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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>The syntax is beginning (just beginning) to make sense to me now, so I’m looking now to try and implement just a few items in the report descriptor, and then I figured I can progress from there if all goes well. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>The power HID docs seem to encourage drawing out your system first, and then letting the report descriptor flow from there. So, my very simplified system goes like this:<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>[Battery]===DC Flow </span><span style='font-family:Wingdings;color:#1F497D'>è</span><span style='color:#1F497D'>[Power Summary]<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>All of the drawings seem to end in a power summary, and the doc seemed to stress that it was essential to power management software being able to effectively use it, so I’ll include it.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I think I understand how the usages work now….they’re basically like establishing the namespace (like com.java.class, etc). I had been confused before when I would see multiple usage() statements all following each other, but seeing it in the nut output as the path makes it more clear.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>So, pretty much everything should be under the UPS usage. Then I would define things under the battery usage, then the flow usage, and then the power summary usage…right?<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Where I’m still foggy is two things….first collections. I’m pretty sure there’s supposed to be an application collection, and then I usually see a physical collection, but I’m still not completely understanding what their purpose is.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>The second thing I still don’t understand is the minimum/maximum descriptors. Ok, Logical min/max I get…that’s just the range of the actual value in the report…basically a way to indicate if it is unsigned or signed. If you only have an 8 bit value specified, then I’d guess you can’t have a logical max greater than 255. But physical min/max are a bit confusing. Is it just a means of scaling or offsetting the logical value? <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>So, for instance temperature. Our UPS has a temperature monitor on it, but HID temperature values are in Kelvin. I could define an 8-bit temperature field, with a logical min/max of 0/100, and a physical min/max of 273/373. So if I pass 50 as a value, then it gets read as 323 on the PC side? And if the physical range is much greater than the logical range, then it just scales it?<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>The other min/max I don’t quite understand is usage min/max. I’m thinking they have something to do with the usages “OutputID”, “FlowID”, etc.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Thank you for the help so far. I really wish there were better learning docs out there for the un-initiated.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Rob<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p></div></body></html>