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monitor pinout

Discussion in 'Electronic Basics' started by [email protected], May 28, 2007.

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  1. Guest

    I was wondering if anyone knows the pinout for the standard 15 pin PC
    monitor connection. I found talk of it from sketchy sources like
    http://acl.co.uk/pinouts.htm, but then I found other sites that
    contradict that. I'm hoping for something authoritative if possible.

    Thank you.
     
  2. Bob Myers

    Bob Myers Guest

    Sure. The following assumes a fairly current monitor (something
    made in, say, the last ten years), one which supports the VESA
    DDC standard pinout:

    Pins 1, 2, and 3 (along the top row) are the Red, Green,
    and Blue video signals, respectively.

    Directly below them (6, 7, and 8) are the returns for each
    signal.

    The TTL syncs are on pins 13 (horizontal) and 14
    (vertical), with the sync return on pin 10.

    Pins 9, 12, and 15 comprise the VESA Display Data Channel
    connections themselves - this is a monitor identification and
    control channel, which you may not be concerned with in your
    application. Pin 9 is a + 5 VDC supply from the video source,
    pin 12 is the bidirectional serial data line (SDA), and pin 15 is
    the serial clock (SCL) (the names are taken from the "I2C"
    electrical interface, on which DDC is based). All share a return
    on pin 5. Some monitors will need to see a +5V supply on pin
    9 to sense an active video source, and some sources will expect
    to see a load on pin 9 in order to "believe" there's a monitor
    connected.

    Pins 4 and 11 are reserved (no connects) in the standard usage
    of this connector. In the very early days, these (along with pins
    12 and 15, now used for DDC) were used for a very simple
    hardwired display identification system, but that hasn't been
    used for years.

    Bob M.
     
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