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08-14-2012, 10:02 PM
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Join Date: Mar 2005
Posts: 75
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Steve, here is a suggestion for those of us that cannot physically test the NMEA output on the orange wire--serial ports on computers are very rare these days, plus I own a macbook! On the WX>Info page for the GDL 39, you could put a line there to indicate whether data is being transmitted on the orange wire. That would make diagnosis for this difficult issue that much easier. Just a thought.
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08-15-2012, 02:33 AM
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Join Date: Feb 2006
Location: Forest Grove, OR
Posts: 239
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Still not working
Steve,
I spent a couple more hours on this tonight with no luck. I rechecked wiring and removed connectors from all devices except Trio autopilot. Still no signal on wires that used to connect to 696. I have toggle switch to select whether 696 or 430W drives autopilot. The 430W still operates it fine. Although, as you probably know, you have to have a waypoint entered in 430W to provide valid signal for autopilot to work. That was never the case with the 696 before. Perhaps GDL is missing the same data the 430W doesn't have when no waypoint selected. Just a thought. I tried 696 with and without waypoint but it didn't matter. I also tried normal and fast baud.
I'll be at Garmin Salem factory tomorrow afternoon. Any chance they'd have one that works on bench to swap as test.
Thanks,
Mark
__________________
Mark - Forest Grove, OR (Homebase KHIO)
Flying RV-9A N962MC
EAA Tech Advisor - Ham AI7MC
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08-15-2012, 02:41 AM
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Join Date: Feb 2006
Location: Forest Grove, OR
Posts: 239
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Steve,
By the way, there's a typo in the manual if you didn't already know. The A & B port labels are reversed on the pass through wiring diagram compared to the previous page. The wire colors are still okay though.
__________________
Mark - Forest Grove, OR (Homebase KHIO)
Flying RV-9A N962MC
EAA Tech Advisor - Ham AI7MC
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08-15-2012, 05:03 AM
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Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,167
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Probably unrelated but I thought I would mention something with the 696 that can be a issue.
When you select TIS in and NMEA out you also get VHF out on the 696. VHF out requires 9600 baud so regardless of what you have set prior in the NMEA out mode the garmin unit shifts to 9600 baud for NMEA out also. You can not change this output as long as you have TIS in selected. The baud is not user selectable however appears to be. Resetting the TruTrac autopilot for 9600 baud in my case fixed the issue I was having with the autopilot losing the signal after I added traffic to the 696 display.
George
Last edited by sailvi767 : 08-15-2012 at 05:10 AM.
Reason: clarity
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08-15-2012, 04:07 PM
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Join Date: Sep 2010
Location: Olathe, KS
Posts: 2,885
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We tested a GPSMAP 696 bare wire setup this morning using V6.10 software with several GDL39 units using both V2.20 and V2.30 software. The goal of this testing was to identify any conditions which might impact supplying data to external devices.
While we have not been able to consistently reproduce a problem with the GDL39 serial output, we have seen cases where the output is incorrect. We have also noted that the problem occurs more frequently when using the Normal setting than with the Fast setting. We have never observed a case where there was no data being output.
We have not completed this investigation, but we wanted to assure our customers that we are making some progress and will do everything possible to resolve any identified issues quickly.
It is important to understand that only the GPSMAP 69X and Aera 5XX products use this port forwarding feature of the GDL39. G3X, GDU 37X and Aera 7XX installations are NOT impacted. Only those GPSMAP 69X and Aera 5XX installations which rely on the port forwarding feature of the GDL39 to supply data to external devices are potentially impacted.
In all cases, the traffic and weather features provided by the GDL39 are working as designed.
We appreciate your patience and help in resolving this issue.
Thanks,
Steve
__________________
Garmin G3X Support
g3xpert@garmin.com
1-866-854-8433 - 7 to 7 Central Time M to F
Please email us for support instead of using Private Messaging due to the limitations of the latter.
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08-15-2012, 04:43 PM
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Join Date: Feb 2006
Location: Forest Grove, OR
Posts: 239
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Steve,
Thanks for your continued help with this. In my case the Trio autopilot manual indicates that it accepts either NMEA 0183, V2.XX stream format or Aviation Link format. Perhaps that is standard but I thought I'd throw that out there in case it is unique to Trio. And to correct what I said previously, I don't actually know if I have data out or not, as I don't have any way to view that. The autopilot simply doesn't recognize it. I did upgrade the GDL firmware to the latest version last night as well with no change. That is really cool how you can update the firmware using the iPhone though.
Otherwise I'm very happy with the performance of the GDL. With an external antenna at 3000 feet near PDX I'm getting (7) ground stations and up to 190 miles away. I'm sure it would be even better if I went higher. The external antenna really works great as I am getting twice the stations of a friend with the unit mounted antenna inside the airplane.
__________________
Mark - Forest Grove, OR (Homebase KHIO)
Flying RV-9A N962MC
EAA Tech Advisor - Ham AI7MC
Last edited by mcattell : 08-15-2012 at 04:49 PM.
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08-16-2012, 10:55 AM
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Join Date: Sep 2010
Location: Olathe, KS
Posts: 2,885
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Quote:
Originally Posted by g3xpert
We tested a GPSMAP 696 bare wire setup this morning using V6.10 software with several GDL39 units using both V2.20 and V2.30 software. The goal of this testing was to identify any conditions which might impact supplying data to external devices.
While we have not been able to consistently reproduce a problem with the GDL39 serial output, we have seen cases where the output is incorrect. We have also noted that the problem occurs more frequently when using the Normal setting than with the Fast setting. We have never observed a case where there was no data being output.
We have not completed this investigation, but we wanted to assure our customers that we are making some progress and will do everything possible to resolve any identified issues quickly.
It is important to understand that only the GPSMAP 69X and Aera 5XX products use this port forwarding feature of the GDL39. G3X, GDU 37X and Aera 7XX installations are NOT impacted. Only those GPSMAP 69X and Aera 5XX installations which rely on the port forwarding feature of the GDL39 to supply data to external devices are potentially impacted.
In all cases, the traffic and weather features provided by the GDL39 are working as designed.
We appreciate your patience and help in resolving this issue.
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We have some additional information to share regarding our investigation of this issue.
We have identified that data coupling can occur, in some cases, between the Port A and Port B wire pairs in the 60 inch long GDL39 bare wire cable. Since the Port B orange/white wire is currently unused and floating in most installations, it is susceptible to coupling noise into the Port B receiver which appears to be the source of the problem.
We may eventually make software changes to make the system more tolerant of this type of installation, but for now we recommend that anyone using the bare wire cable ground the orange/white wire to the black ground wire (which should already be grounded).
We also recommend that the NMEA Out setting on the GPSMAP 69X and Aera 5XX (these are the only devices which use port forwarding) be set to FAST, not NORMAL.
Please send us an email if you have any questions.
Thanks,
Steve
__________________
Garmin G3X Support
g3xpert@garmin.com
1-866-854-8433 - 7 to 7 Central Time M to F
Please email us for support instead of using Private Messaging due to the limitations of the latter.
Last edited by g3xpert : 08-16-2012 at 11:00 AM.
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08-16-2012, 01:39 PM
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Join Date: Mar 2005
Posts: 75
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Steve, I connected the white/orange wire to ground and still no luck in getting the Trutrak autopilot to work. Weather, however, still remains great. Let's hope to hear if Mark and his Trio AP had any luck.
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08-16-2012, 01:56 PM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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Just an FYI, on the Dynon systems, the NMEA needs to be set to normal. Fast leaves something out that Dynon needs.
Not sure if this applies to TT or Trio.
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08-16-2012, 02:05 PM
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Join Date: Sep 2010
Location: Olathe, KS
Posts: 2,885
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Quote:
Originally Posted by pboyce
Steve, I connected the white/orange wire to ground and still no luck in getting the Trutrak autopilot to work. Weather, however, still remains great. Let's hope to hear if Mark and his Trio AP had any luck.
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Hello Pboyce,
You probably already checked this, but is the autopilot listening at 4800 baud?
If we need to I can capture an output file and provide it to TT to evaluate, but the data should be the same data that your 696 was transmitting before the GDL39 was connected.
Thanks,
Steve
__________________
Garmin G3X Support
g3xpert@garmin.com
1-866-854-8433 - 7 to 7 Central Time M to F
Please email us for support instead of using Private Messaging due to the limitations of the latter.
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