Results 1 to 6 of 6

Thread: ACPI Wiring question.

  1. #1
    Low Bitrate
    Join Date
    Dec 2010
    Posts
    58

    ACPI Wiring question.

    OK my P1900 is going in my car this weekend. I am placing a switch on my center console that controls the IGN signal to the carnetix. This is for disabling the PC similar to a valet switch. I also have a momentary switch installed. The momentary switch I would like to tap it into the laptop along with the P1900 ACPI wires. If the computer freezes I can hold the switch and reboot.

    So the main question is once the P1900 is wired into the power switch. What happens if I use the original switch when the P1900 is running the laptop. Like say if I press the power switch does the P1900 know to start the shutdown procedure even though there is no change on the IGN signal?

    Also I have read over the manual and seem to know what I am doing, seems straight forward, but if there is anything common that I may miss, feel free to remind me

  2. #2
    Neither darque nor pervert DarquePervert's Avatar
    Join Date
    Apr 2004
    Location
    Elsewhere
    Posts
    13,949
    All the P1900 will do is send an electrical pulse to the ACPI motherboard headers. That pulse simulates a press of the power button.
    If the PC is on when it receives that pulse, the PC will shut off, and vice-versa.
    Have you looked in the FAQ yet?
    How about the Wiki?



    Under normal circumstances, a signature would go here.

  3. #3
    Low Bitrate
    Join Date
    Dec 2010
    Posts
    58
    So basically if the PC was shut off using the power switch after the car is running and IGN is still ON the computer would commence a boot sequence when turning off the car because it would assume the computer is still running? so basically all I could use the switch for is for hard restarts? correct?

  4. #4
    MySQL Error soundman98's Avatar
    Join Date
    Jan 2008
    Location
    on the border of northern IL/IN
    Posts
    5,848
    when the pc turns on, it shorts some wires in the 20 pin harness. this allows the psu to know what the pc is doing.

    if you start the car, the pc turns on, and while at a stoplight, decide to turn off the pc using your dash switch, the pc would turn off, and when you get to your destination, and turn the car off, the psu would see that the pc is off, and would not send another power switch pulse in a effort to turn it off.

  5. #5
    FLAC PhilG's Avatar
    Join Date
    Mar 2009
    Location
    Ontario, Canada
    Posts
    982
    Soundman is right however I have had instances when the 1900 gets out of sink with the PC and the PC ends up continuing to run after I have left the vehicle but no harm done; it's only running on the laptop battery so the no draw on the vehicle. You do end up powering down the laptop with the switch though before starting the vehicle so everything will be in sink; otherwise the 1900 powers up and turns off the laptop. It doesn't happen very often and I can't remember what events led up to the situation but just be aware. It catches you off guard the first time because the 1900 is running, the touchscreen is running but no image (because the laptop has just been shut down).
    My 2007 Ford F350 Work Log located HERE

  6. #6
    Low Bitrate
    Join Date
    Dec 2010
    Posts
    58
    Thanks for the replies. Just got it today and I will report any problems.

Similar Threads

  1. P2140 SLOW! timer and ACPI question.
    By shahabmusic in forum CNX-P2140
    Replies: 0
    Last Post: 03-02-2010, 01:54 PM
  2. wiring question
    By stangg172006 in forum General MP3Car Discussion
    Replies: 10
    Last Post: 05-06-2007, 01:02 AM
  3. Question on ACPi, M10000, and Travla c138
    By ephyouckay in forum Power Supplies
    Replies: 1
    Last Post: 02-03-2007, 11:19 PM
  4. Power Wiring Issue & General Wiring Question
    By speed_krazy in forum Newbie
    Replies: 0
    Last Post: 05-19-2006, 01:17 PM
  5. ACPI Question For M10000
    By tbird2340 in forum General MP3Car Discussion
    Replies: 0
    Last Post: 03-24-2006, 09:49 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •