Understanding CAN Bus Communication in Vehicles

 
What is the CAN Bus ?
A two wire electronic communication data bus
between ‘processors’ – i.e. computer computer
controllers
Developed by Robert Bosch Gmbh in 1983
Publically released at the SAE Detroit Conference
1986.
Has 12V and 24V versions.
 
 
 
 
 
 
Can Bus
 
The CAN bus provides hardware and firmware
communication protocol for communication between
distributed processors without a host.
 
 
 
Can Bus
 
Can Bus – Physical Layer
 
The usual transmission speed
on trucks is is 250 kB/s.
The low speed bus J1708
transmits at 9000 B/s
 
Data transmissions can be transmitted , received and
processed by all processors that are connected to the
data bus.
The message header has 21 bits. Eight bytes of data
follow.
The message header has a priority level, message
type identifiers and error checking bits.
The ECM is ECM is programmed to either regularly
broadcast a message or broadcast upon request.
 
 
 
Can Bus Data
 
SAE J1939
ISO 11898-1
  
CAN 2.0b
These standards have been compatible since year
2000, so a USA CAN bus can talk to a European CAN
bus 
if the voltage level is the same
.
Europe mandated a ‘public’ data bus on heavy trucks
in 2004  (‘EOBD’).
The USA has mandated a public data bus on light and
medium duty vehicles since 1996.
 
 
Can Bus Standards
 
 
Can Bus Converters
 
Brake Connectors
 
Can Bus Broadcast Data
 
Can Bus Broadcast Data
 
Can Bus Broadcast Data
 
Brake Application
 
Can Bus Readers
 
Black Box Approach to Fault Finding
 
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CAN Bus, a two-wire electronic data communication system, revolutionized vehicle technology by enabling seamless communication between various processors without a central host. Developed in 1983 by Robert Bosch GmbH, CAN Bus has become a standard in automotive engineering, providing a reliable hardware and firmware protocol for efficient data transmission. Learn about its physical layer, data transmission process, standards, converters, and more in the world of automotive communication technology.


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  1. Can Bus What is the CAN Bus ? A two wire electronic communication data bus between processors i.e. computer computer controllers Developed by Robert Bosch Gmbh in 1983 Publically released at the SAE Detroit Conference 1986. Has 12V and 24V versions.

  2. Can Bus The CAN bus provides hardware and firmware communication protocol for communication between distributed processors without a host.

  3. Can Bus Physical Layer The usual transmission speed on trucks is is 250 kB/s. The low speed bus J1708 transmits at 9000 B/s

  4. Can Bus Data Data transmissions can be transmitted , received and processed by all processors that are connected to the data bus. The message header has 21 bits. Eight bytes of data follow. The message header has a priority level, message type identifiers and error checking bits. The ECM is ECM is programmed to either regularly broadcast a message or broadcast upon request.

  5. Can Bus Standards SAE J1939 ISO 11898-1 CAN 2.0b These standards have been compatible since year 2000, so a USA CAN bus can talk to a European CAN bus if the voltage level is the same. Europe mandated a public data bus on heavy trucks in 2004 ( EOBD ). The USA has mandated a public data bus on light and medium duty vehicles since 1996.

  6. Can Bus Converters

  7. Brake Connectors

  8. Can Bus Broadcast Data

  9. Can Bus Broadcast Data

  10. Can Bus Broadcast Data

  11. Brake Application

  12. Can Bus Readers

  13. Black Box Approach to Fault Finding

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