[aprssig] Parameter Names and Labels for Digital Telemetry Information

[Charles Bland]

The names for digital channels makes sense to me already..... Door1, Pump,
etc. But there are also 8 labels, but just 8. There aren't separate labels
for the bit states.

So, if I already have the names, what do the labeles, sent in a different
message, accomplish?

Chuck

On Thu, Oct 18, 2012 at 3:48 PM, Steve Noskowicz <noskosteve at yahoo.com>wrote:

>
> Thinking more...
>
> Say you have four door switches on your trailer and four window
> switches.  The labels could be this for your trailer telemetry:
>
> UNIT,...bla,bla,bla...Door1,Door2,Door3,Door4,Win1,Win2,Win3,Win4
>
> Since you can put anything you want it could also be:
>
> UNIT,...bla,bla,bla...Open1,Open2,Open3,Open4,Front,Rear,Back,Roof
>
> If you don't want anyone to know which is which, I suppose you could have :
>
> UNIT,...bla,bla,bla...Open,Open,Open,Open,Open,Open,Open,Open
>
>
> 73, Steve,
>
>
> I just looked into this.
>
> 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.
>
> Now we get to "What's in a name..." for the digital bits.
>   Call it a name or a lable, but it must tell what the digital bit
> represents in your situation.
> 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.
>
> Does that help?
>
>
> 73, Steve, K9DCI USN (Vet) MOT (Ret) Ham (Yet)
>
> --- On *Thu, 10/18/12, Charles Bland <root at blandranch.net>* wrote:
> Chapter 13 of the APRS spec goes into the detail of the parameter names.
>
>
> The PARM. message contains the analog and digital channels.
>
> The UNIT. message contains units for the analog channels and "labels" for
> the digital channels. This isn't clear to me.
>
> 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.
>
> Can anyone provide for clarity on this?
>
> Chuck Bland
> na6br
>
>
>
>
>
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