HI I will have access to many cyberpower 800E units just when they deliver them. Also I may need access to a voltmeter that can log to a file so we can let battery discharge and compare upsc with the voltmeter readings. from there we can curve fit to get scale/offset or even do the nonlinear calibration if the values are really odd. Currently I can only tell that reading of 21.3 corresponds to 13.7V at battery terminals
No problem I'll try -DDDDD if I can find out something indicative Best regards, Davor On 4/2/08, Arjen de Korte <[EMAIL PROTECTED]> wrote: > > I think the firmware is broken as it didn't apply correction > > factor/offset to get volts in the HID diescriptors. > > In that case, there is little we can do, unless we have a way to find the > correct coefficients and also are sure that these are applicable for *all* > devices that use the same VendorID and ProductID. Unless you're working > for CyberPower or have access to many units, I doubt we can find out > either of those. > > > I haven't scanned the protocol - but *I think* in the HID > > report descriptors contains fields for measured value of > > the battery voltage and the physical unit (V, mV) that > > describes the value. Unit can be a physical unit but also > > some undimensioned value (that may need correction > > factor and offset) > > We use all the above in the logical to physical conversion. Since the > reported value has a decimal, I'm certain that the HID descriptor contains > the fields needed to do this, but apparently they are wrong. > > > I wonder is the cyberpower really outputting volts wrong > > or does it report an undimensioned value which in the > > upsc gets interpreted as volts although it is not true volt > > measure report > > The 'upsc' client doesn't interpret anything, it reports the values from > the 'upsd' server ad verbatim. It is the 'usbhid-ups' driver that is doing > the grunt work of converting from logical to physical values. You can look > quite detailed what is going on by running the 'usbhid-ups' driver with > the additional debugging flags '-DDDDD'. It will report all the > information it reads from the UPS on the console then (until you stop it). > Note that at this debuglevel it will be very verbose, so you may wish to > capture this to a logfile before examining it. > > Best regards, Arjen > > _______________________________________________ Nut-upsuser mailing list [email protected] http://lists.alioth.debian.org/mailman/listinfo/nut-upsuser
