CPS: patch HID Report Descriptor to fix "output.voltage"

[clepple]

Observed in issue #337 (comment)
and on nut-upsuser.

Report ID 18 seems to be inheriting Logical Minimum/Logical Maximum from Report ID 16:

Collection(Physical)
    Report ID(16)
        Usage(LowVoltageTransfer)
        Logical Minimum(97)
        Logical Maximum(103)
        Feature(Data,Variable,Absolute)

        Usage(LowVoltageTransfer)
        Input(Constant,Variable,Absolute)

        Usage(HighVoltageTransfer)
        Logical Minimum(136)
        Logical Maximum(142)
        Feature(Data,Variable,Absolute)

        Usage(HighVoltageTransfer)
        Input(Constant,Variable,Absolute)

    Report ID(18)
        Usage(Voltage)
        Feature(Constant,Variable,Absolute)

        Report Size(8)
        Logical Minimum(0)
        Logical Maximum(255)
        Unit(SI Linear: ...)
        Unit Exponent(0)

I'm pretty sure this is not a bug in the NUT HID parser, but feel free to correct me. (There are other places in the CPS HID Report Descriptor that seem to mix up the locations of the parser tokens relative to Input/Output/Feature.)

[clepple]

Original HID Report Descriptor patcher issue is #169

[csurf]

what's the status of this issue? I'm experiencing the same thing for a CyberPower CP1000PFCLCD UPS. Both the output voltage & battery voltage are incorrect.

[CorvetteCole]

I would also love to hear if anyone has looked in to this further

[serfriz]

Any update on this? My CyberPower CP1500PFCLCD shows an output.voltage of 142.0

[arlenarlenarlen]

👋🏼 having the same issue here with my CP1500PFCLCD
Path: UPS.Output.Voltage, Type: Feature, ReportID: 0x12, Offset: 0, Size: 16, Value: 136

[slyticoon]

Having this issue with CP1500AVRLCD. Any updates or workarounds?

[ArcticZero]

Chiming in to say I'm experiencing the same with my CP1500EPFLCD. Output voltage shows a frightening 263.0-264.0v, but is actually 230ish volts. Hope there is some workaround for this for now.

  45.871994     Report[buf]: (3 bytes) => 12 e6 00
  45.872006     Path: UPS.Output.Voltage, Type: Feature, ReportID: 0x12, Offset: 0, Size: 16, Value: 262

[wmigas]

I have the same issue, with my CP1300EPFCLCD
I was comparing some value, it looks like output.voltage = input.voltage+32 in my case

input.voltage.nominal: 230
output.voltage: 265.0

input.voltage.nominal: 230
output.voltage: 266.0

when I run /lib/nut/usbhid-ups -DDD -a cyberpower1500
I get one value which match 32. It is Path: UPS.ff0100ba.ff0100bc
see Path: UPS.ff0100ba.ff0100bc, Type: Feature, ReportID: 0x1c, Offset: 16, Size: 8, Value: 32```
can some one check if value reported by Path: UPS.ff0100ba.ff0100bc match diff between display output voltage and value reported by NUT?

[spootle]

@wmigas I have a CP1500EPFCLCD - it's not always input + 32, sometimes it drops to a hard 260v

e: the lowest input.voltage i've ever recorded (other than when unplugged) is 225 and output.voltage didn't drop below 260 then either so it seems to have that as a min (here's a screenshot of both random drops to 260 and a spot where it's +32 right until that would drop it below 260