SAE-AS-5652-2005.pdf
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1、 AEROSPACE STANDARD 10 Megabit/sec Network Configuration Digital Time Division Command/Response Multiplex Data Bus SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely volunta
2、ry, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your writ
3、ten comments and suggestions. Copyright 2005 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permis
4、sion of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-0790 Email: custsvcsae.org SAE WEB ADDRESS: http:/www.sae.org Issued 2005-12 AS5652 RATIONALE This standard was developed as part of a request by the United States Air Force
5、 to provide a new miniature munitions interface. The specified charter was to identify, from a pool of mature, available products, a digital communications protocol that best supports the requirements of efficient and cost effective digital data transfer. A Star 10 MHz architecture, using RS-485 tra
6、nsceivers and the MIL-STD-1553B, Notice II protocol was chosen as the most appropriate base for the design, given time and implementation requirements. FOREWORD This standard was developed in conjunction with the Miniature Munitions Interface Standard in order to support a distributed RT point-to-po
7、int network configuration. TABLE OF CONTENTS 1. SCOPE 3 1.1 Purpose3 1.2 Field of Application4 2. REFERENCES.4 2.1 Applicable Documents .4 2.1.1 SAE Publications4 SAE AS5652 - 2 - 2.1.2 U.S. Government Publications.4 2.1.3 TIA Publications.4 2.2 Definitions 5 2.3 Acronymns and Abbreviations .8 3. GE
8、NERAL REQUIREMENTS10 3.1 Test and Operating Requirements10 3.2 Data Bus Operation.10 3.3 Characteristics .11 3.3.1 Data Form11 3.3.2 Bit Priority.11 3.3.3 Transmission Method.11 3.4 Terminal Operation 24 3.4.1 Common Operation24 3.4.2 Bus Controller Operation25 3.4.3 Remote Terminal25 3.4.4 Monitor
9、Operation 26 3.5 Hardware Characteristics.26 3.5.1 Data Bus Characteristics26 3.5.2 Terminal Characteristics 28 4. OPERATIONAL MODES AND GUIDELINES33 4.1 Bus Controller and Logical Hub .33 4.1.1 Logical Hub33 4.2 Multiplex Selection Criteria.36 4.3 Line Connections .36 4.4 Required Mode Codes.37 4.5
10、 Use of Broadcast Option37 SAE AS5652 - 3 - 1. SCOPE: This SAE Aerospace Standard (AS) contains requirements for a digital time division command/response multiplex data bus, for use in systems integration that is functionally similar to MIL-STD-1553B with Notice 2 but with a star topology and some d
11、eleted functionality. Even with the use of this document, differences may exist between multiplex data buses in different system applications due to particular application requirements and the options allowed in this document. The system designer must recognize this fact and design the multiplex bus
12、 controller (BC) hardware and software to accommodate such differences. These designer selected options must exist to allow the necessary flexibility in the design of specific multiplex systems in order to provide for the control mechanism, architectural redundancy, degradation concept, and traffic
13、patterns peculiar to the specific application requirements. 1.1 Purpose: This document establishes requirements for digital, command/response, time division multiplexing (Data bus) techniques. It encompasses the data bus line and its interface electronics illustrated on Figure 1, and also defines th
14、e concept of operation and information flow on the multiplex data bus and the electrical and functional formats to be employed. Bus Controller RTRT Up to 31 Remote Terminal Addresses 0 - 30 FIGURE 1 - Data Bus Network Configuration -,-,- SAE AS5652 - 4 - 1.2 Field of Application: When invoked in a s
15、pecification or statement of work, these requirements shall apply to the multiplex data bus and associated equipment which is developed either alone or as a portion of a Miniature Mission Store weapon system or subsystem development. The contractor is responsible for invoking all the applicable requ
16、irements of this standard on any and all subcontractors he may employ. 2. REFERENCES: 2.1 Applicable Documents: The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publications shall b
17、e the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has b
18、een obtained. 2.1.1 SAE Publications: Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. ARP4242 Electromagnetic Compatibility Control Requirements, System 2.1.2 U.S. Government Publications: Av
19、ailable from Document Automation and Production Service (DAPS), Building 4/D, 700 Robbins Avenue, Philadelphia, PA 19111-5094, Tel: 215-697-6257, http:/assist.daps.dla.mil/quicksearch/ MIL-STD-1553B Digital Time Division Command/Response Multiplex Data Bus MIL-STD-464 Electromagnetic Environmental E
20、ffects, Requirements for Systems 2.1.3 TIA Publications: Available from TIA, Standards and Technology Department, 2500 Wilson Boulevard, Arlington, VA 22201, www.tiaonline.org/standards/ TIA/EIA-485-A 21 Electrical Characteristics of Generators and Receivers for (ANSI/TIA/EIA-485-A-98) Use in Balanc
21、ed Multipoint Systems SAE AS5652 - 5 - 2.2 Definitions: ASYNCHRONOUS OPERATION: For the purpose of this standard, asynchronous operation is the use of an independent clock source in each terminal for message transmission. Decoding is achieved in receiving terminals using clock information derived fr
22、om the message. BIT RATE: The number of bits transmitted per second. BIT: Contraction of binary digit: may be either zero or one. In information theory a binary digit is equal to one binary decision or the designation of one of two possible values or states of anything used to store or convey inform
23、ation. BROADCAST: Operation of a data bus system such that information transmitted by the bus is addressed to more than one of the remote terminals connected to the data bus. Bus Controller (BC): The terminal assigned the task of initiating information transfers on the data bus. BUS MONITOR (BM): Th
24、e terminal assigned the task of listening to Logical Hub activity with ability to extract selected information, to be used at a later time. Bus Monitor may be stand alone or incorporated into another terminal. COMMAND/RESPONSE: Operation of a data bus system such that remote terminals receive and tr
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