 Figure 22 REJECT/ERROR sequences 57 Figure 23 REJECT/ERROR sequences 58 Figure 24 ERROR APDU format 59 Figure 25 Testing procedure for an island control station interface 65 Figure 26 Island control station interfaces during testing 66 Figure 27 Testing procedure for a central con
31、trol station interface 66 Figure 28 Testing procedure for a central control station interface 67ENV 1805-2:1995 4 BSI 03-2000 Page Figure C.1 Decoupling of ATC from transportation system by NAC 74 Table 1 8 Table 2 12 Table 3 15 Table 4 DP_0 15 Table 5 DP_1 15 Table 6 Parameter survey 16 Table 7 17
32、Table 8 Operation survey 18 Table 9 Symbol explanation 18 Table 10 DP_0 18 Table 11 DP_1 18 Table 12 Parameter survey 20 Table 13 Parameter survey 20 Table 14 Operation survey 21 Table 15 Symbol explanation 21 Table 16 DP_0 21 Table 17 DP_1 21 Table 18 DP_2 22 Table 19 Admissible combinations in cas
33、e of requests 23 Table 20 Admissible combinations in case of spontaneous messages (X = 0 or 1) 23 Table 21 Parameter survey 23 Table 22 24 Table 23 Parameter survey 25 Table 24 Operation survey 25 Table 25 Symbol explanation 26 Table 26 DP_0 26 Table 27 DP_1 26 Table 28 Parameter survey 27 Table 29
34、Parameter survey 27 Table 30 Operation survey 27 Table 31 Symbol explanation 28 Table 32 DP_0 28 Table 33 DP_1 28 Table 34 DP_2 28 Table 35 30 Table 36 Parameter survey 30 Table 37 Parameter survey 31 Table 38 Operation survey 31 Table 39 Symbol explanation 32 Table 40 DP_0 32 Table 41 DP_1 33 Page
35、Table 42 DP_2 33 Table 43 Parameter survey 34 Table 44 Parameter survey 36 Table 45 Operation survey 36 Table 46 Symbol explanation 36 Table 47 38 Table 48 38 Table 49 39 Table 50 39 Table 51 Cmd frame 42 Table 52 Syntax of the operation code for commands 42 Table 53 Coding 43 Table 54 Coding 43 Tab
36、le 55 43 Table 56 44 Table 57 DP_2 44 Table 58 45 Table 59 Syntax of the operation code for messages 46 Table 60 46 Table 61 47 Table 62 Coding 48 Table 63 Cmd frame 48 Table 64 50 Table B.1 Coding of binary attributes 69 Table B.2 Coding of physical dimensions 71 Table C.1 74 Table D.1 75ENV 1805-2
37、:1995 BSI 03-2000 5 0 Introduction The FND is a communication protocol for building automation and control systems on the management net level. It is used for data transmission between a central station and one or more autonomous islands of automation stations. FND means vendor-independent and syste
38、m-neutral data transmission. The FND standard specifies the hardware, the software, the behaviour and the functionality of the interfaces provided by the central station and the corresponding island of automation stations. The protocol definition is based on the ISO/OSI Basic Reference Model. The FN
39、D protocol stack uses the layers1 to3 and layer7. The lower layers are identical to the International Standard CCITT X.21/X.25. Because of this WAN communication via public networks is possible. The realisation of the communication linkbetween the stations is a kind of a local matter. The network ca
40、n be any kind of LAN, WAN or even a point to point connection providing the FND interface. The layer7 contains the FND protocol. Using the communication objects specified all basic functions in building automation and control systems can be handled, i.e. read and command analogue and digital datapoi
41、nts and values, change limits of analogue datapoints and alarm handling. The main communication objects of layer7 are: Signalling point (digital input) Switching point (digital output) Measuring point (analogue input) Positioning point (analogue output) Counting point For error handling, authenticat
42、ion and transparent data transmission (e.g. files) additional objects are specified in the standard. The communication initiated by the central station uses the FND layer7 services command and response. The command service can contain a request for a value, a value for setting a datapoint etc. The a
43、utomation station sends a response either with or without an information depending on the previous command. If the automation station initiates the communication, the services unsolicited message and acknowledge are used. In that case something had happened in the automation island, e.g. a change of
44、 state, an alarm, that has to be reported to the central station. The unsolicited message is sent and the central station responds with an acknowledge. So, every communication between the automation systems uses a handshake procedure. 1 Scope 1.1 Field of application The FND is a communication proto
45、col for building automation and control systems on the management net level. It is used for data transmission between a central station and one or more autonomous islands of automation stations. The standard specifies the interface of the central station and of the island of automation stations for
46、communicating with each other. The network used for internetworking these systems is not part of this standard. The communication objects defined in this standard correspond to the basic functions of building automation and control systems. Therefore the information needed by the central station is
47、available from automation stations even if the vendors of the different systems are not identical. 1.2 Purpose This standard specifies the communication protocol on the interface of a central station and an island of automation stations. The protocol specification is based on the ISO/OSI Basic Refer
48、ence Model. The mechanical, electrical and functional behaviour of the interface is described and the bit structures and communication objects are specified.ENV 1805-2:1995 6 BSI 03-2000 This standard can be used for implementing the specified communication protocal and for describing the requiremen
49、ts for interworking with stations from different vendors. This standard describes the requirements that have to be placed on a building automation system with regard to a communication interface. The basic functions of the communication, the interface to (long-distance traffic capable) networks and the functionality that this standard makes available to the connected systems are determined. 2 No
