1、AEROSPACESTANDARDIssued 1989-01AS4115TEST PLAN FOR THE DIGITAL TIME DIVISION COMMAND/RESPONSE MULTIPLEX DATA BUS SYSTEMTABLE OF CONTENTSPARAGRAPH TEST PAGE1. SCOPE 41.1 General 41.2 Application 42. APPLICABLE DOCUMENTS 42.1 Standards, Military 42.2 Other Documents 53. DEFINITIONS 53.1 BC-Bus Control
2、ler 53.2 RT-Remote Terminal 53.3 Message 53.4 Responses 53.4.1 CS-Clear Status 53.4.2 Respond In Form 53.5 Valid Word 53.6 Illegal Bus Traffic 53.7 Backup BC 54. GENERAL TEST REQUIREMENTS 64.1 General Monitoring Requirements 64.2 TDR Considerations 65. DETAILED REQUIREMENTS 65.1 Bus Network Tests 65
3、.1.1 Continuity 75.1.1.1 Shield Continuity 75.1.1.2 Bus Continuity 7Reaffirmed 2011-11RATIONALEThis document has been reaffirmed to comply with the SAE 5-year Review policy. SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engin
4、eering sciences. The use of this report is entirely voluntary, 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
5、be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions.Copyright 2011 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, p
6、hotocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.orgSAE values your input. To provi
7、de feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AS4115Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AS4115Page 2TABLE OF CONTENTS(Continued)PARAGRAPH TEST P
8、AGE5.1.1.3 Bus Isolation 85.1.1.4 Transformer-Coupled Stubs 85.1.1.5 Transformer-Coupled Fault Isolation Resistance 85.1.1.6 Transformer-Coupled Isolation 85.1.2 Impedance 95.1.2.1 Bus Impedance 95.1.2.2 Stub Impedance for Transformer-Coupled Stubs 95.1.3 Dynamic Fault Effects 95.1.4 Attenuation 105
9、.1.4.1 Bus Attenuation 105.1.4.2 Bus/Coupler Attenuation 105.1.5 Bus Isolation 105.1.5.1 Redundant Bus Isolation 115.1.5.2 Multiple Bus Isolation 115.1.6 Common Mode Rejection 115.1.7 Distortion 115.1.7.1 Zero Crossing Distortion 125.1.7.2 Waveform Distortion 125.1.7.3 Symmetry 135.1.8 Data Path Int
10、egrity 145.2 System Integration Tests 145.2.1 Introduction 145.2.2 Assumptions 155.2.3 Power Up Sequence 155.2.3.1 RT Power-Up 155.2.3.2 BC Power-Up 155.2.4 Normal Operation 165.2.4.1 Definition 165.2.4.2 Monitor for Proper Sequencing 165.2.4.3 Operational Modes 165.2.4.4 Exercise of Options 165.2.4
11、.4.1 Dynamic Bus Control 165.2.4.4.1.1 Acceptance 165.2.4.4.1.2 Rejection 175.2.4.4.2 Backup BC 175.2.4.4.3 Service Request 175.2.4.4.4 Busy 175.2.4.4.5 Mode Commands 175.2.4.4.6 Emergency Power Operation 175.2.5 Error Monitoring 175.2.6 Error Handling Procedures 185.2.6.1 RT-RT Transfers 185.2.6.2
12、Suppressed Response 185.2.6.3 Power Cycle Test 185.2.6.4 Backup Bus Controller Operation 195.2.6.5 Bus Retries 19Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AS4115Page 3TABLE OF CONTENTS(Continue
13、d)PARAGRAPH TEST PAGE5.2.6.6 Subsystem Reset 195.2.6.7 Bus Switching 195.2.6.8 Illegal Commands 195.2.7 Multiple Bus Architectures 195.2.7.1 Introduction 195.2.7.2 Data Validity 205.2.7.3 Latency 205.2.7.4 Deadlock 205.2.8 Mixing 1553 (USAF), 1553A and 1553B Terminals 205.2.8.1 Status Word Bits 205.
14、2.8.2 Mode Commands 205.2.8.2.1 Defined Mode Commands 205.2.8.2.2 Subaddress/Mode Field 215.2.8.3 Response Time 215.2.8.4 Coupler Variations 215.2.8.5 Voltage Levels 215.2.8.5.1 Output Voltage 215.2.8.5.2 Input Voltage 225.2.8.6 Terminal Address 22LIST OF FIGURESFIGURE TITLE PAGE1 Transformer Couple
15、d Stub DC Resistance 232 Bus Impedance Test Configuration 243 Stub Impedance Test Configuration 254 Bus Attenuation Test Configuration 265 Stub Attenuation Test Configuration 276 Bus Isolation 287 Common Mode Test Configuration 298 Waveform Distortion 309 Output Symmetry 30Copyright SAE Internationa
16、l Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AS4115Page 41. SCOPE:This test plan consists of two major sections for testing of MIL-STD-1553B data bus systems: BusNetwork and System Integration Tests.1.1 General: This test
17、plan defines the test requirements for:a. Verifying that the bus network, (that is, cabling, couplers, connectors and terminators) when in the final system design configuration, complies with the requirements of MIL-STD-1553B.b. Ensuring that when the bus system (that is, bus network, remote termina
18、ls and bus controllers) is integrated, it meets the specific requirements of MIL-STD-1553B, and provides for reliable communications within its system environment.1.2 Application: This is a general test plan for any data bus system designed to meet the requirements of MIL-STD-1553B. These requiremen
19、ts shall apply to the bus system when invoked in a specification or statement of work. The requirements of this test plan may be used in both design verification and production tests.Tests specified herein may be performed in any order unless otherwise noted. For example, to minimize movement of tes
20、t equipment, system tests may be combined with one another or combined with other tests of the system in which the data bus is used.When this test plan is used for design verification, all remote terminal and bus controller designs should have been validated as per the “Validation Test Plan for the
21、Digital Internal Time Division Command/Response Multiplex Data Bus Remote Terminals” and “Validation Test Plan for the Digital Internal Time Division Command/Response Multiplex Data Bus Bus Controllers.”When this test plan is used for production testing, all remote terminal and bus controller equipm
22、ent should have been tested as per the “Production Test Plan for Digital Internal Time Division Command/Response Multiplex Data Bus Remote Terminals” and “Production Test Plan for the Digital Internal Time Division Command/Response Multiplex Data Bus Bus Controllers.”Special requirements such as tho
23、se needed to meet armament bus requirements when specified in the individual system specification may, when within 1553B requirements, replace values or tolerances specified in this test plan for the purpose of generating a system test procedure.2. APPLICABLE DOCUMENTS:2.1 Standards, Military:MIL-ST
24、D-1553 (USAF), Aircraft Internal Time Division Command/Response Multiplex Data Bus, 30 Aug. 1973MIL-STD-1553A, 30 Apr. 1975MIL-STD-1553B, 21 Sept. 1978 with Notice 1, 12 Feb. 1980 and with Notice 2, 8 Sept. 1986Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reprod
25、uction or networking permitted without license from IHS-,-,-AS4115Page 52.2 Other Documents:a. SAE AS 4113, Validation Test Plan for the Digital Time Division Command/Response Multiplex Data Bus Bus Controllersb. MIL-HDBK-1553 Notice 1, 24 September 1986, Validation Test Plan for the Digital Time Di
26、vision Command/Response Multiplex Data Bus Remote Terminalsc. SAE AS 4114, Production Test Plan for the Time Division Command/Response Multiplex Data Bus Bus Controllersd. SAE AS 4112, Production Test Plan for the Digital Time Division Command/Response Multiplex Data Bus Remote Terminals3. DEFINITIO
27、NS:3.1 BC - Bus Controller: As defined in the paragraph titled “Bus Controller” of MIL-STD-1553.3.2 RT - Remote Terminal: As defined in the paragraph titled “Remote Terminal” of MIL-STD-1553.3.3 Message: A single message is the transmission of a command word, status word and data word(s) if they are
28、 specified. For the case of a remote terminal to remote terminal (RT-RT) transmission, the message shall include the two command words, status word(s) and data word(s).3.4 Responses: The following are definitions of RT responses as used in this test plan. In each case, the status word must have the
29、correct terminal address and unused status bits set to zero.3.4.1 CS - Clear Status: The status word may have the busy bit or service request bit set, or both. All other status code bits in the status word must be zero and the associated message must have the proper word count.3.4.2 Respond in Form:
30、 A remote terminal is said to “respond in form” if its response to an illegal command as defined in the “Illegal Commands” paragraph of MIL-STD-1553B consists of a response formatted as though it were a legal command.3.5 Valid Word: A valid word is one which conforms to the criteria of the “Word Val
31、idation” paragraph of MIL-STD-1553B.3.6 Illegal Bus Traffic: That traffic which consists of illegal commands and the data and responses associated with those commands.3.7 Backup BC: Backup BC is here defined as a terminal on the bus that has the capability to become primary BC.Copyright SAE Internat
32、ional Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AS4115Page 64. GENERAL TEST REQUIREMENTS:The following paragraphs define the configurations, pass/fail criteria, and general procedures for testing data bus systems. Specifi
33、cally, this document contains the test configurations and procedures for the Bus Network Tests (5.1) and the System Integration Tests (5.2) for MIL-STD-1553B data bus systems.4.1 General Monitoring Requirements: In addition to the specific tests that follow, certain terminal parameters must be conti
34、nuously monitored throughout all system integration tests. These parameters are:a. Remote terminal response timeb. Contiguous datac. Proper Manchester encodingd. Proper bit counte. Odd parityf. Proper terminal addresses in the status wordg. Proper word counth. Reserved status and instrumentation bit
35、s in the status word responses set to zeroi. Proper syncj. Proper intermessage gapk. Illegal bus trafficThe data bus system shall have failed the test if, at any time during the test, any of these parameters fail to meet the requirements of MIL-STD-1553B.4.2 Time Domain Reflectometry (TDR) Considera
36、tions: Although the individual tests do not require the use of a TDR, valuable network characterization data can be obtained by the proper use of a TDR. The TDR may prove even more useful in testing a bus network where stub connections or ends of the bus are not easily accessible to the test equipme
37、nt. The TDR placed at one end of the bus would provide data on bus termination mismatch, stub impedance differences, and open and shorted stubs.5. DETAILED REQUIREMENTS:5.1 Bus Network Tests: The purpose of these tests is to verify the bus network as a separate entity, prior to bus controller and re
38、mote terminal integration. In the tests defined below, any reference to BC or RT refers to the use of test equipment simulating that function.All tests shall be performed during validation testing. Production tests shall encompass as many of the tests as possible, but shall include the Data Path Int
39、egrity test of 5.1.8. It is recognized that some of the tests may not be possible due to lack of physical access to specific test points in the production configuration.Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without lic
40、ense from IHS-,-,-AS4115Page 75.1 (Continued):Unless otherwise noted, all terminal positions not under test shall be terminated at the terminal end of the stub as follows:a. 1000 for transformer coupled stubsb. 2000 for direct coupled stubsWhen a terminal output amplitude is specified, its output le
41、vel shall be verified when bus conditions change, that is, shorting a stub or removing a coupler. When directed to “short a stub,” the stub shall be loaded at the terminal end of the stub as follows:a. 0 for a transformer coupled stubb. 110 for a direct coupled stub5.1.1 Continuity: The purpose of t
42、his test is to perform DC continuity and resistance measurements on the bus network. This test is optional. It may be performed following the failure of the data integrity test in 5.1.8 to aid in isolation of a problem area. It may also be performed as an aid in isolating simple continuity problems
43、prior to other bus network tests if continuity measurement points are easily accessible. The following tests in this section shall be undertaken with all stubs open circuit at the terminal end of the stub.5.1.1.1 Shield Continuity: Continuity of the shield shall be measured at each connection point
44、on the bus network. The measurement point may be the shield braid or the outer metal shell of the bus network components. The measurement shall be made at each bus terminator and each terminal connection. Continuity measurements may be made between adjacent points along the bus network to minimize t
45、he length of test measurement cables. All measurements shall be less than 0.012 /ft. In order to ensure that measurements reflect actual shield continuity figures, and not continuity through system ground, the bus network must be isolated from the system ground. Should this not be possible, then eit
46、her the bus harness shall be tested prior to installation or point-to-point measurements shall be taken on stubs and bus sections.5.1.1.2 Bus Continuity: This test may be omitted in installations where the two bus terminators are an integral part of the bus network (that is, the terminators are not
47、easily removable and access to the high or low side of the main bus is not provided). To perform the test, the bus terminators at each end of the bus network shall be removed, a short applied between the high side of the bus and the shield at one end, and continuity measured between the high side of
48、 the bus and the shield at the opposite end of the bus. If there are direct-coupled connections on the bus network, with a short still applied at one end of the bus network, continuity shall be measured between the high side and the shield for each direct-coupled connection. The maximum resistance m
49、easured for these continuity tests shall be a function of the distance between the measurement point and the short, and shall be less than 0.052 /ft (assumes 26 gage wire or larger). Repeat the test between the low side of the bus and the shield. In addition to the 0.052 /ftCopyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted
