[Nut-upsuser] Unsupported UPS Orvaldi 520PL?

[Charles Lepple]

On Aug 27, 2011, at 2:57 AM, Milan Knížek wrote:

> Hello Arnaud
>
> V Fri, 26 Aug 2011 16:06:05 +0200
> Arnaud Quette <aquette.dev at gmail.com> napsáno:
>>
>> as per link [4], this is a dry contact UPS.
>> so you need to use genericups
>
> Thanks for the hint, I tried to find the proper upstype as per
> genericups man page and also define own CP, OL, LB, SD.
>
> However, the ups.status (as provided by upsc while upsd was running)  
> has
> always remained the same and did not change on UPS status change (AC
> on, AC fail), no matter what variants of CP & OL I tried.
>
> So I got to a bit lower level debugging: I measured the pins on UPS'
> RS232 with voltmeter (every pin against the ground pin as per [4]),
> especially 4 <-> 2 for AC status, but never got any voltage.
>
> I am no electrician: is it reasonable to expect that the UPS should
> provide High/Low voltages on the appropriate pin pairs even without
> having any cable power signal from the computer?

"dry contact" means that the UPS does not supply voltage to the pins;  
rather, it closes and opens relay contacts. You can check the contacts  
with the meter set to measure resistance (or on a continuity setting).