ISO INTERNATIONAL STANDARD 16844-3 Second edition 2022-05 Road vehicles Tachograph systems - Part 3: Motion sensor communication interface vehicules routiers - Systemes tachygraphes - Partie3:Interfacedecommunicationpourcapteurdemouvement Reference number IS0 16844-3:2022(E) ISO @ISO2022 IS016844-3:2022(E) COPYRIGHTPROTECTEDDOCUMENT @ISO2022 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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 the address below or IsO's member body in the country of the requester. ISo copyright office CP401·Ch.deBlandonnet8 CH-1214 Vernier,Geneva Phone: +41 22 749 01 11 Email:[email protected] Website: www.iso.org Published in Switzerland ii @IS0 2022-All rights reserved IS016844-3:2022(E) Contents Page Foreword iv Introduction .V 1 Scope. .1 2 Normativereferences .1 3 Terms and definitions. .1 4 Symbolsandabbreviatedterms. .2 5 Connector. .4 5.1 Dimensions andpin allocation 4 5.2 Electrical specification. 4 5.2.1 Electricalrequirements 4 5.2.2 Block diagram data signal, in/out 5 5.2.3 Voltage monitoring and watchdog signal 6 5.2.4 Block diagram of the speed signal, real-time 7 6 Cable .8 7 Interfaceprotocol 9 7.1 Transmission 9 7.1.1 Bit rate and frame structure 9 7.1.2 Frame specification. 9 7.1.3 State diagram - Communicationandexecutionofinstructions 11 7.2 Motion sensor state attheend of production 12 7.3 .12 Instructions. 7.4 Initialisation of communication between motion sensor and recording equipment 13 7.4.1 General 13 7.4.2 Necessarysequenceofinstructionforpairing 13 7.4.3 Pairing initialisation of recording equipment and motion sensor 14 7.4.4 Transmissionofencryptedserialnumberofmotionsensor 14 7.4.5 Transmission of sessionkey from recording equipment tomotion sensor 15 7.4.6 Transmission of pairing information from recording equipment to motion 15 sensor 7.4.7 Request from recording equipment for pairing information and 16 authenticationtomotionsensor 7.5 Communication of motion sensor and recording equipment in regular use 16 7.5.1 Sequence of instructionfor communication inregular use. 16 7.5.2 Latch of counter value and encrypt data. 17 7.5.3 Transmissionofencrypteddata 18 7.6 Read information.. 19 7.6.1 Necessary sequence of instruction for reading information 19 7.6.2 Request 19 7.6.3 Generalmessage structures 20 7.6.4 Data block chaining 21 7.6.5 Structures of selected data .21 7.6.6 Pairingdata 24 .25 8 Optionalfunctionality 8.1 Additional direction information intheMFbyte 25 Bibliography .26 @ IS0 2022 -All rights reserved iii