Nut upsuser - Jan 2019 - Just an interesting data point [CyberPower SNMP/USB]

On 1/27/19 9:49 PM, Charles Lepple wrote:
> You might be lucky with this particular model, but definitely beware of the
USB issues I mentioned in another thread:
> 
>
https://github.com/networkupstools/nut/issues?q=is%3Aissue+is%3Aopen+label%3A%22CyberPower+%28CPS%29%22
> 
> The output of upsc is sorted alphabetically by key, so it isn't
immediately obvious which values come from earlier in the report descriptor.
However, after the values for input.transfer.low and input.transfer.high, the
other values might end up being scaled to the transfer voltage range. Hence, I
would treat a lot of the values from usbhid-ups on CyberPower hardware
(including writable thresholds) as suspect. The USB HID report descriptors are
hierarchical, which enables cascading errors like these. We do have a debug
procedure that can get to the bottom of that if something comes up.
> 

Thanks, useful to know.  I'll have to keep a note of that in case
anything starts looking weird.

I'm not 100% certain I'm tracking what you mean by 'scaled to the
transfer voltage range' though.  Could you clarify?


-- 
  Phil Stracchino
  Babylon Communications
  phils at caerllewys.net
  phil at co.ordinate.org
  Landline: +1.603.293.8485
  Mobile:   +1.603.998.6958

On Jan 27, 2019, at 10:56 PM, Phil Stracchino <phils at caerllewys.net>
wrote:
> 
> I'm not 100% certain I'm tracking what you mean by 'scaled to
the
> transfer voltage range' though.  Could you clarify?
> 
The "output.voltage" column in the quoted portion at the link is
clipped/scaled to the range 136.0 to 142.0, which happens to be the range of
possible settings for the USB HID HighVoltageTransfer voltage (NUT variable:
input.transfer.high):

https://alioth-lists.debian.net/pipermail/nut-upsuser/2017-June/010685.html

On 1/28/19 9:10 AM, Charles Lepple wrote:
> On Jan 27, 2019, at 10:56 PM, Phil Stracchino <phils at
caerllewys.net> wrote:
>>
>> I'm not 100% certain I'm tracking what you mean by 'scaled
to the
>> transfer voltage range' though.  Could you clarify?
>>
> 
> The "output.voltage" column in the quoted portion at the link is
clipped/scaled to the range 136.0 to 142.0, which happens to be the range of
possible settings for the USB HID HighVoltageTransfer voltage (NUT variable:
input.transfer.high):
> 
> https://alioth-lists.debian.net/pipermail/nut-upsuser/2017-June/010685.html
> 

Aaaaah, now I understand.

I've seen no evidence of that happening so far.  Right now, input and
output voltage are both reported as 116.0 VAC.


-- 
  Phil Stracchino
  Babylon Communications
  phils at caerllewys.net
  phil at co.ordinate.org
  Landline: +1.603.293.8485
  Mobile:   +1.603.998.6958