1、BSI Standards PublicationBS ISO 20211:2015Space data and informationtransfer systems SpacecraftOnboard Interface Services Device Access ServiceBS ISO 20211:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 20211:2015. The UK participation in its preparation
2、was entrusted to Technical Committee ACE/68, Space systems and operations.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct a
3、pplication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 87911 1 ICS 49.140 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Co
4、mmittee on 31 December 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 20211:2015 ISO 2015Space data and information transfer systems Spacecraft Onboard Interface Services Device Access ServiceSystmes de transfert des informations et donnes spatiales Services di
5、nterfaces bord des vhicules spatiaux Service daccs aux priphriquesINTERNATIONAL STANDARDISO20211First edition2015-08-15Reference numberISO 20211:2015(E)BS ISO 20211:2015ISO 20211:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll rights reserved.
6、 Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at
7、the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 20211:2015ISO 20211:2015(E) ISO 2015 All rights reserved iiiForeword ISO
8、(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 comm
9、ittee 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 electrote
10、chnical 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 memb
11、er 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 identifyi
12、ng any or all such patent rights. ISO 20211 was prepared by the Consultative Committee for Space Data Systems (CCSDS) (as CCSDS 871.0-M-1, March 2013) and was adopted (without modifications except those stated in clause 2 of this International Standard) by Technical Committee ISO/TC 20, Aircraft and
13、 space vehicles, Subcommittee SC 13, Space data and information transfer systems. BS ISO 20211:2015BS ISO 20211:2015Recommendation for Space Data System Practices SPACECRAFT ONBOARD INTERFACE SERVICESDEVICE ACCESS SERVICE RECOMMENDED PRACTICE CCSDS 871.0-M-1 MAGENTA BOOK March 2013 BS ISO 20211:2015
14、CCSDS RECOMMENDED PRACTICE FOR SOIS DEVICE ACCESS SERVICE CCSDS 871.0-M-1 Page i March 2013 AUTHORITY Issue: Recommended Practice, Issue 1 Date: March 2013 Location: Washington, DC, USA This document has been approved for publication by the Management Council of the Consultative Committee for Space
15、Data Systems (CCSDS) and represents the consensus technical agreement of the participating CCSDS Member Agencies. The procedure for review and authorization of CCSDS documents is detailed in Organization and Processes for the Consultative Committee for Space Data Systems (CCSDS A02.1-Y-3), and the r
16、ecord of Agency participation in the authorization of this document can be obtained from the CCSDS Secretariat at the address below. This document is published and maintained by: CCSDS Secretariat Space Communications and Navigation Office, 7L70 Space Operations Mission Directorate NASA Headquarters
17、 Washington, DC 20546-0001, USA ISO 20211:2015(E) ISO 2015 All rights reservedBS ISO 20211:2015CCSDS RECOMMENDED PRACTICE FOR SOIS DEVICE ACCESS SERVICE CCSDS 871.0-M-1 Page ii March 2013 STATEMENT OF INTENT The Consultative Committee for Space Data Systems (CCSDS) is an organization officially esta
18、blished by the management of its members. The Committee meets periodically to address data systems problems that are common to all participants, and to formulate sound technical solutions to these problems. Inasmuch as participation in the CCSDS is completely voluntary, the results of Committee acti
19、ons are termed Recommendations and are not in themselves considered binding on any Agency. CCSDS Recommendations take two forms: Recommended Standards that are prescriptive and are the formal vehicles by which CCSDS Agencies create the standards that specify how elements of their space mission suppo
20、rt infrastructure shall operate and interoperate with others; and Recommended Practices that are more descriptive in nature and are intended to provide general guidance about how to approach a particular problem associated with space mission support. This Recommended Practice is issued by, and repre
21、sents the consensus of, the CCSDS members. Endorsement of this Recommended Practice is entirely voluntary and does not imply a commitment by any Agency or organization to implement its recommendations in a prescriptive sense. No later than five years from its date of issuance, this Recommended Pract
22、ice will be reviewed by the CCSDS to determine whether it should: (1) remain in effect without change; (2) be changed to reflect the impact of new technologies, new requirements, or new directions; or (3) be retired or canceled. In those instances when a new version of a Recommended Practice is issu
23、ed, existing CCSDS-related member Practices and implementations are not negated or deemed to be non-CCSDS compatible. It is the responsibility of each member to determine when such Practices or implementations are to be modified. Each member is, however, strongly encouraged to direct planning for it
24、s new Practices and implementations towards the later version of the Recommended Practice. ISO 20211:2015(E) ISO 2015 All rights reservedBS ISO 20211:2015CCSDS RECOMMENDED PRACTICE FOR SOIS DEVICE ACCESS SERVICE CCSDS 871.0-M-1 Page iii March 2013 FOREWORD Through the process of normal evolution, it
25、 is expected that expansion, deletion, or modification of this document may occur. This Recommended Practice is therefore subject to CCSDS document management and change control procedures, which are defined in the Organization and Processes for the Consultative Committee for Space Data Systems (CCS
26、DS A02.1-Y-3). Current versions of CCSDS documents are maintained at the CCSDS Web site: http:/www.ccsds.org/ Questions relating to the contents or status of this document should be addressed to the CCSDS Secretariat at the address indicated on page i. ISO 20211:2015(E) ISO 2015 All rights reservedB
27、S ISO 20211:2015CCSDS RECOMMENDED PRACTICE FOR SOIS DEVICE ACCESS SERVICE CCSDS 871.0-M-1 Page iv March 2013 At time of publication, the active Member and Observer Agencies of the CCSDS were: Member Agencies Agenzia Spaziale Italiana (ASI)/Italy. Canadian Space Agency (CSA)/Canada. Centre National d
28、Etudes Spatiales (CNES)/France. China National Space Administration (CNSA)/Peoples Republic of China. Deutsches Zentrum fr Luft- und Raumfahrt e.V. (DLR)/Germany. European Space Agency (ESA)/Europe. Federal Space Agency (FSA)/Russian Federation. Instituto Nacional de Pesquisas Espaciais (INPE)/Brazi
29、l. Japan Aerospace Exploration Agency (JAXA)/Japan. National Aeronautics and Space Administration (NASA)/USA. UK Space Agency/United Kingdom. Observer Agencies Austrian Space Agency (ASA)/Austria. Belgian Federal Science Policy Office (BFSPO)/Belgium. Central Research Institute of Machine Building (
30、TsNIIMash)/Russian Federation. China Satellite Launch and Tracking Control General, Beijing Institute of Tracking and Telecommunications Technology (CLTC/BITTT)/China. Chinese Academy of Sciences (CAS)/China. Chinese Academy of Space Technology (CAST)/China. Commonwealth Scientific and Industrial Re
31、search Organization (CSIRO)/Australia. CSIR Satellite Applications Centre (CSIR)/Republic of South Africa. Danish National Space Center (DNSC)/Denmark. Departamento de Cincia e Tecnologia Aeroespacial (DCTA)/Brazil. European Organization for the Exploitation of Meteorological Satellites (EUMETSAT)/E
32、urope. European Telecommunications Satellite Organization (EUTELSAT)/Europe. Geo-Informatics and Space Technology Development Agency (GISTDA)/Thailand. Hellenic National Space Committee (HNSC)/Greece. Indian Space Research Organization (ISRO)/India. Institute of Space Research (IKI)/Russian Federati
33、on. KFKI Research Institute for Particle section 2, containing general concepts and assumptions; section 3, containing the Device Access Service, in terms of the services provided, services expected from underlying layers, and the service interface; section 4, containing the Management Information B
34、ase (MIB) for this service. In addition, one normative and three informative annexes are provided: annex A, comprising a Service Conformance Statement Proforma; annex B, discussing security considerations relating to the specifications of this document; annex C, containing a list of acronyms; annex
35、D, containing a list of informative references. ISO 20211:2015(E) ISO 2015 All rights reservedBS ISO 20211:2015CCSDS RECOMMENDED PRACTICE FOR SOIS DEVICE ACCESS SERVICE CCSDS 871.0-M-1 Page 1-2 March 2013 1.5 CONVENTIONS AND DEFINITIONS 1.5.1 DEFINITIONS 1.5.1.1 General For the purpose of this docum
36、ent the following definitions apply. 1.5.1.2 Definitions from the Open Systems Interconnection (OSI) Basic Reference Model This document is defined using the style established by the Open Systems Interconnection (OSI) Basic Reference Model (reference D2). This model provides a common framework for t
37、he development of standards in the field of systems interconnection. The following terms used in this Recommended Practice are adapted from definitions given in reference D2: (N)-layer: A subdivision of the architecture, constituted by subsystems of the same rank (N). (N)-protocol: A set of rules an
38、d formats (semantic and syntactic) which determines the communication behaviour of (N)-entities in the performance of (N)-functions. (N)-protocol-data-unit: A unit of data specified in an (N)-protocol and consisting of (N)-protocol-controlinformation and possibly (N)-user-data. (N)-service: Capabili
39、ty of a layer, and the layers beneath it (service providers), provided to the service users at the boundary between the service providers and the service users. (N)-service-access-point, (N)-SAP: The point at which (N)-services are provided by an (N)-entity to an (N+l)-entity. Within the spacecraft,
40、 a SOIS User SAP. As a minimum it locates a data system and an application within that data system. 1.5.2 TERMS DEFINED IN THIS RECOMMENDED PRACTICE For the purposes of this Recommended Practice, the following definitions also apply. application: Any component of the onboard software that makes use
41、of the DAS. NOTE Such components include flight software applications and higher-layer services. device: Real hardware component of the spacecraft or a single register within such a component. NOTE Examples of such component are sensors and actuators. ISO 20211:2015(E) ISO 2015 All rights reservedBS
42、 ISO 20211:2015CCSDS RECOMMENDED PRACTICE FOR SOIS DEVICE ACCESS SERVICE CCSDS 871.0-M-1 Page 1-3 March 2013 physical device identifier: Abstract identification of a device. NOTE The format of a device identifier is implementation-specific. remotely connected device: Device that for access requires
43、the use of a device-specific access protocol that connects two different instances of the DAS in such a way that the first relays the user requests to the second, which in turn directly accesses the remote device. timestamp: Time associated with a value. NOTES 1 The format of a timestamp is implemen
44、tation-specific. 2 The timestamp may indicate the time the value was generated by the device, emitted by the device, or acquired by the service. This is implementation-specific. value: Formatted atomic unit of data that is acquired from or used as a command to a device. value identifier: Abstract id
45、entification of a value. NOTE The format of a value identifier is implementation-specific. 1.6 NOMENCLATURE 1.6.1 NORMATIVE TEXT The following conventions apply for the normative specifications in this Recommended Practice: a) the words shall and must imply a binding and verifiable specification; b)
46、 the word should implies an optional, but desirable, specification; c) the word may implies an optional specification; d) the words is, are, and will imply statements of fact. NOTE These conventions do not imply constraints on diction in text that is clearly informative in nature. ISO 20211:2015(E)
47、ISO 2015 All rights reservedBS ISO 20211:2015CCSDS RECOMMENDED PRACTICE FOR SOIS DEVICE ACCESS SERVICE CCSDS 871.0-M-1 Page 1-4 March 2013 1.6.2 INFORMATIVE TEXT In the normative sections of this document, informative text is set off from the normative specifications either in notes or under one of
48、the following subsection headings: Overview; Background; Rationale; Discussion. 1.7 REFERENCES This document contains no normative references. Informative references are contained in annex D. ISO 20211:2015(E) ISO 2015 All rights reservedBS ISO 20211:2015CCSDS RECOMMENDED PRACTICE FOR SOIS DEVICE AC
49、CESS SERVICE CCSDS 871.0-M-1 Page 2-1 March 2013 2 OVERVIEW 2.1 FUNCTION The DAS provides a standard interface between onboard software applications and flight hardware such as sensors and actuators. 2.2 CONTEXT The DAS is defined within the context of the overall SOIS architecture (reference D3) as one of the Command and Data Acquisition services of the Application Support Layer, as illustrated in figure 2-1. Figure 2-1: Com
