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Thread: Wiring Question (long)

  1. #1
    Variable Bitrate
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    May 2001
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    Toronto, Canada
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    355

    Post Wiring Question (long)

    OK, I'm finally ready to mount my PC in my car, and I'm trying to find a way to minimize the number of wires I'll need to run from the trunk to the dash. Here are all the required connections:
    - serial cable from COM port on PC to LCD
    - +12V and ground from PC to LCD (backlight)
    - PS/2 for keypad
    - 2 wires for ATX power switch
    Here is what I want to do, and I nede input re. if this can be done without interferance becomming an issue:
    1) Because the LCD only uses 3 pins from the serial port, I would also like to run the +12V and ground for the backlight through the serial cable
    2) I would like to run the 6 wires for the PS/2 keypad plus the 2 wires for the ATX power switch through a CAT-5 cable

    I'm not too worried about the part 2 because everything will be low voltage, but I'm not sure about running +12V through a serial cable. I know that the wires inside serial cables are a high guage (thin), so would I be better off running the +12V and the ground for the backlight seperately using thicker wires and should this be OK?
    The reason I've chosen 1 serial cable and 1 CAT-5 cable is because I already have a 25ft. serial calbe and a 25ft. CAT-5 cable laying around, so I'd like to use these if possible.
    Any advise would be greatly appreciated!

    Thanks,
    Mike.

  2. #2
    Maximum Bitrate gizmomkr's Avatar
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    Dec 2000
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    Smyrna, Ga, USA
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    Post

    The lcd ( based on your 3 wire description) I assume is character ( not VGA ).

    They typically use LED's as a backlight, they have an extreemly small current requirement, using the serial cable should not be a problem.

    Everything else is also low voltage, and you will not have anny problems runing that over cat 5
    Gizmo-
    Techonlogy on Wheels
    http://www.hjnetworks.com/car

  3. #3
    Variable Bitrate
    Join Date
    May 2001
    Location
    Toronto, Canada
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    Post

    Sorry, I should have ellaborated on this. The LCD is indeed a character LCD, the wide voltage Matrix Orbital 20X2. This LCD requires 12VDC for the backlight, so I will be running 12V from the computer power supply through the serial cable. Is this possible?

    Thanks!

  4. #4
    Newbie
    Join Date
    Feb 2001
    Location
    Cottonwood, AZ USA
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    Post

    All of my switchs are run though Cat 5, as well as my VGA termanator.
    --BLK
    Wide awake
    and keeping distance from my soul - Tool

  5. #5
    Maximum Bitrate gizmomkr's Avatar
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    Dec 2000
    Location
    Smyrna, Ga, USA
    Posts
    778

    Post

    Yeah, none of those devices should be a problem.
    Gizmo-
    Techonlogy on Wheels
    http://www.hjnetworks.com/car

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