[Nut-upsuser] Contact closure UPS?

Humberto Möckel hamberthm at gmail.com
Mon Apr 27 20:42:51 UTC 2015

Nevermind, i'll reply to myself: I made a Megatec M2501 for the RUPS 2000
specification and it worked flawlessly with GENERICUPS driver and
upstype=21 (RUPS 2000). COM port state changes with OL/OB states as

M2501 cable diagram can be found here: http://www.junradio.com/mid/UPS.htm
(Sendon UPS-500 cable)

The only thing that doesn't work in this UPS  is the UPS shutdown option.
As you saw on the picture I posted in my previous message, only pins 2, 4
and 5 are used by this UPS, which means it only supports OL and OB event
notifications, leaving pin 6 out of use (shutdown pin in RUPS standard).

So, now I have another UPS working on NUT. THANK YOU GUYS!!!

On Sun, Apr 26, 2015 at 11:49 PM, Humberto Möckel <hamberthm at gmail.com>

> Hello again! I'm yet again the guy from the blazer_usb problem  and the
> ATCL one too. This time I have a third UPS (the last one In my collection)
> that i'm trying to make work instead of the ATCL one since there's no
> driver for it on windows.
> This UPS is another no-brand box (actually it is a "kozumi", but that's
> just a rebrand), and apparently it's much more basic than the others. It
> has only an RS232 port on the back, and I need help finding out what
> interface it uses. The chips inside are just voltage comparators and
> doesn't seem to have a proper "serial" data interface, it only has a small
> board containing a pair of opto couplers going to the DB9 plug.
> You can see pictures of the output board here (onedrive):
> http://1drv.ms/1A3ryEp
> http://1drv.ms/1A3ryEp
> The only pins used seems to be 2, 4 and 5. ¿Is it a RUPS interface? ¿What
> cable pinout do I need to build?
> Thanks!!!
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