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Diagnostic port

Discussion in 'Roadster' started by opoipi, May 26, 2015.

  1. opoipi

    opoipi Member

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    Hi everybody,
    someone knows the name of Tesla Roadster diagnostic port?
    And where to buy the male connector?
    Thanks
     
  2. supersnoop

    supersnoop Tesla Roadster #334

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  3. opoipi

    opoipi Member

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    Thanks supersnoop,
    I've already bought it from Fasttech but I need just the connector.
    For this reason maybe if I'd know its name (I think it's a standard one) I'll be able to find it on the market.
     
  4. spaceballs

    spaceballs Member

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  5. markwj

    markwj Moderator, Asia Pacific

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    diagportconn.jpg

    In the roadster, there are four CAN buses. CAN0 on the right, and CAN3 on the left. Pinouts are H at the top, L at the bottom. As indicated, there are +12V permanent and GND pins available two. We use CAN0 (as indicated) for our work on the roadster, as that is the bus with the instrument stuff on it.

    Plus is
    TE Connectivity / AMP 173851-2

    and matching pins are
    173631-1

    Socket is
    TE Connectivity / AMP 174933-1

    and matching pins are
    173645-1
     
  6. jeremyz

    jeremyz Member

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    Mark, What kind of traffic goes over each of the CAN buses? Why is there a need for four separate CAN buses? Can you see all the traffic that is going between the ESS and the PEM from the CAN buses that are available in the diagnostic connector? Thanks.
     
  7. markwj

    markwj Moderator, Asia Pacific

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    It is common practice in modern automobiles to separate the different parts of the car out from each other by putting them on different CAN buses.

    For example, on the roadster, the buses are split:

    * Power Train (PEM, body control, parking lock, gear selector, ABS)
    * Energy Storage (HVAC, Battery x13)
    * Driver Feedback aka Instrumentation (Instrument Cluster, Touchscreen, TPMS)

    The idea is that a faulty component on the Driver Feedback bus shouldn't affect the power train (for example). Also, the bandwidth of each bus is kept to just what is required by the modules on that bus.

    All three buses go into the Vehicle Management System (VMS). That does have some capabilities for reflecting information on one bus onto another, but in general each bus has its own unique messages and information.

    Yes, that connector provides access to all the above three buses.

    Firmware-Processors_diagramER.png
     
  8. jeremyz

    jeremyz Member

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    Thanks for the detailed explanation. Do you know what kind of micro-controller is in the VMS? I didn't realize that the brains of the roadster was outside of the PEM.
     
  9. markwj

    markwj Moderator, Asia Pacific

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    Someone mentioned it recently, somewhere on the interwebs, but I can't remember who/what/where. I seem to remember them saying it was a 4 CAN bus ST microcontroller, but not certain.
     
  10. wiztecy

    wiztecy Active Member

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    #10 wiztecy, Dec 2, 2015
    Last edited: Dec 2, 2015
    Its an NXP LPC2294 chip which is an Arm 7 based microcontroller (with 4 CAN controllers):

    http://www.nxp.com/documents/data_sheet/LPC2292_2294.pdf
     
  11. baks

    baks Member

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    Sorry, for the Model S also?
     
  12. markwj

    markwj Moderator, Asia Pacific

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    Design of the Model S is slightly different, but based on the same model. Multiple buses. In the Model S, the instrumentation uses ethernet, and a CAN-to-ethernet gateway is used to bridge the two.
     

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