ISO 11992-3:2021
(Main)Road vehicles - Interchange of digital information on electrical connections between towing and towed vehicles - Part 3: Application layer for equipment other than brakes and running gear
Road vehicles - Interchange of digital information on electrical connections between towing and towed vehicles - Part 3: Application layer for equipment other than brakes and running gear
This document specifies the application layer, the payload of messages, and parameter groups for equipment other than brakes and running gears, to ensure the interchange of digital information between road vehicles with a maximum authorized total mass greater than 3 500 kg and their towed vehicles, including communication between towed vehicles. This document supports the parameters and message sets for object detection (OD). The installation of the object detection (OD) device compliant to this document in the towed vehicle is identified by a dedicated message. Additionally, some lighting parameters and messages are specified. The conformance and interoperability test plans are not part of this document.
Véhicules routiers — Échange d'informations numériques sur les connexions électriques entre véhicules tracteurs et véhicules tractés — Partie 3: Couche d'application pour les équipements autres que les équipements de freinage et les organes de roulement
General Information
- Status
- Published
- Publication Date
- 20-May-2021
- Technical Committee
- ISO/TC 22/SC 31 - Data communication
- Drafting Committee
- ISO/TC 22/SC 31/WG 4 - Network applications
- Current Stage
- 6060 - International Standard published
- Start Date
- 21-May-2021
- Due Date
- 18-Oct-2020
- Completion Date
- 21-May-2021
Relations
- Effective Date
- 23-Apr-2020
- Effective Date
- 23-Apr-2020
Overview
ISO 11992-3:2021 specifies the application layer for digital communication across electrical connections between towing and towed vehicles (vehicles > 3 500 kg). It defines the payload of messages, parameter groups, and message sets for equipment other than brakes and running gear, enabling standardized interchange of data between tractor units, trailers and between towed vehicles. The standard also supports object detection (OD) parameters and identifies OD device installation via a dedicated message. Note: conformance and interoperability test plans are not included in this document.
Keywords: ISO 11992-3:2021, application layer, towing and towed vehicles, vehicle-to-trailer communication, object detection (OD), electrical connections.
Key topics and technical requirements
- Application layer definitions: message payload structure and parameter coding to ensure consistent interpretation across vehicle systems.
- Parameter groups: a wide set of parameters for non-braking equipment, including (examples taken from the document):
- Rear obstacle distance and object detection device (ODD) messages
- Thermal body temperature and ambient sensors
- Lighting controls and state (stop lights, direction indicators, rear/reversing lights, marker lights, convoy/black-out selections)
- Power take-off (PTO) control and feedback, starter and engine control switches
- Engine and transmission-related parameters (speed, torque requests, gear state, percent clutch slip)
- Status and identification parameters (ODM version, identification data index/content, OD status indicator)
- OD support: message sets and parameters for object detection functions and a dedicated message to indicate OD device installation in the towed vehicle.
- Payload semantics: clear definitions for units, value ranges and confidence levels (e.g., velocity/yaw rate confidence) to support interoperable implementations.
- Scope limitations: does not cover brakes/running gear application details and excludes conformance/interoperability test plans.
Practical applications
- Enables reliable vehicle-to-trailer communication for heavy commercial vehicles, trailers, and towed equipment.
- Supports integration of object detection systems on trailers (rear obstacle sensing, ADAS-type features) and exchange of OD status with the towing vehicle.
- Standardizes trailer lighting controls and special modes (convoy, black‑out) across manufacturers.
- Provides common parameter definitions for telematics, fleet management, safety systems, and ECU integration between tractor and trailer.
Who should use this standard
- Automotive OEMs and trailer manufacturers implementing electrical/electronic interfaces.
- ECU and telematics suppliers building towing–towed communication solutions.
- System integrators, vehicle system architects and fleet telematics vendors.
- Regulators and standards committees referencing consistent in‑vehicle data exchange for heavy vehicles.
Related standards
- Other parts of the ISO 11992 series (covering lower layers and complementary message sets) and vehicle electrical interface standards. Use ISO 11992-3 in conjunction with the series’ physical and transport-layer specifications to achieve full end‑to‑end interoperability.
Frequently Asked Questions
ISO 11992-3:2021 is a standard published by the International Organization for Standardization (ISO). Its full title is "Road vehicles - Interchange of digital information on electrical connections between towing and towed vehicles - Part 3: Application layer for equipment other than brakes and running gear". This standard covers: This document specifies the application layer, the payload of messages, and parameter groups for equipment other than brakes and running gears, to ensure the interchange of digital information between road vehicles with a maximum authorized total mass greater than 3 500 kg and their towed vehicles, including communication between towed vehicles. This document supports the parameters and message sets for object detection (OD). The installation of the object detection (OD) device compliant to this document in the towed vehicle is identified by a dedicated message. Additionally, some lighting parameters and messages are specified. The conformance and interoperability test plans are not part of this document.
This document specifies the application layer, the payload of messages, and parameter groups for equipment other than brakes and running gears, to ensure the interchange of digital information between road vehicles with a maximum authorized total mass greater than 3 500 kg and their towed vehicles, including communication between towed vehicles. This document supports the parameters and message sets for object detection (OD). The installation of the object detection (OD) device compliant to this document in the towed vehicle is identified by a dedicated message. Additionally, some lighting parameters and messages are specified. The conformance and interoperability test plans are not part of this document.
ISO 11992-3:2021 is classified under the following ICS (International Classification for Standards) categories: 43.040.15 - Car informatics. On board computer systems. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 11992-3:2021 has the following relationships with other standards: It is inter standard links to ISO 11992-3:2003/Amd 1:2008, ISO 11992-3:2003. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase ISO 11992-3:2021 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of ISO standards.
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 11992-3
Third edition
2021-05
Road vehicles — Interchange of digital
information on electrical connections
between towing and towed vehicles —
Part 3:
Application layer for equipment other
than brakes and running gear
Véhicules routiers — Échange d'informations numériques sur
les connexions électriques entre véhicules tracteurs et véhicules
tractés —
Partie 3: Couche d'application pour les équipements autres que les
équipements de freinage et les organes de roulement
Reference number
©
ISO 2021
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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below or ISO’s member body in the country of the requester.
ISO copyright office
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Email: copyright@iso.org
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Published in Switzerland
ii © ISO 2021 – All rights reserved
Contents Page
Foreword .ix
Introduction .x
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 2
5 APP – Parameter specification . 3
5.1 General definitions . 3
5.2 Rear obstacle distance . 3
5.3 Thermal body temperature . 4
5.4 Obstacle detection device (ODD) request . 4
5.5 Anti-theft device – Status request . 4
5.6 Obstacle detection device (ODD) active . 5
5.7 Anti-theft device – Measured . 5
5.8 Vehicle type . 5
5.9 Detailed vehicle type . 6
5.10 Percent clutch slip . 6
5.11 Current gear . 7
5.12 Accelerator pedal low idle switch . 7
5.13 Engine propulsion system control allowed . 7
5.14 PTO control allowed . 8
5.15 Tachograph vehicle speed . 8
5.16 Engine propulsion system speed measured . 8
5.17 Driver’s demand engine propulsion system – Percent torque . 8
5.18 Actual engine propulsion system – Percent torque . 9
5.19 Transmission reference torque . 9
5.20 Engine propulsion system percent load at current speed . 9
5.21 Maximum vehicle speed limit . 9
5.22 Engine propulsion system speed upper limit . 9
5.23 Engine propulsion system speed lower limit .10
5.24 Engine propulsion system coolant temperature warning .10
5.25 Engine propulsion system oil pressure warning .10
5.26 Engine propulsion system oil temperature .11
5.27 Engine propulsion system coolant temperature .11
5.28 Engine propulsion system oil pressure .11
5.29 Torque converter oil temperature warning .11
5.30 Torque converter oil temperature .12
5.31 First clutch-dependent PTO feedback .12
5.32 Second clutch-dependent PTO feedback .12
5.33 Clutch-independent PTO feedback .13
5.34 First engine propulsion system-mounted PTO feedback .13
5.35 Second engine propulsion system-mounted PTO feedback .13
5.36 Starter active .14
5.37 Engine propulsion system running .14
5.38 Engine propulsion system torque mode .14
5.39 First clutch-dependent PTO switch .14
5.40 Second clutch-dependent PTO switch .15
5.41 Clutch-independent PTO switch .15
5.42 First engine propulsion system-mounted PTO switch .15
5.43 Second engine propulsion system-mounted PTO switch .16
5.44 Requested percent clutch slip .16
5.45 Starter lockout switch .16
5.46 Engine propulsion system start switch .16
5.47 Engine propulsion system stop switch.17
5.48 Requested engine propulsion system speed upper limit .17
5.49 Requested engine propulsion system speed lower limit .17
5.50 Requested engine propulsion system torque limit .18
5.51 Requested vehicle speed limit .18
5.52 Refuse packer step switch .18
5.53 Operating panel active .19
5.54 Requested engine propulsion system speed .19
5.55 Accelerator pedal position .19
5.56 Ambient air temperature .20
5.57 Fuel level warning .20
5.58 Towed vehicle left-hand stop light(s) .20
5.59 Towed vehicle right-hand stop light(s) .20
5.60 Towed vehicle left-hand direction indicator light(s) .21
5.61 Towed vehicle right-hand direction indicator light(s) .21
5.62 Towed vehicle left-hand rear light(s) .21
5.63 Towed vehicle right-hand rear position light(s) .21
5.64 Towed vehicle left-hand rear fog light(s) .22
5.65 Towed vehicle right-hand rear fog light(s) .22
5.66 Towed vehicle left-hand reversing light(s) .22
5.67 Towed vehicle right-hand reversing light(s) .23
5.68 Towed vehicle left-hand side marker light(s) .23
5.69 Towed vehicle right-hand side marker light(s) .23
5.70 Towed vehicle left-hand rear width indicator light(s) .24
5.71 Towed vehicle right-hand rear width indicator light(s) .24
5.72 Towed vehicle left-hand corner marker light(s) .24
5.73 Towed vehicle right-hand corner marker light(s) .24
5.74 Towed vehicle left-hand rear registration-plate light(s) .25
5.75 Towed vehicle right-hand rear registration-plate light(s) .25
5.76 Towed vehicle rear warning light(s) .25
5.77 Towed vehicle rotating identification light(s) .26
5.78 Towed vehicle interior light(s) .26
5.79 Towed vehicle work light(s) .26
5.80 Body fluid level.27
5.81 Actual pressure .27
5.82 Towed vehicle rear black-out marker select light(s) .27
5.83 Towed vehicle front black-out marker lamp select .27
5.84 Towed vehicle convoy lamp select .28
5.85 Towed vehicle convoy driving lamp select .28
5.86 Towed vehicle black-out brake/stop lamp select .28
5.87 Towed vehicle night vision illuminator select .28
5.88 Towed vehicle black-out work lamp select .28
5.89 Towed vehicle operators black-out intensity selection.29
5.90 Towed vehicle left hand black-out rear light(s) .29
5.91 Towed vehicle right-hand black-out rear light(s) .29
5.92 Towed vehicle left-hand black-out brake/stop light(s) .30
5.93 Towed vehicle right-hand black-out brake/stop light(s) .30
5.94 Towed vehicle rear convoy light(s) .30
5.95 ODM version information .30
5.96 Identification data index .31
5.97 Identification data content .31
5.98 Velocity and yaw rate confidence level .31
5.99 OD status indicator .32
5.100 Cyclic redundancy check (CRC8) .32
5.101 Sequence counter .33
5.102 Longitudinal speed .34
5.103 Lateral speed.34
iv © ISO 2021 – All rights reserved
5.104 Yaw rate .34
5.105 Articulation angle .35
5.106 OD longitudinal distance object .37
5.107 OD lateral distance object .37
5.108 OD absolute longitudinal speed object.38
5.109 OD absolute lateral speed object .38
5.110 OD standard deviation of longitudinal and lateral distance .39
5.111 OD normal deviation of longitudinal and lateral speed .39
5.112 Track ID .40
5.113 Lane curve coefficients .40
5.114 Lane curve validity interval .42
5.115 Lane marker width .42
5.116 Standard deviation of lane information error .43
5.117 Lane marker type .43
5.118 Object width (dimension in lateral direction) .44
5.119 Object length (dimension in longitudinal direction) .44
5.120 Object classification .44
5.121 Geometric distance .45
5.122 Towed vehicle rear IR-black-out marker select .50
5.123 Towed vehicle IR-black-out stop lamp select .51
5.124 Towed vehicle IR-convoy light (‘Leitkreuz’) select .51
5.125 Towed vehicle right-hand IR-black-out rear light(s) .51
5.126 Towed vehicle left-hand IR-black-out rear light(s) .51
5.127 Towed vehicle right-hand IR-black-out stop light(s) .52
5.128 Towed vehicle left-hand IR-black-out stop light(s) .52
5.129 Towed vehicle IR-convoy light (‘Leitkreuz’) .52
5.130 Towed vehicle black-out work lamp(s) .53
5.131 Seconds .53
5.132 Minutes .53
5.133 Hours .54
5.134 Day .54
5.135 Month .54
5.136 Year.55
5.137 Local minute offset .55
5.138 Local hour offset .55
5.139 Trailer left-hand stop light(s) .56
5.140 Trailer right-hand stop light(s) .56
5.141 Trailer left-hand direction indicator light(s) .56
5.142 Trailer right-hand direction indicator light(s) .57
5.143 Trailer left-hand rear light(s) .57
5.144 Trailer right-hand rear light(s) .57
5.145 Trailer left-hand rear fog light(s) .58
5.146 Trailer right-hand rear fog light(s) .58
5.147 Trailer left-hand reversing light(s) .58
5.148 Trailer right-hand reversing light(s) .58
5.149 Trailer left-hand side marker light(s) .59
5.150 Trailer right-hand side marker light(s) .59
5.151 Trailer left-hand rear width indicator light(s).59
5.152 Trailer right-hand rear width indicator light(s).60
5.153 Trailer left-hand corner marker light(s) .60
5.154 Trailer right-hand corner marker light(s) .60
5.155 Trailer left-hand rear registration-plate light(s) .61
5.156 Trailer right-hand rear registration-plate light(s) .61
5.157 Trailer rear warning light(s) .61
5.158 Trailer rotating identification light(s) .61
5.159 Trailer interior light(s) .62
5.160 Trailer work light(s) .62
5.161 Trailer left-hand stop light(s) redundancy function.62
5.162 Trailer right-hand stop light(s) redundancy function . .63
5.163 Trailer left-hand direction indicator light(s) redundancy function .63
5.164 Trailer right-hand direction indicator light(s) redundancy function .63
5.165 Trailer left-hand rear light(s) redundancy function .64
5.166 Trailer right-hand rear light(s) redundancy function .64
5.167 Trailer left-hand reversing light(s) redundancy function .64
5.168 Trailer right-hand reversing light(s) redundancy function .65
5.169 Transmission output shaft PTO feedback .65
5.170 Transfer case output shaft PTO feedback .65
5.171 At least one PTO engaged .66
5.172 Transmission output shaft PTO switch .66
5.173 Transfer case output shaft PTO switch .66
5.174 First clutch-dependent PTO engagement consent .67
5.175 Second clutch-dependent PTO engagement consent .67
5.176 Clutch-independent PTO engagement consent .67
5.177 First engine propulsion system mounted PTO engagement consent .68
5.178 Second engine propulsion system mounted PTO engagement consent .68
5.179 Transmission output shaft PTO engagement consent .68
5.180 Transfer case output shaft PTO engagement consent .69
5.181 First clutch-dependent PTO engagement consent – Trailer .69
5.182 Second clutch-dependent PTO engagement consent – Trailer .69
5.183 Clutch-independent PTO engagement consent – Trailer .70
5.184 First engine propulsion system mounted PTO engagement consent – Trailer .70
5.185 Second engine propulsion system mounted PTO engagement consent – Trailer .70
5.186 Transmission output shaft PTO engagement consent – Trailer .71
5.187 Transfer case output shaft PTO engagement consent – Trailer .71
5.188 Cargo hold temperature 1 .71
5.189 Cargo hold temperature 2 .72
5.190 Cargo hold temperature 3 .72
5.191 Cargo hold temperature 4 .72
5.192 Cargo hold temperature 5 .73
5.193 Cargo hold temperature 6 .73
5.194 Reefer unit battery voltage .73
5.195 Reefer unit fuel tank level .74
5.196 Requested evaporator 1 set-point .74
5.197 Requested evaporator 2 set-point .74
5.198 Requested evaporator 3 set-point .75
5.199 Evaporator 1 set-point .75
5.200 Evaporator 2 set-point .75
5.201 Evaporator 3 set-point .76
5.202 Compartment 1 humidity .76
5.203 Compartment 2 humidity .76
5.204 Compartment 3 humidity .77
5.205 Compartment 1 oxygen concentration .77
5.206 Compartment 2 oxygen concentration .77
5.207 Compartment 3 oxygen concentration .78
5.208 Reefer unit alarm status .78
5.209 Status evaporator 1 .78
5.210 Status evaporator 2 .79
5.211 Status evaporator 3 .79
5.212 Reefer unit status .79
5.213 Reefer unit start/stop operating hours .80
5.214 Reefer unit diesel engine propulsion system operating hours .80
5.215 Reefer unit line supply operating hours .80
5.216 Reefer unit generator operating hours .81
5.217 Reefer unit on/off .81
5.218 Reefer unit defrost cycle on/off .81
5.219 Cargo hold door 1 contact switch .81
vi © ISO 2021 – All rights reserved
5.220 Cargo hold door 2 contact switch .82
5.221 Cargo hold door 3 contact switch .82
6 PG specification .82
6.1 Towing vehicle .82
6.1.1 General requirements .82
6.1.2 Overview of towing vehicle PGs.83
6.1.3 CANopen messages .84
6.1.4 General purpose message #1/1 (GPM11) .85
6.1.5 General purpose message #1/2 (GPM12) .85
6.1.6 General purpose message #1/3 (GPM13) .86
6.1.7 General purpose message #1/4 (GPM14) .86
6.1.8 General purpose message #1/5 (GPM15) .87
6.1.9 General purpose message #1/6 (GPM16) .88
6.1.10 General purpose message #1/7 (GPM17) .88
6.1.11 General purpose message #1/8 (GPM18) .89
6.1.12 General purpose message #1/9 (GPM19) .90
6.1.13 Military application message #1/1 (MAM11) .90
6.1.14 Time/Date message #1/1 (TD11) .91
6.1.15 Object detection message #1/1 (ODM11) .91
6.2 Towed vehicle . .92
6.2.1 General requirements .92
6.2.2 Overview of towed vehicle messages .93
6.2.3 General purpose message #2/1 (GPM21) .94
6.2.4 General purpose message #2/2 (GPM22) .94
6.2.5 General purpose message #2/3 (GPM23) .95
6.2.6 General purpose me
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ISO 11992-3:2021은 도로 차량 간의 전기 연결로부터의 디지털 정보 교환을 위한 응용 계층, 메시지 페이로드 및 브레이크 및 주행 장치 외의 장비를위한 매개 변수 그룹을 명시한다. 이 문서는 최대 인가 총 질량이 3,500 kg 이상인 도로 차량과 그에 대한 견인 차량 간의 디지털 정보 교환을 보장하며, 견인 차량 간의 통신도 포함한다. 이 문서는 객체 감지 (OD)에 대한 매개 변수와 메시지 세트를 지원한다. 이 문서에 따라 견인 차량에 설치된 객체 감지 (OD) 장치는 전용 메시지에 의해 식별된다. 또한, 일부 조명 매개 변수와 메시지도 명시된다. 이 문서에는 일치성 및 상호 운용성 테스트 계획이 포함되어 있지 않다.
ISO 11992-3:2021 is a standard that specifies the application layer, message payload, and parameter groups for equipment other than brakes and running gears in road vehicles. It aims to ensure the digital interchange of information between towing and towed vehicles with a total mass over 3,500 kg. The standard also includes communication between towed vehicles and supports object detection (OD) parameters and message sets. It identifies the installation of an OD device in the towed vehicle through a dedicated message. Additionally, the standard outlines lighting parameters and messages. Conformance and interoperability test plans are not included in this document.
ISO 11992-3:2021は、トレーラーと牽引車両間の電気接続におけるデジタル情報の交換を保証するため、ブレーキや走行装置以外の装備に関するアプリケーション層、メッセージのペイロード、パラメーターグループを規定しています。この規格は、総重量が3,500 kgを超える道路車両と牽引される車両の間のデジタル情報の交換をサポートし、牽引される車両間の通信も含まれます。また、この規格は、オブジェクト検知（OD）のパラメーターとメッセージセットをサポートしています。牽引される車両にこの規格に準拠したODデバイスを取り付けることは、専用のメッセージによって識別されます。さらに、一部の照明パラメーターとメッセージも指定されています。この文書には、適合性と相互運用性のテスト計画は含まれていません。
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