ISO 11992-2:2003/Amd 1:2007

General Information

Status
Replaced
Publication Date
09-Sep-2007
Withdrawal Date
09-Sep-2007
Technical Committee
Drafting Committee
Current Stage
6060 - International Standard published
Start Date
20-Aug-2007
Completion Date
10-Sep-2007
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INTERNATIONAL ISO
STANDARD 11992-2
Second edition
2003-04-15
AMENDMENT 1
2007-09-15
Road vehicles — Interchange of digital
information on electrical connections
between towing and towed vehicles —
Part 2:
Application layer for brakes and running
gear
AMENDMENT 1
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
AMENDEMENT 1
Reference number
ISO 11992-2:2003/Amd.1:2007(E)
ISO 2007
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ISO 11992-2:2003/Amd.1:2007(E)
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© ISO 2007

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ii © ISO 2007 – All rights reserved
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ISO 11992-2:2003/Amd.1:2007(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies

(ISO member bodies). The work of preparing International Standards is normally carried out through ISO

technical committees. Each member body interested in a subject for which a technical committee has been

established has the right to be represented on that committee. International organizations, governmental and

non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

Amendment 1 to ISO 11992-2:2003 was prepared by Technical Committee ISO/TC 22, Road vehicles,

Subcommittee SC 3, Electrical and electronic equipment.
© ISO 2007 – All rights reserved iii
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ISO 11992-2:2003/Amd.1:2007(E)
Road vehicles — Interchange of digital information on electrical
connections between towing and towed vehicles —
Part 2:
Application layer for brakes and running gear
AMENDMENT 1
Page iv, Foreword, 7th paragraph
Replace the list of parts with the following.
⎯ Part 1: Physical and data-link layers
⎯ Part 2: Application layer for brakes and running gear
⎯ Part 3: Application layer for equipment other than brakes and running gear
⎯ Part 4: Diagnostics
Page 1, Clause 2
Replace the entire list of normative references with the following new list.
ISO 11898 (all parts), Road vehicles — Controller area network (CAN)

ISO 11992-1, Road vehicles — Interchange of digital information on electrical connections between towing

and towed vehicles — Part 1: Physical and data-link layers
Page 5, 6.2, 5th paragraph, 2nd sentence

Delete the following sentence: “To avoid any transmission conflict during the dynamic address assignment

phase (power-up), the PDU 2 type message shall have even PS (GE) in the predecessor transmission

direction and odd PS (GE) in the successor transmission direction.”
Page 8, 6.3, Figure 9
Replace the existing figure with the following new figure.
Figure 9 — Example of PDU 2 type message from towed vehicle #2
© ISO 2007 – All rights reserved 1
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ISO 11992-2:2003/Amd.1:2007(E)
Page 18, 6.4.2.2.33
Add the following note at the end of 6.4.2.2.33.

NOTE The amber warning signal request is regarded as providing the same information as the yellow warning signal,

activated by the trailer on pin 5 of the electric connector conforming to ISO 7638, as specified in UNECE Regulation 13.

Page 19, 6.4.2.2.36
Replace the entire subclause with the following new subclause.
6.4.2.2.36 VDC active

VDC (Vehicle Dynamic Control) means an electronic vehicle stability function which is a function within the

braking system and reacts to stabilise the vehicle during dynamic manoeuvres. VDC includes Roll Over

Prevention (ROP) and/or Yaw Control (YC).

The parameter VDC Active shall only be set to active when a vehicle stability function event occurs where the

intent is to impact on vehicle stability. Interventions by the vehicle stability function in any process designed to

determine the physical characteristics of the vehicle are not considered to be VDC Active events.

NOTE 1 In UNECE Regulation No. 13, Roll Over Prevention is referred to as Roll-Over Control and Yaw Control is

referred to as Directional Control.

NOTE 2 Active does not mean “installed” or “enabled”, but indicates an actual VDC situation.

00 — VDC passive, but installed
01 — VDC active
Type: Measured
Page 19

Insert the following new subclauses immediately after 6.4.2.2.40, including the new Table 7 and the new

Figure 11.
6.4.2.2.41 Relative brake demand value for front or left vehicle side

The requested percentage of the service brake demand value which has to be applied to the steering axle

wheels in case of a drawbar trailer or to the wheels on the left side of the vehicle in case of a semi trailer. This

signal supports the trailer stabilisation in case of a trailer instability by the towing vehicle by means of

requesting a selective brake force distribution.
Data length: 1 byte
Resolution: 0,4 %/bit gain, 0 % offset
Data range: 0 % to 100 %
Type: Status
2 © ISO 2007 – All rights reserved
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ISO 11992-2:2003/Amd.1:2007(E)
6.4.2.2.42 Relative brake demand value for rear or right vehicle side

The requested percentage of the service brake demand value which has to be applied to the wheels of the

rear axle(s) in case of a drawbar trailer or to the wheels on the right side of the vehicle in case of a semi trailer.

This signal supports the trailer stabilisation in case of a trailer instability by the towing vehicle by means of

requesting a selective brake force distribution.
Data length: 1 byte
Resolution: 0,4 %/bit gain, 0 % offset
Data range: 0 % to 100 %
Type: Status
6.4.2.2.43 Support of side or axle wise brake force distribution

Indicates whether the function of an axle wise brake force distribution (in case of a drawbar trailer) or a side

wise brake force distribution (in case of a semi trailer) is enabled.
00 — Side/axle wise brake force distribution disabled
01 — Side/axle wise brake force distribution enabled
Type: Measured
6.4.2.2.44 Lateral acceleration

Indicates a lateral acceleration of the vehicle. A positive lateral acceleration signal results when the vehicle is

accelerated to the left.
Data length: 1 byte
2 2
Resolution: 1/10 m/s /bit gain, −12,5 m/s offset
2 2
Data range: −12,5 m/s to 12,5 m/s
Type: Measured
6.4.2.2.45 Stop lamps request

Request from the towed vehicle to the commercial vehicle to illuminate the stop lamps.

00 — No request to illuminate stop lamps
01 — Request to illuminate stop lamps
Type: Status
6.4.2.2.46 Braking via electric control line supported
Indicates whether the towed vehicle supports braking via the electric control.
00 — Braking via electric control line not supported
01 — Braking via electric control line supported
Type: Measured
© ISO 2007 – All rights reserved 3
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ISO 11992-2:2003/Amd.1:2007(E)
6.4.2.2.47 Geometric data index
Serves as an index counter.
Data length: 1 byte
Resolution: see Table 7
Data range: see Table 7
Type: Measured
6.4.2.2.48 Geometric data indexed content

Geometric data, the content of this parameter depends on the Geometric data index.

Data length: 1 byte
Resolution: see Table 7
Data range: see Table 7
Type: Measured
Table 7 — Geometric data
Geometric data index Geometric data indexed content
0 Type of the towed vehicle
Resolution: 1/bit
Data range: 0 to 250
Type: 0 Semi trailer
1 Centre-axle trailer
2 Drawbar trailer
3 Dolly
4 to 250 Not defined
NOTE Information about “normal trailer” or “dolly” is also available in EBS 22.
1 Length between coupling point and middle of the first axle (see Figure 11)
Resolution: 0,1 m/bit
Data range: 0 m to 25 m
2 Track width (see Figure 11)
Resolution: 10 mm/bit
Data range: 0 mm to 2 500 mm
3 Total number of axles
Resolution: 1/bit
Data range: 0 to 250
4 Number of front axles (only in case of drawbar trailers, i.e. Type = 2)
Resolution: 1/bit
Data range: 0 to 250
4 © ISO 2007 – All rights reserved
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ISO 11992-2:2003/Amd.1:2007(E)
Table 7 (continued)
Geometric data index Geometric data indexed content
5 Number of lift axles
Resolution: 1/bit
Data range: 0 to 250
6 Position (axle number) of lift axle 1
Resolution: 1/bit
Data range: 0 axle position cannot be identified
1 to 250 axle position
7 Position (axle number) of lift axle 2
Resolution: 1/bit
Data range: 0 axle position cannot be identified
1 to 250 axle position
8 Position (axle number) of lift axle 3
Resolution: 1/bit
Data range: 0 axle position cannot be identified
1 to 250 axle position
9 Position (axle number) of lift axle 4
Resolution: 1/bit
Data range: 0 axle position cannot be identified
1 to 250 axle position
10 Position (axle number) of lift axle 5
Resolution: 1/bit
Data range: 0 axle position cannot be identified
1 to 250 axle position
11 Wheel base: first axle to second axle (see Figure 11)
Resolution: 0,1 m/bit
Data range: 0 m to 25 m
12 Wheel base: second axle to third axle (see Figure 11)
Resolution: 0,1 m/bit
Data range: 0 m to 25 m

13 to 29 Wheel base: (Geometric data index - 10) axle to (Geometric data index - 9) axle

Resolution: 0,1 m/bit
Data range: 0 m to 25 m
30 to 250 Not defined
© ISO 2007 – All rights reserved 5
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ISO 11992-2:2003/Amd.1:2007(E)
a) Semi trailer
b) Drawbar trailer
c) Centre-axle trailer
Key
w track width
l length between coupling point and middle of the first axle
l distance between first axle and second axle in wheel base
l distance between second axle and third axle in wheel base
Figure 11 — Vehicle dimensions
6.4.2.2.49 Brake cylinder pressure first axle, left wheel
Actual pressure of the wheel-brake actuator at the left wheel of the first axle.
NOTE In the case of a drawbar trailer, “first axle” means the steering axle.
Data length: 1 byte
Resolution: 5 kPa/bit gain, 0 kPa offset
Data range: 0 kPa to 1250 kPa
Type: Measured
6 © ISO 2007 – All rights reserved
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ISO 11992-2:2003/Amd.1:2007(E)
6.4.2.2.50 Brake cylinder pressure first axle, right wheel

Actual pressure of the wheel-brake actuator at the right wheel of the first axle.

NOTE In the case of a drawbar trailer, “first axle” means the steering axle.
Data length: 1 byte
Resolution: 5 kPa/bit gain, 0 kPa offset
Data range: 0 kPa to 1250 kPa
Type: Measured
6.4.2.2.51 Brake cylinder pressure second axle, left wheel

Actual pressure of the wheel-brake actuator at the left wheel of the second axle.

Data length: 1 byte
Resolution: 5 kPa/bit gain, 0 kPa offset
Data range: 0 kPa to 1250 kPa
Type: Measured
6.4.2.2.52 Brake cylinder pressure second axle, right wheel

Actual pressure of the wheel-brake actuator at the right wheel of the second axle.

Data length: 1 byte
Resolution: 5 kPa/bit gain, 0 kPa offset
Data range: 0 kPa to 1250 kPa
Type: Measured
6.4.2.2.53 Brake cylinder pressure third axle, left wheel
Actual pressure of the wheel-brake actuator at the left wheel of the third axle.
Data length: 1 byte
Resolution: 5 kPa/bit gain, 0 kPa offset
Data range: 0 kPa to 1250 kPa
Type: Measured
6.4.2.2.54 Brake cylinder pressure third axle, right wheel

Actual pressure of the wheel-brake actuator at the right wheel of the third axle.

Data length: 1 byte
Resolution: 5 kPa/bit gain, 0 kPa offset
Data range: 0 kPa to 1250 kPa
Type: Measured
© ISO 2007 – All rights reserved 7
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ISO 11992-2:2003/Amd.1:2007(E)
6.4.2.2.55 Wheel speed first axle, left wheel
Unfiltered and unbalanced speed of the left wheel on the first axle.
NOTE 1 In the case of a drawbar trailer, “first axle” means the steering axle.

NOTE 2 In the case of a semi trailer, the first non-lifting axle equipped with wheel speed measuring sensors is used.

Both sensors are on the same axle.
Data length: 2 bytes
Resolution: 1/256 km/h/bit gain, 0 km/h offset
Data range: 0 km/h to 250 km/h
Type: Measured
6.4.2.2.56 Wheel speed first axle, right wheel
Unfiltered and unbalanced speed of the right wheel on the first axle.
NOTE 1 In the case of a drawbar trailer, “first axle” means the steering axle.

NOTE 2 In the case of a semi trailer, the first non-lifting axle equipped with wheel speed measuring sensors is used.

Both sensors are on the same axle.
Data length: 2 bytes
Resolution: 1/256 km/h/bit gain, 0 km/h offset
Data range: 0 km/h to 250 km/h
Type: Measured
6.4.2.2.57 ROP system enabled/disabled

Signal which indicates that the Roll Over Prevention (ROP) system is enabled or disabled.

NOTE In UNECE Regulation No. 13, Roll Over Prevention is referred to as Roll-Over Control.

00 — ROP system disabled
01 — ROP system enabled
Type: Measured
6.4.2.2.58 YC system enabled/disabled
Signal which indicates that the Yaw Control (YC) system is enabled or disabled.

NOTE In UNECE Regulation No. 13, Yaw Control is referred to as Directional Control.

00 — YC system disabled
01 — YC system enabled
Type: Measured
8 © ISO 2007 – All rights reserved
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ISO 11992-2:2003/Amd.1:2007(E)
6.4.2.2.59 Enable/disable trailer ROP system
Command signal to enable/disable the trailer Roll Over Prevention (ROP) system.

NOTE In UNECE Regulation No. 13, Roll Over Prevention is referred to as Roll-Over Control.

00 — Disable trailer ROP system
01 — Enable trailer ROP system
Type: Status
6.4.2.2.60 Enable/disable trailer YC system
Command signal to enable/disable the trailer Yaw Control (YC) system.

NOTE In UNECE Regulation No. 13, Yaw Control is referred to as Directional Control.

00 — Disable trailer YC system
01 — Enable trailer YC system
Type: Status
Page 28, Table 7
Renumber the existing Table 7 as “Table 8”.
Page 28
Insert the following new subclauses immediately after 6.4.2.3.36.
6.4.2.3.37 Axle Load
Static vertical load of a vehicle axle identified by tyre/wheel identification.
Data length: 2 bytes
Resolution: 0,5 kg/bit gain, 0 kg offset
Data range: 0 kg to 32127,5 kg
Type: Measured
6.4.2.3.38 Seconds
Part of a parameter used to represent time.
Data length: 1 byte
Resolution: 0,25 s/bit, 0 offset
Data range: 0 s to 59,75 s
Type: Measured
© ISO 2007 – All rights reserved 9
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ISO 11992-2:2003/Amd.1:2007(E)
6.4.2.3.39 Minutes
Part of a parameter used to represent time.
Data length: 1 byte
Resolution: 1 min/bit, 0 offset
Data range: 0 min to 59 min
Type: Measured
6.4.2.3.40 Hours
Part of a parameter used to represent time.
Data length: 1 byte
Resolution: 1 h/bit, 0 offset
Data range: 0 h to 23 h
Type: Measured
6.4.2.3.41 Day
Part of a parameter used to represent a calendar date.
Data length: 1 byte
Resolution: 0.25 days/bit, 0 offset
Data range: 0 day to 31,75 days
Type: Measured

NOTE 1 A value of 0 for the day is null. The values 1, 2, 3, and 4 are used to identify the first day of the month; 5, 6, 7,

and 8 identify the second day of the month, etc.
NOTE 2 This parameter does not influence or change the hours parameter above.
6.4.2.3.42 Month
Part of a parameter used to represent a calendar date.
Data length: 1 byte
Resolution: 1 month/bit, 0 offset
Data range: 1 month to 12 months
Type: Measured

NOTE A value of 0 for the month is null. The value 1 identifies January; 2 identifies February, etc.

10 © ISO 2007 – All rights reserved
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ISO 11992-2:2003/Amd.1:2007(E)
6.4.2.3.43 Year
Part of a parameter used to represent a calendar year.
Data length: 1 byte
Resolution: 1 year/bit, 1 985 years offset
Data range: 1 985 years to 2 235 years
Type: Measured

NOTE A value of 0 for the year identifies the year 1985; a value of 1 identifies 1986, etc.

6.4.2.3.44 Local Minute Offset
Local offset in minutes from a reference time.
Data length: 1 byte
Resolution: 1 min/bit, −125 min offset
Data range: −59 min to 59 min
Type: Measured
6.4.2.3.45 Local Hour Offset
Local offset in hours from a reference time.
Data length: 1 byte
Resolution: 1 h/bit, −125 h offset
Data range: −24 h to 23 h
Type: Measured
Page 28, 6.5

Replace the whole of 6.5, including the tables, with the following new subclause.

6.5 Messages
6.5.1 General

The following specifies the messages for use on the electrical connection between towing and towed vehicles.

All undefined bits shall be transmitted with a value of “1”. All undefined bits shall be treated as “don’t care”

(either masked out or ignored). This permits them to be defined and used in the future without causing any

incompatibilities.

A message is described by a short form of the function (e.g. EBS for electronic braking system and RGE for

running gear equipment) and two numbers.
© ISO 2007 – All rights reserved 11
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ISO 11992-2:2003/Amd.1:2007(E)
The first stands for the transmission direction:
...

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