[Nut-upsuser] Using NUT to detect a normally closed circuit opening

[Arjen de Korte]

Citeren James Smith <james.smith op jofco.com>:

> I now have everything in place and I get an email when the temp sensor opens
>
> Question - what do I set so the system doesn't shut down when the  
> sensor stays open?

The system will only shutdown if you have an OB+LB event at the same  
time. As long as you make sure the system sees either OB or LB, but  
not both, you'll be fine.

> Can I just set SHUTDOWNCMD "" ?

This isn't needed.

Note that there is a fatal flaw in a setup where opening a contact  
triggers an event. You'll have no way to verify that there is not a  
short in your cable, short of raising the temperature periodically to  
see if you see something changing.

I wouldn't recommend using a temperature switch for anything else than  
a redundant over temperature kill switch, especially since USB  
connected temperature sensors are very cheap nowadays. This would  
allow you to monitor the health of your alarm system much easier.

Best regards, Arjen
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