com port pin 8 problem

**Carter** · 02-06-2005, 01:13 PM

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?

**Arathranar** · 02-06-2005, 01:21 PM

Is it ok to feed 12V into that pin? Shouldn't it be 5V max?

**Carter** · 02-06-2005, 01:25 PM

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

**strohmrs** · 02-06-2005, 02:09 PM

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

**Curiosity** · 02-06-2005, 02:40 PM

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?

**Carter** · 02-06-2005, 02:55 PM

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.

**Curiosity** · 02-06-2005, 03:11 PM

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?

**Arathranar** · 02-06-2005, 07:35 PM

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.

**Arathranar** · 02-06-2005, 07:45 PM

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.

**Curiosity** · 02-06-2005, 08:21 PM

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.