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<DIV>Thinking more...</DIV>
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<DIV>Say you have four door switches on your trailer and four window switches. The labels could be this for your trailer telemetry:</DIV>
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<DIV>UNIT</FONT></FONT><FONT size=2 face=CourierNew><FONT size=2 face=CourierNew>,...bla,bla,bla...Door1,Door2,Door3,Door4,Win1,Win2,Win3,Win4</FONT></FONT></DIV>
<DIV><FONT size=2 face=CourierNew><FONT size=2 face=CourierNew></FONT></FONT> </DIV>
<DIV><FONT size=2 face=CourierNew><FONT size=2 face=CourierNew>Since you can put anything you want it could also be:</FONT></FONT></DIV>
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<DIV><FONT size=2 face=CourierNew><FONT size=2 face=CourierNew>UNIT<FONT size=2 face=CourierNew><FONT size=2 face=CourierNew>,...bla,bla,bla...Open1,Open2,Open3,Open4,Front,Rear,Back,Roof</FONT></FONT></FONT></FONT></DIV>
<DIV><FONT size=2 face=CourierNew><FONT size=2 face=CourierNew></FONT></FONT> </DIV>
<DIV><FONT size=2 face=CourierNew><FONT size=2 face=CourierNew>If you don't want anyone to know which is which, I suppose you could have :</FONT></FONT></DIV>
<DIV><FONT size=2 face=CourierNew><FONT size=2 face=CourierNew></FONT></FONT> </DIV>
<DIV>UNIT<FONT size=2 face=CourierNew><FONT size=2 face=CourierNew>,...bla,bla,bla...Open,Open,Open,Open,Open,Open,Open,Open</FONT></FONT></DIV>
<DIV><FONT size=2 face=CourierNew><FONT size=2 face=CourierNew> </DIV>
<DIV></FONT></FONT><BR>73, Steve, <BR></DIV>
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<DIV>I just looked into this.</DIV>
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<DIV>Units should be obvious for the analog quantities. This specifies the units of measure - the units of these quantities. Things like volts, Degrees F, Degrees C, or Degrees K -- seconds, or minutes, or days. If it was money, it could be dollars, pounds, or Yen. These can also be scaled by making the units volts/100 for large values or volts*100, or perhaps mv (milivolts) for small values.</DIV>
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<DIV>Now we get to "What's in a name..." for the digital bits.</DIV>
<DIV> Call it a name or a lable, but it must tell what the digital bit represents in your situation. </DIV>
<DIV>The digital labels will indicate the function of each bit. What is it representing. These will be only 1 or zero but the labels tell you what they indicate. They are for things like a door open or closed; a switch open or closed; a shutter button pushed down or notl; a motor running or not. </DIV>
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<DIV>Does that help?</DIV>
<DIV> <BR><BR>73, Steve, K9DCI USN (Vet) MOT (Ret) Ham (Yet)<BR><BR>--- On <B>Thu, 10/18/12, Charles Bland <I><root@blandranch.net></I></B> wrote:<BR>Chapter 13 of the APRS spec goes into the detail of the parameter names.</DIV>
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<DIV>The PARM. message contains the analog and digital channels.</DIV>
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<DIV>The UNIT. message contains units for the analog channels and "labels" for the digital channels. This isn't clear to me.</DIV>
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<DIV>Regarding the digital channels, what is the difference between a "name" and a "label"? I see the message examples in the spec, but I really don't see an application for the labels.</DIV>
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<DIV>Can anyone provide for clarity on this?</DIV>
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<DIV>Chuck Bland</DIV>
<DIV>na6br</DIV>
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