ISO 16844-4:2022
Road vehicles — Tachograph systems — Part 4: Display unit communication interface
This document specifies the CAN-based data communication between the display unit and other devices connected to an SAE J1939-based in-vehicle network. The provided requirements and recommendations cover physical, data link, network, and application layers according to the OSI reference model. Additionally, it specifies the parameter groups, which are supported.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 CAN physical layer requirements
5.1 General
5.2 CAN bit-timing requirements
5.2.1 General
5.2.2 CAN bit-timing requirements for 250 kbit/s
5.2.3 CAN bit-timing requirements for 500 kbit/s
6 CAN data link layer requirements
7 Transport layer requirements
8 Application layer
8.1 General requirements and permissions
8.2 RQST — Request message
8.3 ACKM — Acknowledgement message
8.4 TD — Time/date
8.5 VI — Vehicle identification
8.6 VDHR — High-resolution vehicle distance
8.7 SERV — Service information
8.8 RESET — Reset
8.9 TCO1 — Tachograph
8.10 DI — Driver's identification
8.11 TDA — Time/date adjust
8.12 EEC1 — Electronic engine controller 1
9 Optional parameter groups
9.1 CL — Cab illumination message
9.2 Driving and rest times driver 1/2 – DRTD1/2
9.2.1 DRTD1 — Driver 1 driving rest times
9.2.2 DRTD2 — Driver 2 driving rest times
10 Recommended source address (SA) assignments
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 CAN physical layer requirements
5.1 General
5.2 CAN bit-timing requirements
5.2.1 General
5.2.2 CAN bit-timing requirements for 250 kbit/s
5.2.3 CAN bit-timing requirements for 500 kbit/s
6 CAN data link layer requirements
7 Transport layer requirements
8 Application layer
8.1 General requirements and permissions
8.2 RQST — Request message
8.3 ACKM — Acknowledgement message
8.4 TD — Time/date
8.5 VI — Vehicle identification
8.6 VDHR — High-resolution vehicle distance
8.7 SERV — Service information
8.8 RESET — Reset
8.9 TCO1 — Tachograph
8.10 DI — Driver's identification
8.11 TDA — Time/date adjust
8.12 EEC1 — Electronic engine controller 1
9 Optional parameter groups
9.1 CL — Cab illumination message
9.2 Driving and rest times driver 1/2 – DRTD1/2
9.2.1 DRTD1 — Driver 1 driving rest times
9.2.2 DRTD2 — Driver 2 driving rest times
10 Recommended source address (SA) assignments
Bibliography