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

Phil Stracchino phils at caerllewys.net
Mon Jan 28 03:56:00 GMT 2019

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

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