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USB Pinout

Discussion in 'General Electronics Discussion' started by vick5821, Aug 28, 2012.

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  1. vick5821

    vick5821

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    Jan 22, 2012
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Neither, maybe both.

    Don't rely on the colours.

    Measure the resistance from each wire back to the plug to be sure.
     
  3. vick5821

    vick5821

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    Jan 22, 2012
    How to be sure ?
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    http://en.wikipedia.org/wiki/Universal_Serial_Bus

    Colors can be changed. Measure from the open end of the wire to the respective pin of the USB connector. If the resistance is low, wire and pin are connected.
     
  5. vick5821

    vick5821

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    Jan 22, 2012
    so Pin 1 is Vcc pin 2 is D- ??
     
  6. Harald Kapp

    Harald Kapp Moderator Moderator

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    If you don't trust Wikipedia, read the original USB specification (USB_20.PDF in the ZIP archive, chapter 6.4, page 88 ff.).
     
  7. vick5821

    vick5821

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    Jan 22, 2012
    ok, so conclusion that i can get is white is D-.thanks :)
     
  8. CocaCola

    CocaCola

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    Apr 7, 2012
    As other have tried to tell you NEVER trust a wire color to remain consistent from cable to cable, even if the 'standard' list a color code... Trust me you will get burned and find out the hard way that manufactures rarely follow a set color code on fixed end cables... Manufactures will use what they have on hand, if they have a 4 conductor wire that is red, orange, green and black that they use for whatever and it will work for their USB cables they will likely use it vs sourcing the proper red, green, black and white cable... And even if they do use the right colored cables, there is no guarantee that they used it properly...

    Always do a continuity test to the plug and verify what wire goes where...
     
    Last edited: Aug 28, 2012
  9. vick5821

    vick5821

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    Jan 22, 2012
    but the sequence is like this right ?

    Pin 1 VCC
    Pin 2 D-
    Pin 3 D+
    Pin 4 GND

    ??
     
  10. vinod chandran

    vinod chandran

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    Jun 21, 2011
    Hi,
    Don't trust colors. I have got an usb cable with black is Vcc and green is Gnd. What we need to do is to measure with DMM.
     
  11. rodrilyx

    rodrilyx

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    Aug 29, 2012
    Check it with a multimeter!

    Also you can use a led with a resistor 200Ohms for check it!
     
    Last edited: Aug 29, 2012
  12. vick5821

    vick5821

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    Jan 22, 2012
    check the continuity ? But how to check which is D+ D-?
     
  13. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    Ignore Rodrilyx. His first comment was OK, but the rest are questionable.

    Determine what are D+ and D- by using your multimeter on the Ohms range to test what pin the wires are connected to.

    You should do that for all 4 connections.

    Then you can verify by ensuring that +5V appears across the Vcc/Gnd pins.
     
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