ISO 11992-2:2023

INTERNATIONAL ISO
STANDARD 11992-2
Fourth edition
2023-03
Road vehicles — Interchange of digital
information on electrical connections
between towing and towed vehicles —
Part 2:
Application layer for brakes and
running gear
Véhicules routiers — Échange d'informations numériques sur
les connexions électriques entre véhicules tracteurs et véhicules
tractés —
Partie 2: Couche d'application pour les équipements de freinage et les
organes de roulement
Reference number
© ISO 2023
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Published in Switzerland
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Contents Page
Foreword .vii
Introduction .viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms.4
4.1 Symbols . 4
4.2 Abbreviated terms . 4
5 Conventions . 5
6 APP – Parameter specification . 5
6.1 General definitions. 5
6.2 APP – Identification parameter specification . 6
6.2.1 APP – Axle/wheel identification . 6
6.2.2 APP – Identification data index . 8
6.2.3 APP – Identification data indexed content . 9
6.3 APP – Braking systems parameter specification . 10
6.3.1 APP – Park brake demand relative pressure . 10
6.3.2 APP – Service brake demand pressure . 10
6.3.3 APP – Vehicle service brake status . 11
6.3.4 APP – Braking system wheel-based vehicle speed . 11
6.3.5 APP – Vehicle retarder control status . 11
6.3.6 APP – Retarder demand relative torque .12
6.3.7 APP – Retarder wheel torque reference .13
6.3.8 APP – Retarder relative peak torque . 14
6.3.9 APP – Retarder actual maximum positive torque . 14
6.3.10 APP – Retarder actual maximum negative torque . 14
6.3.11 APP – Axle load sum .15
6.3.12 APP – Pneumatic supply pressure . 15
6.3.13 APP – Brake lining . 15
6.3.14 APP – Brake temperature . 16
6.3.15 APP – Tyre pressure . 16
6.3.16 APP – Automatic towed vehicle braking status . 16
6.3.17 APP – Vehicle ABS status . 17
6.3.18 APP – Vehicle electrical supply status . 17
6.3.19 APP – Vehicle pneumatic supply status . 18
6.3.20 APP – Spring brake installation status . 18
6.3.21 APP – Electrical load proportional function installation status . 18
6.3.22 APP – Load proportional function installation status . 19
6.3.23 APP – ABS off-road request . 19
6.3.24 APP – ASR brake control status . 19
6.3.25 APP – ASR engine control status . 20
6.3.26 APP – Pneumatic control line status . 20
6.3.27 APP – Two electrical circuits brake demand status .20
6.3.28 APP – Tyre pressure status . 21
6.3.29 APP – Brake lining status . 21
6.3.30 APP – Brake temperature status . 22
6.3.31 APP – Brake light switch . 22
6.3.32 APP – Vehicle type . 22
6.3.33 APP – Red warning signal request . 23
6.3.34 APP – Amber warning signal request . 23
6.3.35 APP – Electrical supply of non-braking systems status .23
6.3.36 APP – Loading ramp approach assistance status . . 24
iii
6.3.37 APP – VDC active . 24
6.3.38 APP – Road curvature . 25
6.3.39 APP – Wheel speed difference main axle . 25
6.3.40 APP – Supply line braking . 25
6.3.41 APP – Spring brake status . 26
6.3.42 APP – Relative brake demand for front or left vehicle side .26
6.3.43 APP – Relative brake demand for rear or right vehicle side . 27
6.3.44 APP – Support of side- or axle-wise brake force distribution . 27
6.3.45 APP – Lateral acceleration . 27
6.3.46 APP – Stop lamps request .28
6.3.47 APP – Braking via electric control line support .28
6.3.48 APP – Geometric data index .28
6.3.49 APP – Geometric data indexed content .29
6.3.50 APP – Brake cylinder pressure first axle, left wheel . 32
6.3.51 APP – Brake cylinder pressure first axle, right wheel . 33
6.3.52 APP – Brake cylinder pressure second axle, left wheel .33
6.3.53 APP – Brake cylinder pressure second axle, right wheel .33
6.3.54 APP – Brake cylinder pressure third axle, left wheel .34
6.3.55 APP – Brake cylinder pressure third axle, right wheel .34
6.3.56 APP – Wheel speed first axle, left wheel . 35
6.3.57 APP – Wheel speed first axle, right wheel . 35
6.3.58 APP – ROP system status . 35
6.3.59 APP – YC system status. 36
6.3.60 APP – Towed vehicle ROP system request .36
6.3.61 APP – Towed vehicle YC system request .36
6.3.62 APP – Vehicle combination ABS status . 37
6.3.63 APP – Towed vehicle detection status . 37
6.3.64 APP – Reverse gear status . .38
6.3.65 APP – External brake request status .38
6.3.66 APP – Emergency braking status .38
6.4 APP – Running gear equipment parameter specification .39
6.4.1 APP – Driven axle load .
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