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RS-232

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PaulR

Joined: 13 Nov 2008
Posts: 22
Location: Alabama

Posted: Sun Feb 07, 2010 3:40 pm Post subject: RS-232

I'm wiring up my panel and was getting ready to hook the Dynon D-100 serial output to the GTX-327.  Reading the wiring diagram for the Garmin, it says to hook the TX wire from the Dynon to a certain pin.(I forgot which number) and that the RS-232 GND to either of two chassis grounds on the Garmin.  I take that to mean that the RS-232 gnd should be at the same potential as the rest of the 12V grounds and could be connected to the "forrest of tabs" where the balance of the grounds are hooked.



If that's true, then couldn't all the RS-232 gnds be connected there, along with their respective shields?

Am I thinking this through correctly?



Thanks

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_________________
Paul Rose
N417PR
RV-9A

nuckolls.bob(at)aeroelect
Guest

Posted: Sun Feb 07, 2010 6:00 pm Post subject: RS-232

At 05:40 PM 2/7/2010, you wrote:

 	  Quote: 	
		  



I'm wiring up my panel and was getting ready to hook the Dynon D-100 

serial output to the GTX-327.  Reading the wiring diagram for the 

Garmin, it says to hook the TX wire from the Dynon to a certain 

pin.(I forgot which number) and that the RS-232 GND to either of two 

chassis grounds on the Garmin.  I take that to mean that the RS-232 

gnd should be at the same potential as the rest of the 12V grounds 

and could be connected to the "forrest of tabs" where the balance of 

the grounds are hooked.



If that's true, then couldn't all the RS-232 gnds be connected 

there, along with their respective shields?


	


   SIGNAL grounds are different and sometimes separate of

   POWER grounds. The forest-of-tabs is for the grounding

   of electrical accessories. When it comes to wiring

   components of a radio, navigation or other electronics,

   follow the instructions. SIGNAL grounds are like the

   grounds for microphones, headsets, etc and are given

   specific treatment. See the documentation on the DIY

   audio isolation amplifier on my website for examples.



   Bob . . .

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