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

[Arjen de Korte]

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

> So how do I make sure it never sees the LB event (or ignores it)?

By wiring you sensor so that it either sets OB or LB and hard wiring  
the other to the inactive state.

[...]

> The point about the short is a valid one, but I don't think it will  
> be an issue (if it ever does become an issue, I can change the  
> sensor out for a normally open one and change the driver file  
> accordingly)

This fails in a similar way - you have no way to determine if the  
sensor is not connected or if it is in the below limit temperature  
range. For an alarm system to be reasonably robust, you need to  
continuously monitor the health of your sensor and interconnect as well.

Best regards, Arjen
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