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In-Vehicle Networking for Heavy Duty Systems Review of CAN / SAE J1939/ ISO 11783

In-Vehicle Networking for Heavy Duty Systems Review of CAN / SAE J1939/ ISO 11783. Physical Layers ISO 11783 Part 2 J1939-12. Hardware - Dimensions, Connectors, Wire. How far, how fast, how many nodes Types of nodes (if there are any). Etc. How long of a cable can we use?

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In-Vehicle Networking for Heavy Duty Systems Review of CAN / SAE J1939/ ISO 11783

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  1. In-Vehicle Networking for Heavy Duty SystemsReview of CAN / SAE J1939/ ISO 11783 Physical Layers ISO 11783 Part 2 J1939-12

  2. Hardware - Dimensions, Connectors, Wire • How far, how fast, how many nodes • Types of nodes (if there are any). Etc. • How long of a cable can we use? • Is this length a total length or from piece to piece? • Is there such a thing as a line driver, or booster? • What is required in the way of line terminations? FAQ

  3. ISO 11783 Physical Layer • Maximum number of ECU's • 30 (per segment) • Media • Twisted Quad un-shielded • 75 W nominal impedance • Two data lines (CAN_H, CAN_L) • Two termination supply lines • Signal • Compatable with ISO 11898 drivers (eg. Phillips 80C251)

  4. Twisted Quad Cable Cable Cross-section

  5. ISO 11783 Physical Layer • Bus Fault Tolerance: • Continued communications (emissions failure?) • CAN_H shorted to Vbat or Ground or interrupted • CAN-L shorted to Vbat or Ground or interrupted • Communications Failure • CAN_H Shorted to CAN_L • Terminator power interrupted • Termination: High impedance at nodes • Active terminators - differential current control • ECU Conformance Testing: Specified

  6. Bus Length and Geometry • Maximum Segment Length (L): 40 m • Maximum Drop Length (S): 1.0 m • Minimum Node Separation (d): 0.1 m

  7. ISO 11783 Connectors

  8. Automatic Terminating Bias Connector • Disconnection does not disrupt communications • Provides Power and data

  9. Bus Extension • Bridges could be used to extend the bus but are not permitted in the main implement bus on ISO 11783 • Repeaters cannot be used • They extend propagation delay and are not an advantage in extending the bus

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