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Multiplex signals and cameras?

Discussion in 'Misc Electronics' started by Robert, Nov 7, 2004.

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  1. Robert

    Robert Guest

    Hi all,

    I need to combine several analog signals (DC voltage swing from 0V to 12VDC,
    from switches, relays, etc.) and send it to another device using
    multiplexing.

    I first need to find more information regarding multiplexing. I am hoping I
    can find a way to send bi-directional signals through 3 wires (Hi, Low,
    Shield).

    But I have two cameras that need to be implemented into my design (just two
    CCD cameras that monitor a machine). But the signal from the camera goes
    back to the unit sending the multiplexed signal!

    Right now, I have 16 wires sending signal between both devices.

    I need to simplify, ideally, 3 wire multiplex would be best.

    (Concert lighting uses "DMX" which has 512 channels of control, interesting
    stuff indeed. But I don't think I've seen bi-directional DMX in that
    industry).

    I guess the camera signal would have to be converted to digital (it has
    composite outputs).

    Oh, and if anyone has any information where I can find multiplexing
    information, that would be greatly appreciated (information leading me
    towards design).

    Cheers!

    Robert
     
  2. CWatters

    CWatters Guest

    How about 3 wires....

    1) 0V/screen
    2) Composite video from camera
    3) Multiplexed data

    2 and 3 go in opposite directions.

    3 could be bidirectional

    Google "1 wire signaling" to do 3) perhaps?
    Hint.. http://www.webster-dictionary.org/definition/1-Wire

    If you want to be clever synchronise the data to the video to reduce noise
    on the video signal.
     
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