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  • com port pin 8 problem

    Ok I can not seem to get my computer to shutdown/hibernate when my acc. line 12v goes away from pin 8 on the comport. I have set up a generic UPS to look for negative. The thing is, it just goes to "battery power" and never shuts down. Any ideas as to why it is not working right?

    2004 Nissan 350z Daytona Blue
    2x 10" IDMax D4
    1250.1 kicker amp
    crappy dell carputer


  • #2
    Is it ok to feed 12V into that pin? Shouldn't it be 5V max?
    Progress: 80% - Permanent install left.
    Motion LS800 Tablet PC and dock.
    Vista, Bu-535 GPS, RoadRunner, MPT2006.

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    • #3
      its ok to have 12v they can take like 20v or somewhere close to there.

      2004 Nissan 350z Daytona Blue
      2x 10" IDMax D4
      1250.1 kicker amp
      crappy dell carputer

      Comment


      • #4
        Negative or a low? If it's looking for a negative it shouldn't activate if it's only getting zero volts.
        Rick S.

        XP Pro SP2, Soyo P4RC350 MB, Nvidia FX5200, 320W PS, Inverter & uSDC20D, 2.4GHz CeleronD320, 512MB DDR, 30GB 3.5", Pioneer 106s Slot DVD, Linksys WMP54G WiFi, Lilliput 7" & 4" TFT LCD, Zippy EL610 Keyboard, Touchpad, Garmin GPS V

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        • #5
          I've connected 3.3, 5, and 6 and it worked. I think the threshold is around 3.0 volts and doesn't have to go to 0 or negative, at least on what I've messed with. I don't remember if it was pin 8 though. Is that the right one?

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          • #6
            I have an acc line connected to pin 8. Therefore my computer will shut down when I turn my car off. So its going form 12v to 0v. I know other people have did this successfully so it will work, it just doesn't work for me :P

            I have it setup with Power fail/On battery and negative checked. It will give me a dialog saying power failed or something then it just thinks its on battery power.

            2004 Nissan 350z Daytona Blue
            2x 10" IDMax D4
            1250.1 kicker amp
            crappy dell carputer

            Comment


            • #7
              What about the "Configure..." part? I just noticed this. There's a Second between power failure and first notification (default 5), then some other stuff and and Shutdown or Hibernate option. What's all that stuff do?

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              • #8
                This is something I've had on my list to try so I decided to give it a go. If I configure the machine with 'negative' for the 'on-battery' (pin 8) notification, and hit apply with nothing connected, the machine will immediately go into hibernation (and straight back into it after I resume). I tried configuring it with pin 8 connected to the 12V input and it did not immediately shutdown this time. When I then removed the +12V, the UI correctly switched to the 'on battery' state and the machine happily kept running - seemingly indefinitely. Not quite what I expected given the posts I'd read from people doing exactly this.
                Progress: 80% - Permanent install left.
                Motion LS800 Tablet PC and dock.
                Vista, Bu-535 GPS, RoadRunner, MPT2006.

                Comment


                • #9
                  Can someone with this working post screen shots? I've read it's possible to get this to work with a 30sec delay (as opposed to immediately) and I'd love to know how to do that especially.
                  Progress: 80% - Permanent install left.
                  Motion LS800 Tablet PC and dock.
                  Vista, Bu-535 GPS, RoadRunner, MPT2006.

                  Comment


                  • #10
                    I would think that On Battery would just cause a notification like when the power goes out for a few seconds (or longer). You don't want it to shut down from that, but from low battery. That's when it's time to shut down very soon, and maybe the timer config has something to do with that.

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                    • #11
                      I do want it to shut down from 'on battery'. That's kind of the point of using the fake ups trick - detect when the ignition is switched off and trigger the PC to shutdown immediately. Now in my case, the acc line also goes off during crank and I don't want that to trigger the shut down - hence the desire for a delay before the PC decides it's time to shutdown.
                      Progress: 80% - Permanent install left.
                      Motion LS800 Tablet PC and dock.
                      Vista, Bu-535 GPS, RoadRunner, MPT2006.

                      Comment


                      • #12
                        If memory serves me correctly the default minimum delay in windows is 2 minutes... Fortunately you can set this time to 1 or 0 minutes in the registry

                        HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\UPS\Config\ShutdownOnBatteryWait =0

                        -momanz
                        Carputer installed!!!
                        Nlited XP+Minlogon, EpiaM10k, 512mb, Seagate 40 gig 2.5" HD, FM Dlink usb radio, DWL122 USB Wifi, XMD1000 tuner, PT5071 6 amp regulator, Xenarc 700TSV, and 1 ikea key box.

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                        • #13
                          Fooled around with it some more tonight and still have not gotten it to work...anyone with some insight, screenshots, detailed how-to, please don't hesitate.

                          2004 Nissan 350z Daytona Blue
                          2x 10" IDMax D4
                          1250.1 kicker amp
                          crappy dell carputer

                          Comment


                          • #14
                            I fooled around with this some more and now have it shutting down immediately into hibernate. That's not quite what I want (I want a 30 second delay to allow brief interruptions to the acc line during the crank to be ignored).

                            I had it correctly configured as far as I could tell and it wasn't working at all. The UI would correctly show 'on battery' but nothing would happen. So I enabled the next check box (the low battery one) and set it to negative. Clicked apply (and after the exact 30 seconds it takes to apply these simple changes), the machine immediately went into hibernate. So I resumed (having reconnected the 12V input) and unchecked that checkbox and the computer continues to go into hibernate immediately - and I'm now back to my original settings that didn't work! What a load of $^$%.
                            Progress: 80% - Permanent install left.
                            Motion LS800 Tablet PC and dock.
                            Vista, Bu-535 GPS, RoadRunner, MPT2006.

                            Comment


                            • #15
                              Hi Carter

                              I had what i think is a similiar situation, my acc line didnt drop to 0v quick enough, so there was always power present on the acc line, even though the key was off, I tried lights, resistors and what not to encourage the line to drop sooner, eventually a relay was the trick and even then a schotky diode was needed to pull the power sooner rather than later, I would suggest hooking up a multimeter on the acc line and ground and seeing what it does, if it drops to 0v immediately its not the problem, but at least its one thing off the list !!! good luck
                              Nano ITX / 512 MB / 60 GB / Panasonic slot load / M1-ATX / Bu303 / Sound blaster 24 / PPi amps / rockford sub

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