ISO 11992-2:2023
Road vehicles — Interchange of digital information on electrical connections between towing and towed vehicles — Part 2: Application layer for brakes and running gear
This document specifies the SAE J1939-based application layer, the payload of messages, and parameter groups for electronically controlled braking systems, including anti-lock braking systems (ABS), vehicle dynamics control systems (VDC), and running gears equipment, 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.
Conformance and interoperability test plans are not part of this document.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
4.1 Symbols
4.2 Abbreviated terms
5 Conventions
6 APP – Parameter specification
6.1 General definitions
6.2 APP – Identification parameter specification
6.2.1 APP – Axle/wheel identification
6.2.2 APP – Identification data index
6.2.3 APP – Identification data indexed content
6.3 APP – Braking systems parameter specification
6.3.1 APP – Park brake demand relative pressure
6.3.2 APP – Service brake demand pressure
6.3.3 APP – Vehicle service brake status
6.3.4 APP – Braking system wheel-based vehicle speed
6.3.5 APP – Vehicle retarder control status
6.3.6 APP – Retarder demand relative torque
6.3.7 APP – Retarder wheel torque reference
6.3.8 APP – Retarder relative peak torque
6.3.9 APP – Retarder actual maximum positive torque
6.3.10 APP – Retarder actual maximum negative torque
6.3.11 APP – Axle load sum
6.3.12 APP – Pneumatic supply pressure
6.3.13 APP – Brake lining
6.3.14 APP – Brake temperature
6.3.15 APP – Tyre pressure
6.3.16 APP – Automatic towed vehicle braking status
6.3.17 APP – Vehicle ABS status
6.3.18 APP – Vehicle electrical supply status
6.3.19 APP – Vehicle pneumatic supply status
6.3.20 APP – Spring brake installation status
6.3.21 APP – Electrical load proportional function installation status
6.3.22 APP – Load proportional function installation status
6.3.23 APP – ABS off-road request
6.3.24 APP – ASR brake control status
6.3.25 APP – ASR engine control status
6.3.26 APP – Pneumatic control line status
6.3.27 APP – Two electrical circuits brake demand status
6.3.28 APP – Tyre pressure status
6.3.29 APP – Brake lining status
6.3.30 APP – Brake temperature status
6.3.31 APP – Brake light switch
6.3.32 APP – Vehicle type
6.3.33 APP – Red warning signal request
6.3.34 APP – Amber warning signal request
6.3.35 APP – Electrical supply of non-braking systems status
6.3.36 APP – Loading ramp approach assistance status
6.3.37 APP – VDC active
6.3.38 APP – Road curvature
6.3.39 APP – Wheel speed difference main axle
6.3.40 APP – Supply line braking
6.3.41 APP – Spring brake status
6.3.42 APP – Relative brake demand for front or left vehicle side
6.3.43 APP – Relative brake demand for rear or right vehicle side
6.3.44 APP – Support of side- or axle-wise brake force distribution
6.3.45 APP – Lateral acceleration
6.3.46 APP – Stop lamps request
6.3.47 APP – Braking via electric control line support
6.3.48 APP – Geometric data index
6.3.49 APP – Geometric data indexed content
6.3.50 APP – Brake cylinder pressure first axle, left wheel
6.3.51 APP – Brake cylinder pressure first axle, right wheel
6.3.52 APP – Brake cylinder pressure second axle, left wheel
6.3.53 APP – Brake cylinder pressure second axle, right wheel
6.3.54 APP – Brake cylinder pressure third axle, left wheel
6.3.55 APP – Brake cylinder pressure third axle, right wheel
6.3.56 APP – Wheel speed first axle, left wheel
6.3.57 APP – Wheel speed first axle, right wheel
6.3.58 APP – ROP system status
6.3.59 APP – YC system status
6.3.60 APP – Towed vehicle ROP system request
6.3.61 APP – Towed vehicle YC system request
6.3.62 APP – Vehicle combination ABS status
6.3.63 APP – Towed vehicle detection status
6.3.64 APP – Reverse gear status
6.3.65 APP – External brake request status
6.3.66 APP – Emergency braking status
6.4 APP – Running gear equipment parameter specification
6.4.1 APP – Driven axle load
6.4.2 APP – Nominal vehicle body level, front axle
6.4.3 APP – Nominal vehicle body level, rear axle
6.4.4 APP – Relative vehicle body level, front axle
6.4.5 APP – Relative vehicle body level, rear axle
6.4.6 APP – Level control request
6.4.7 APP – Level control status
6.4.8 APP – Level change request, front axle
6.4.9 APP – Level change request, rear axle
6.4.10 APP – Level change status, front axle
6.4.11 APP – Level change status, rear axle
6.4.12 APP – Lift axle 1 position request
6.4.13 APP – Lift axle 2 position request
6.4.14 APP – Lift axle 3 position request
6.4.15 APP – Lift axle 4 position request
6.4.16 APP – Lift axle 5 position request
6.4.17 APP – Lift axle 1 position
6.4.18 APP – Lift axle 2 position
6.4.19 APP – Lift axle 3 position
6.4.20 APP – Lift axle 4 position
6.4.21 APP – Lift axle 5 position
6.4.22 APP – Steering axle locking request
6.4.23 APP – Steering axle locking status
6.4.24 APP – Traction help (load transfer) request
6.4.25 APP – Traction help (load transfer) status
6.4.26 APP – Ride height request
6.4.27 APP – Ride height level
6.4.28 APP – Normal level
6.4.29 APP – Ramp level request
6.4.30 APP – Ramp level
6.4.31 APP – Ramp level position
6.4.32 APP – Ramp level storage request
6.4.33 APP – Ramp level storage status
6.4.34 APP – Stop level change request
6.4.35 APP – Stop level change request acknowledge
6.4.36 APP – Parking and towed vehicle air pressure
6.4.37 APP – Auxiliary equipment supply pressure
6.4.38 APP – Tyre pressure threshold detection
6.4.39 APP – Air leakage detection
6.4.40 APP – Tyre temperature
6.4.41 APP – Tyre module power supply status
6.5 APP – Axle load parameter specification
6.5.1 APP – Axle load
6.5.2 APP – Axle load calibration data storage request
6.5.3 APP – Axle load calibration data storage status
6.5.4 APP – Axle load measured by external scale
6.5.5 APP – Axle load measured by towed vehicle
6.5.6 APP – Axle load calibration data load level
6.5.7 APP – Axle load calibration type
6.5.8 APP – Maximum driven axle load
6.6 Ride height parameter specification
6.6.1 APP – Extended ride height and ramp level storage
6.6.2 APP – Ride height and ramp level set request
6.6.3 APP – Ride height storage request
6.6.4 APP – Ride height storage
6.6.5 APP – Neutral gear request
6.6.6 APP – Rear obstacle distance
6.6.7 APP – Immobilizer status
6.6.8 APP – Fifth wheel load
6.6.9 APP – Ambient air temperature
6.6.10 APP – Parking brake status
6.6.11 APP – Neutral gear status
6.7 APP – Software update parameter specification
6.7.1 APP – Vehicle software update request
6.7.2 APP – Vehicle software update request acknowledgement
7 APP – PG specification
7.1 APP – Overview of PGs
7.2 APP – Message transmission in case of multiple towed vehicles
7.3 APP – Towing vehicle
7.3.1 APP – General specification
7.3.2 APP – General PGs, transmitted from the towing to the towed vehicle
7.3.3 APP – Electronic brake system PGs, transmitted from the towing to the towed vehicle
7.3.4 APP – Running gear equipment PGs, transmitted from the towing to the towed vehicle
7.4 APP – Towed vehicle
7.4.1 APP – General PGs, transmitted from the towed to the towing vehicle
7.4.2 APP – Electronic brake system PGs, transmitted from the towed to the towing vehicle
7.4.3 APP – Running gear equipment PGs, transmitted from towed to towing vehicle
8 APP – Address assignment
8.1 APP – General requirements
8.2 APP – Road train configuration
8.3 APP – Address assignment method of a towing and towed vehicle
8.4 APP – Vehicle node capabilities
9 SI – Service interface definition between application and OSI layers
9.1 SI – A_Data.req, A_Data.ind, and A_Data.con service interface
9.2 SI – A_Data.req, A_Data.ind, and A_Data.con service interface parameter mapping
9.3 SIP – Service interface data type definitions
10 AL – Application layer
10.1 AL – Message PDU format
10.2 AL – A_PDU specification
11 PL – Presentation layer
Annex A (normative) Geometric dimensions
Annex B (normative) Software update request and acknowledge interaction between towing and towed vehicles
Annex C (informative) Message flow
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
4.1 Symbols
4.2 Abbreviated terms
5 Conventions
6 APP – Parameter specification
6.1 General definitions
6.2 APP – Identification parameter specification
6.2.1 APP – Axle/wheel identification
6.2.2 APP – Identification data index
6.2.3 APP – Identification data indexed content
6.3 APP – Braking systems parameter specification
6.3.1 APP – Park brake demand relative pressure
6.3.2 APP – Service brake demand pressure
6.3.3 APP – Vehicle service brake status
6.3.4 APP – Braking system wheel-based vehicle speed
6.3.5 APP – Vehicle retarder control status
6.3.6 APP – Retarder demand relative torque
6.3.7 APP – Retarder wheel torque reference
6.3.8 APP – Retarder relative peak torque
6.3.9 APP – Retarder actual maximum positive torque
6.3.10 APP – Retarder actual maximum negative torque
6.3.11 APP – Axle load sum
6.3.12 APP – Pneumatic supply pressure
6.3.13 APP – Brake lining
6.3.14 APP – Brake temperature
6.3.15 APP – Tyre pressure
6.3.16 APP – Automatic towed vehicle braking status
6.3.17 APP – Vehicle ABS status
6.3.18 APP – Vehicle electrical supply status
6.3.19 APP – Vehicle pneumatic supply status
6.3.20 APP – Spring brake installation status
6.3.21 APP – Electrical load proportional function installation status
6.3.22 APP – Load proportional function installation status
6.3.23 APP – ABS off-road request
6.3.24 APP – ASR brake control status
6.3.25 APP – ASR engine control status
6.3.26 APP – Pneumatic control line status
6.3.27 APP – Two electrical circuits brake demand status
6.3.28 APP – Tyre pressure status
6.3.29 APP – Brake lining status
6.3.30 APP – Brake temperature status
6.3.31 APP – Brake light switch
6.3.32 APP – Vehicle type
6.3.33 APP – Red warning signal request
6.3.34 APP – Amber warning signal request
6.3.35 APP – Electrical supply of non-braking systems status
6.3.36 APP – Loading ramp approach assistance status
6.3.37 APP – VDC active
6.3.38 APP – Road curvature
6.3.39 APP – Wheel speed difference main axle
6.3.40 APP – Supply line braking
6.3.41 APP – Spring brake status
6.3.42 APP – Relative brake demand for front or left vehicle side
6.3.43 APP – Relative brake demand for rear or right vehicle side
6.3.44 APP – Support of side- or axle-wise brake force distribution
6.3.45 APP – Lateral acceleration
6.3.46 APP – Stop lamps request
6.3.47 APP – Braking via electric control line support
6.3.48 APP – Geometric data index
6.3.49 APP – Geometric data indexed content
6.3.50 APP – Brake cylinder pressure first axle, left wheel
6.3.51 APP – Brake cylinder pressure first axle, right wheel
6.3.52 APP – Brake cylinder pressure second axle, left wheel
6.3.53 APP – Brake cylinder pressure second axle, right wheel
6.3.54 APP – Brake cylinder pressure third axle, left wheel
6.3.55 APP – Brake cylinder pressure third axle, right wheel
6.3.56 APP – Wheel speed first axle, left wheel
6.3.57 APP – Wheel speed first axle, right wheel
6.3.58 APP – ROP system status
6.3.59 APP – YC system status
6.3.60 APP – Towed vehicle ROP system request
6.3.61 APP – Towed vehicle YC system request
6.3.62 APP – Vehicle combination ABS status
6.3.63 APP – Towed vehicle detection status
6.3.64 APP – Reverse gear status
6.3.65 APP – External brake request status
6.3.66 APP – Emergency braking status
6.4 APP – Running gear equipment parameter specification
6.4.1 APP – Driven axle load
6.4.2 APP – Nominal vehicle body level, front axle
6.4.3 APP – Nominal vehicle body level, rear axle
6.4.4 APP – Relative vehicle body level, front axle
6.4.5 APP – Relative vehicle body level, rear axle
6.4.6 APP – Level control request
6.4.7 APP – Level control status
6.4.8 APP – Level change request, front axle
6.4.9 APP – Level change request, rear axle
6.4.10 APP – Level change status, front axle
6.4.11 APP – Level change status, rear axle
6.4.12 APP – Lift axle 1 position request
6.4.13 APP – Lift axle 2 position request
6.4.14 APP – Lift axle 3 position request
6.4.15 APP – Lift axle 4 position request
6.4.16 APP – Lift axle 5 position request
6.4.17 APP – Lift axle 1 position
6.4.18 APP – Lift axle 2 position
6.4.19 APP – Lift axle 3 position
6.4.20 APP – Lift axle 4 position
6.4.21 APP – Lift axle 5 position
6.4.22 APP – Steering axle locking request
6.4.23 APP – Steering axle locking status
6.4.24 APP – Traction help (load transfer) request
6.4.25 APP – Traction help (load transfer) status
6.4.26 APP – Ride height request
6.4.27 APP – Ride height level
6.4.28 APP – Normal level
6.4.29 APP – Ramp level request
6.4.30 APP – Ramp level
6.4.31 APP – Ramp level position
6.4.32 APP – Ramp level storage request
6.4.33 APP – Ramp level storage status
6.4.34 APP – Stop level change request
6.4.35 APP – Stop level change request acknowledge
6.4.36 APP – Parking and towed vehicle air pressure
6.4.37 APP – Auxiliary equipment supply pressure
6.4.38 APP – Tyre pressure threshold detection
6.4.39 APP – Air leakage detection
6.4.40 APP – Tyre temperature
6.4.41 APP – Tyre module power supply status
6.5 APP – Axle load parameter specification
6.5.1 APP – Axle load
6.5.2 APP – Axle load calibration data storage request
6.5.3 APP – Axle load calibration data storage status
6.5.4 APP – Axle load measured by external scale
6.5.5 APP – Axle load measured by towed vehicle
6.5.6 APP – Axle load calibration data load level
6.5.7 APP – Axle load calibration type
6.5.8 APP – Maximum driven axle load
6.6 Ride height parameter specification
6.6.1 APP – Extended ride height and ramp level storage
6.6.2 APP – Ride height and ramp level set request
6.6.3 APP – Ride height storage request
6.6.4 APP – Ride height storage
6.6.5 APP – Neutral gear request
6.6.6 APP – Rear obstacle distance
6.6.7 APP – Immobilizer status
6.6.8 APP – Fifth wheel load
6.6.9 APP – Ambient air temperature
6.6.10 APP – Parking brake status
6.6.11 APP – Neutral gear status
6.7 APP – Software update parameter specification
6.7.1 APP – Vehicle software update request
6.7.2 APP – Vehicle software update request acknowledgement
7 APP – PG specification
7.1 APP – Overview of PGs
7.2 APP – Message transmission in case of multiple towed vehicles
7.3 APP – Towing vehicle
7.3.1 APP – General specification
7.3.2 APP – General PGs, transmitted from the towing to the towed vehicle
7.3.3 APP – Electronic brake system PGs, transmitted from the towing to the towed vehicle
7.3.4 APP – Running gear equipment PGs, transmitted from the towing to the towed vehicle
7.4 APP – Towed vehicle
7.4.1 APP – General PGs, transmitted from the towed to the towing vehicle
7.4.2 APP – Electronic brake system PGs, transmitted from the towed to the towing vehicle
7.4.3 APP – Running gear equipment PGs, transmitted from towed to towing vehicle
8 APP – Address assignment
8.1 APP – General requirements
8.2 APP – Road train configuration
8.3 APP – Address assignment method of a towing and towed vehicle
8.4 APP – Vehicle node capabilities
9 SI – Service interface definition between application and OSI layers
9.1 SI – A_Data.req, A_Data.ind, and A_Data.con service interface
9.2 SI – A_Data.req, A_Data.ind, and A_Data.con service interface parameter mapping
9.3 SIP – Service interface data type definitions
10 AL – Application layer
10.1 AL – Message PDU format
10.2 AL – A_PDU specification
11 PL – Presentation layer
Annex A (normative) Geometric dimensions
Annex B (normative) Software update request and acknowledge interaction between towing and towed vehicles
Annex C (informative) Message flow
Bibliography