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GPS Serial Data to Garmin GTX-327 Transponder

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Matt Dralle
Site Admin

Joined: 08 Nov 2005
Posts: 26321
Location: Livermore CA USA

Posted: Fri Jan 02, 2009 10:45 am Post subject: GPS Serial Data to Garmin GTX-327 Transponder

Listers,



I've tried sending two different sources of NMEA 0183 data at 4800/9600/19200/38400/57600 baud rates to my Garmin GTX-327 on both serial input ports 1 (db25 Pin 2) and port 2 (db25 pin 19), and configured for "GPS" input.  But I don't get anything on the GTX-327 serial input test display.  I have been successful at getting AirData Z-format from the GRT EFIS at 9600 baud into either of the GTX-327 serial ports, so the ports are good.  The NMEA 0183 data registers correctly on other devices reading it so the GPS serial output seem fine.  The GTX-327 just won't seem to see the GPS data for some reason.



Am I doing something wrong?  Has anyone else tried this successfully?



Thanks!



Matt Dralle

RV-8 #82880 N998RV

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Matt Dralle
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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Fri Jan 02, 2009 1:13 pm Post subject: GPS Serial Data to Garmin GTX-327 Transponder

Why would you send GPS data to a Mode A/C transponder? It only transmits 

a reply with altitude data from encoder. Just wondering if there is some 

feature to the GTX327 that is unique besides acting as a backup up 

altimeter and timer? Guess I am clueless about what you are trying to do.



Matt Dralle wrote:

 	  Quote: 	
		   

 Listers,



 I've tried sending two different sources of NMEA 0183 data at 4800/9600/19200/38400/57600 baud rates to my Garmin GTX-327 on both serial input ports 1 (db25 Pin 2) and port 2 (db25 pin 19), and configured for "GPS" input.  But I don't get anything on the GTX-327 serial input test display.  I have been successful at getting AirData Z-format from the GRT EFIS at 9600 baud into either of the GTX-327 serial ports, so the ports are good.  The NMEA 0183 data registers correctly on other devices reading it so the GPS serial output seem fine.  The GTX-327 just won't seem to see the GPS data for some reason.



 Am I doing something wrong?  Has anyone else tried this successfully?



 Thanks!



 Matt Dralle

 RV-8 #82880 N998RV

- The Matronics RV-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

stein(at)steinair.com
Guest

Posted: Fri Jan 02, 2009 2:54 pm Post subject: GPS Serial Data to Garmin GTX-327 Transponder

Because you can have the Txpdr automatically go from STBY into ALT and back

to STBY when it has a GPS signal to it...which is what I missed in Matt's

first post (Sorry Matt - I thought you were only looking for the AltEnc

data, not the GPS data).  I don't know as you'll see anything in test mode

though, even if it is hooked up right.



So, in your setup you should have a line running from the GRT to the Txpdr

RS-232 channel for AltEnc data and another line RS-232 line for GPS

data....sorry about the missed replay earlier!



Cheers,

Stein



[quote]--

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