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NMEA out question

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pbesing(at)yahoo.com
Guest

Posted: Sat Jun 24, 2006 2:49 pm Post subject: NMEA out question

I've got a Garmin 396 and I'm hooking up my Trio.  The

Trio calls for a "signal ground" and the Serial input.

 My GPS only has an output but no signal ground.  



Is a "signal ground" the same thing as an airframe

ground?  The diagram has two types of grounds, but the

way it is drawn assumes the GPS has a ground and a

serial output.



Paul Besing



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pitts_pilot(at)bellsouth.
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Posted: Sat Jun 24, 2006 3:26 pm Post subject: NMEA out question

Paul Besing wrote:



 	  Quote: 	
		  



I've got a Garmin 396 and I'm hooking up my Trio.  The

Trio calls for a "signal ground" and the Serial input.

 My GPS only has an output but no signal ground.  



Is a "signal ground" the same thing as an airframe

ground?  The diagram has two types of grounds, but the

way it is drawn assumes the GPS has a ground and a

serial output.



Paul Besing



Grounds (and grounding) can really be confusing.  Sometimes, chassis 
	


ground (or airframe ground) and signal ground are the same ....... 

internally to the device.  However, some communications pairs are 

floating above ground ...... and are usually designated OUT+ and OUT- 

 (or IN+ and IN- etc.) ...... or something showing some polarity. 

 That's not to say that out- isn't the same as GND, CHASSIS GROUND, or 

 SIGNAL GROUND.



Having said all that, if you only have one wire and it's labelled SERIAL 

OUT, you can be assured that the airframe ground is the same as SIGNAL 

GROUND.



It's the little subtle things like this that make wiring your own panel 

something of a nightmare. I'd peruse the Aeroelectric web site and their 

lists for electrical stuff.

Linn

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stein(at)steinair.com
Guest

Posted: Sat Jun 24, 2006 6:11 pm Post subject: NMEA out question

Hi Paul,



In cases like the one below, just ignore it (the ground that is)...it'll

work just fine. Some GPS's run RS-232's in pairs with a ground along each

RS-232 signal, but most handhelds do not.  If you're using one of our

plug/play harnesses there should only be one wire for the GPS...just hook

that one up.  Just an FYI, but when hooking tranponders to EFIS's like

Dynon's and GRT's you'll likely see the same issue - and use the same

method.



Cheers,

Stein.

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