Voltage override in megatec and megatec-over-usb [was: Re: [Nut-upsdev] nut-2.0.5 megatec + Online Xanto]

[Henning Brauer]

* Carlos Rodrigues <carlos.efr at mail.telepac.pt> [2007-01-23 01:58]:
> On 1/23/07, Henning Brauer <hb-nut at bsws.de> wrote:
> >good new first: the megatec driverin 2.0.5 now works with the Online
> >Xanto S3000R here - well, for the very basics.
> >
> >the UPS has NO way ofidentifying itself. It also does not respond to
> >the power ratings query ("F"). I previously used a hacked up fentonups
> >driver. This means the driver cannot figure out the battery voltage and
> >thus no battery charge level, which is a problem in our setup.
> 
> You have to remember that the charge calculation in megatec is very
> crude. The fact that it drops abruptly when the UPS goes on battery is
> the most evident symptom. And there isn't any way around this. Not any
> feasible one, that is.
> 
> So, if you are depending on the charge value for something important,
> think twice about it.

I only really care about a rough guess.
heck, most of the time I really only care about "about full" and "not" 
:)

> >it is a 96V unit. the values I had in fentonups.h were
> >+       { "XS3000R", "Online", "Xanto S3000R",
> >+               1.81, 0.44, 1.81, 0.44, 165, 200, 240, 275, 1 },
> >if there were a way to give the driver the desired voltage overriding
> >the auto-detection, everything would work fine again...I had this
> >hacked up for 2.0.3 at one point, but can't fine it right now. Carlos,
> >didn't I mail hat before? in any case. does anyone have a better idea
> >to solve this?
> 
> The version in the trunk has an option to do this ("battvolts=XX:XX")
> since yesterday.You can get megatec.c and drop it over the 2.0.5
> sources, it should build just fine.

thatis excellent news.

> It isn't in 2.0.5 because I didn't want to do it unless I was sure
> there was no other way, and an option in a stable version is an option
> that people may start using and thus can't be removed easily later on.
> But my Mustek PowerMust broke, and I got a PowerWalker model that
> looks just like the old one (software-wise, that is) but where the
> charge gets calculated wrong. Talk about cheap hardware...

I refrained from buying more UPSes from Online for a reason too :)

> BTW, this model has an USB port along the RS232 one. So... I can help
> if the project to create a "usbserial.o" communications layer picks
> up. (If it doesn't, I will think about doing it on my own, based on
> the code posted here a while ago, but I promise nothing. My time is
> currently in short supply and I'm a complete newbie to this USB
> protocol stuff.)

don't have any USB units (and the sun ultra1 used for UPS monitoring 
here doesn't have usb either)

-- 
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