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Thread: Does anyone make a USB only reader?

  1. #1
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    Does anyone make a USB only reader?

    I've been searching the web all day with no luck. I was wondering if any company made a USB reader (not serial converted to USB, real 2.0 USB) that could be used for real-time data acquisition, things like speed, rpm, etc in which the data comes in fast enough to be useful in real time?

    Anything in which drivers are included? I want to use the info as a primary dashboard for a vehicle. But it looks like the info wouldn't travel (or poll OBDII) quick enough to be used in this manner...?

  2. #2
    Constant Bitrate joeyoravec's Avatar
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    Please consider my company's Mongoose family of products. Each version uses full-speed USB 2.0 (12mbps) provided on-chip by a 32-bit ARM microprocessor. No crappy serial converter chips. If you want speed at a low cost, this is the interface for you.

    It comes with a DLL (J2534) if you want to develop your own software. Feel free to email, call the office, or post here if you have any questions.

  3. #3
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    That sounds like what I am looking for. I will give you a call tomorrow.

  4. #4
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    If you want a device that supports multiple protocols and is USB 2.0 compatible try http://www.obd-shop.com, I am currently using the AGV3000 model which supports multiple protocols.(ISO9141-2, KWP2000, PWM, KKL)

    I use the ELM compatibility to drive a virtual dash and the KKL lines to use the more powerful VAG.COM on my car.

    The company also sells them on ebay, so you might be able to pick one up cheaper.

  5. #5
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    Also keep in mind that the speed bottleneck is not the serial connection, but the vehicle's infrastructure itself. USB won't be any faster than a well designed serial connection to the vehicle.

  6. #6
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    Hmm.

    How fast might I be able to pull info from a running vehicle then? I am not sure what the correct terminology might be, so I am looking for something like 4 "cycles" of info per second or something like that? Anyone have any info on how many "polls" of info per second can be achieved consistently?

    Thanks,
    Jeff

  7. #7
    Constant Bitrate joeyoravec's Avatar
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    DavidL, I'm not sure I agree. It's fairly easy to handle ISO9141 at 9600 baud. But with J1850 you're talking 10.4k, 41.6k, or even 83.2k baud and with CAN you're up to 500k baud. Not to mention, the ELM uses an inefficient ASCII wire protocol. There is room for improvement.

    With mode 01 or mode 22 request-response, it might not be an issue because most OBD-II controllers limit these polling modes to 33 parameters/sec. For real performance (like the original poster asked), mode 2A rapid packet will send 150-250 responses/sec on the GM and Ford controllers that I've tested. Because you can pack several bytes into a rapid packet response, it's even faster.

    It just depends on your expectations. Speed helps, especially with a virtual dash that displays a lot of parameters.

  8. #8
    FLAC SFiorito's Avatar
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    USB2.0 is not 12mbps. USB2.0 is 480mbps. USB1.0 is 12mbps.

  9. #9
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    hey joey, how long before you have a gm version available? I am looking to set up a stand alone pc in my car just for an instrament panel display, can your setup work with linux, since this will be the sole purpose of this machine I want it to be as reliable & quick as possible..... I actually would be looking for someone I can pay to set up a machine like this, software wise, any interest there?

  10. #10
    Constant Bitrate joeyoravec's Avatar
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    Quote Originally Posted by SFiorito
    USB2.0 is not 12mbps. USB2.0 is 480mbps. USB1.0 is 12mbps.
    No.

    Low-speed USB 2.0 is 1.5mbps, full-speed USB 2.0 is 12mbps, high-speed USB 2.0 is 480mbps. The version of the specification does not indicate the speed. There are three supported speeds.

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