User Manual
Table Of Contents
- CAN interface for bodywork
- Introduction
- Summary of CAN messages
- Detailed description of CAN messages
- Explanation
- CAN messages sent to the vehicle
- CAN messages sent from the vehicle
- Software identification
- Scania bodywork status message 1
- Air Supply Pressure
- Air Suspension Control 1
- Alarm Status Proprietary
- Ambient Conditions
- BAM-E
- Cab Illumination Message
- Cab Information Proprietary 1
- Cruise Control/Vehicle Speed
- Crash Occured
- Coordinator General Information
- Coordinator General Information 2
- CUV information
- Dash Display
- DLN2-Proprietary
- DLN5-Proprietary
- DLN8-Proprietary
- DM1
- EAC1-K
- EBC1
- EBC2 Wheel Speed Proprietary
- EBC4 Wheel Brake Lining Remaining Information
- EBC5
- EEC1
- EEC2
- Engine Configuration Messages
- Engine Fluid Level/Pressure 1
- Engine Hours, Revolutions
- Engine Temperature
- ERC1-RD
- ETC1 - T
- ETC1 - CV
- ETC2
- ETC7
- Fuel Consumption
- Fuel Economy
- High Resolution Vehicle Distance
- Inlet/Exhaust Conditions
- PTO information Proprietary
- Retarder Fluids
- Supply Pressure
- TCO1
- Time/Date
- Transmisson Control 1 (TC1)
- Transmission Fluids
- Transmission Proprietary/DLN5
- Transmission Proprietary 2 - T
- Transmission Proprietary 2 - AWD
- Vehicle Weight
- Vehicle Weight
- Requirements for CAN communication with the vehicle
©
Scania CV AB 2013, Sweden
CAN interface for bodywork
Requirements for CAN communication with the vehicle
11:90-01 Issue 1 en-GB 130 (139)
SAE J1939-21 Data Link Layer
SAE J1939-21 defines five message types:
• Commands - Not supported.
• Requests - Not supported.
• Broadcast/Response - All available information is sent periodically.
• Acknowledgement - Not supported.
• Group Functions - Proprietary messages and Multipacket messages, TP.CM,
TP.DT, are supported.
Note:
According to section 5.2.1 SAE J1939-21, Revised Version July 1998, priority bits
in message identifiers must be filtered out and ignored by the receivers.
General guidelines
• Control units connected to a CAN bus must be able to handle up to 100% CAN
bus load with the correct messages with no significant functional limitations or
malfunctions.
• As a rule of thumb, CAN bus load should not exceed 80%.
• Closing control loops over the CAN is not recommended as the guaranteed access
time is relatively long and fast control loops require a lot of bandwidth. If closed
control loops over the CAN are still required, then they must be fully capable of
sending the necessary CAN messages using only half the transmission frequency.
IMPORTANT!
The bodybuilder is responsible for ensuring that the external CAN bus is used cor-
rectly.