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Communication networks

Discussion in 'Roadster: Technical' started by Kelvin, Jan 9, 2009.

  1. Kelvin

    Kelvin New Member

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    Hi, I'm new here and this is my first post.

    I'm interested in the electronic communication of the roadster. Traditionally OEMs use combinations of communication networks, depending on the purpose of the installation, for example a common multi-purpose serial communication standard as CAN, but also new upcomers like MOST for multimedia/infotainment and Flexray for X-by-wire applications is seen more and more, at least in european cars. Anyone who knows what solution Tesla has decided to go with?

    I know that I've seen CARB being mentioned in technical blogs about the roadster, which suggests that there should be a OBD socket in the roadster, leaving an access point for scan tools. I haven't had the opportunity to sit in one, so I haven't had the chance to verify this. Anyone?
     
  2. graham

    graham Active Member

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    Welcome!

    This is not information I have seen here before (although it seems like something TEG might know). The Roadster has a lot of proprietary stuff locked in the PEM - it would not surprise me to hear that they developed their own protocols for some standard communications.

    Externally there is a USB port for onboard diagnostics. I do not know of any additional port internally, but that doesn't mean it does not exist. They have not published the protocols used by the USB port, and it is assumed it is non-standard.
     
  3. doug

    doug Administrator / Head Moderator

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    There is an OBD port. It's under the dash in the upper right of the driver's side foot well (at least in the Validation Prototypes (VPs)). There's also the USB port graham mentions, it under the center console arch. Some photos from VP12 below.


    OBD connector:
    [​IMG]


    USB port:
    [​IMG]
     
  4. Kelvin

    Kelvin New Member

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    Is the USB-port you talking about only used for onboard diagnostics or is this where you're supposed to connect your iPod etc?
     
  5. doug

    doug Administrator / Head Moderator

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    So far the USB port isn't for customer use. The technicians use it to download data logs and I assume it's also used to upload firmware updates. There is a separate iPod connector which I assume just goes to the JVC headunit.
     
  6. Kelvin

    Kelvin New Member

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    Interesting, but I sure hope they hide those cables in the customer vehicles! Not so premium. :wink:
     
  7. TEG

    TEG TMC Moderator

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  8. Kelvin

    Kelvin New Member

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    Thanks guys, you've all been very helpful. I appreciate it.

    Btw, what's the main reason of your Tesla knowledge? Work? Ownership? Just interest?
     
  9. WarpedOne

    WarpedOne Supreme Premier

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    Interest squared! :D
     
  10. graham

    graham Active Member

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    Some are owners, some are electric car enthusiasts, some are sports car enthusiasts, occasional current and former Tesla employees and the random Internet trolls you get on every public forum...
     
  11. TEG

    TEG TMC Moderator

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    ...Just interest...
     
  12. TEG

    TEG TMC Moderator

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    ...electric car & sports car enthusiast...
     
  13. vfx

    vfx Well-Known Member

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    Dreamers...
     
  14. graham

    graham Active Member

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  15. TEG

    TEG TMC Moderator

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    #15 TEG, May 1, 2009
    Last edited: May 1, 2009
    OBD2, CAN bus, other car network technologies

    Someone posted this picture of the glove box of the Tesla/Smart prototype:
    3488889952_58276e55a2_b.jpg

    So we have OBD2 on the left, 3 CAN busses, and a USB connector for something.

    Some of the more technically minded on this forum have asked questions about protocols used for car control, so I thought I would throw out some links of publications and projects useful if you really wanted to understand how this stuff works.

    On-Board Diagnostics for Light and Medium Duty Vehicles Standards Manual - 2006 Edition
    Card Labs - OBDII Resources
    OpenDiag
    OBD-II PIDs - Wikipedia, the free encyclopedia
    prj.perquin.com
    obd_connector.gif
     
  16. TEG

    TEG TMC Moderator

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    I am going to guess that the USB could be used for firmware updates.
     
  17. Joseph

    Joseph Member

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    I recall a picture of a Tesla employee using a USB stick with the Roadster. I think the USB stick is located near the floor in the middle of the car.

    Anyone remember where the USB port for the Roadster is? If it exists - I only remember seeing a picture.
     
  18. TEG

    TEG TMC Moderator

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  19. mpt

    mpt Electrics are back

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