[Nut-upsuser] APC CS650 not turning load back on when powerreturn

Doug Parsons doug at parsonsemail.com
Wed Oct 6 01:47:51 UTC 2010

Just to throw in a couple of comments but no direct knowledge:

As for restoring immediately I believe the battery level has some effect on 

Determining the command is a little more tricky. The best way to do this is 
to sniff the connection since the manufacture does not make the commands 
available. And to do this you need the UPS. So, since you have the UPS, if 
you can hook the UPS back up to the Windows box. Run it with a sniffer on 
the USB connection. Then see what commands are being sent, so that can be 
compared to what NUT is actually sending.

Haven't actually done this on USB myself but there appears to be a selection 
of free sniffers out there. There is one that has a fully functional 33 day 
trial that work on any 32 bit Windows, usblyzer. Search Google for: windows 
usb sniffer.


----- Original Message ----- 
From: "Andy Hawkins" <andy at gently.org.uk>
To: <nut-upsuser at lists.alioth.debian.org>
Sent: Tuesday, October 05, 2010 3:32 PM
Subject: Re: [Nut-upsuser] APC CS650 not turning load back on when 

> Hi all,
> In article <slrniacdg3.o7l.andy at atom.gently.org.uk>,
>           Andy Hawkins<andy at gently.org.uk> wrote:
>> A bit more info. I have been in touch with the people at apc-forums just 
>> to
>> make sure this isn't a UPS fault. They had me try the Powerchute software
>> under Windows to see if it behaves in the same way.
>> Using this software, the power to the load is restored once power to the 
>> UPS
>> comes back (although it happens immediately rather than once the battery 
>> has
>> charged a little as I'd expected).
>> So it appears that the command NUT is sending to shutdown the load power
>> from the UPS also prevents it from re-applying the load power once power 
>> to
>> the UPS returns.
>> Does this help?
> Anyone got any ideas on this?
> Cheers
> Andy
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> Nut-upsuser at lists.alioth.debian.org
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