Garmin GTR 225 Radio Skyview
 

Finally getting to the end of one of the longest RV 12 builds on record. At the stage where everything appears to go wrong.
RV 12 with the early Skyview conversion harnesses. GTR 225 radio. Everything appears to be connected and the settings in Skyview verified. Still have big red cross on the Skyview screen where the radio frequencies should be.
Have checked everything I can think of. What am I missing?? Any help suggestions from the experts out there appreciated.

No expert, but the Garmin radio communicates with Skyview via a serial port. Have you checked the serial ports setup menu to see if the GTR 225 is specified on one of the ports?

And I believe, it's port 4 ? Also, was your wiring harness built with the shielded data cable that goes from the box to GTR225 ? Also make sure the baud rate is set correctly.

I know, having an early RV-12 and box, for my SL-40, I had to buy an additional separate shielded cable from Van's to get that information to show up at the top of my Map, as it was not included in the original wiring harness, but was subsequently added later on, in production. You could probably make your own cable, later on, folks said the shielding wasn't necessary, just need the pins, and pinout locations.

Tony,
"No expert, but the Garmin radio communicates with Skyview via a serial port. Have you checked the serial ports setup menu to see if the GTR 225 is specified on one of the ports?"

From the Dynon Skyview Manual the following options selected:
Configure the serial port: SETUP MENU > SYSTEM SETUP > SERIAL PORT SETUP > SERIAL
PORT x SETUP > SERIAL IN DEVICE > (Configured for Serial Port 4)
FUNKE ATR833 or
GARMIN GTR 200 or
Full TY91/92 8.33 kHz support depends on a future software update from Trig.
SV-D700 / SV-D1000 / SV-D1000T Installation and Configuration
SkyView System Installation Guide – Revision W 4-23
GARMIN GNC 255 A/B or
GARMIN GTR 225 A/B or (This radio selected)
TRIG TY9X 25KHz ONLY
TRIG TY9X 8.33/25KHz
This will automatically set the SERIAL IN FUNCTION, SERIAL IN/OUT BAUD RATE, and SERIAL
OUT DEVICE.
Set the radio status to be displayed on the top bar: SETUP > SYSTEM SETUP > DISPLAYED COM >
(device you chose above) (PORT x) (“DISPLAYED COM” does NOT appear as an option. It has a setting for “PRIMARY COM” which shows GARMIN GTR 225 A/B selected on Serial Port 4)
and
SETUP MENU > SYSTEM SETUP > DISPLAY COM IN TOP BAR: YES (This option selected)

Still searching:)

Niner Bikes,
And I believe, it's either port 3 or port 4 ? And is Baud rate correct. Also, was your wiring harness built with the shielded data cable that goes from the box to GTR225 ? Also make sure the baud rate is set correctly.

I know, having an early RV-12 and box, for my SL-40, I had to buy an additional separate shielded cable from Van's to get that information to show up at the top of my Map, as it was not included in the original wiring harness, but was subsequently added later on, in production. You could probably make your own cable, later on, folks said the shielding wasn't necessary, just need the pins, and pinout locations.

Per previous reply to Tony, radio set up on serial port 4. Radio was supplied with the mounting tray and harness by Vans, admittedly some time ago. I suppose it is possible harness has been modified through experience, will also contact Vans.

One other thought; have you loaded a .dfg Van's settings file for the GTR225? Your USB stick containing your downloaded Van's EFIS software and settings files should contain a file that looks like this or similar:
12-GTR225-PRE-
SETS_0...2-15.dfg

You would have loaded this during your initial setup of the SV, but I thought I would ask.

My download did not include a .dfg for the GTR225, only one for the GTR200. If you don't have it you may have to ask Van's for it.

You did not mention if you were seeing any activity on the port monitor TX and RX counters for serial port 4.

You may want to check your GTR225 Serial Port IO MODE on the System Configuration menu, it should be set to NMEA (the default setting is 'NONE').

If you have a PC/Laptop with a RS232 serial port you can use a HyperTeminal program to see if the GTR225 is sending the data to pin 9 of the SV D37 connector. The GTR is set for 9600, 8, 1, None and you should be able to see the NMEA 0183 string on pin 9 if the wiring is correct.

John Salak
RV12 N896HS

Software Updates
 

Part of my problem could possibly be Software Status. The radio as supplied by Vans has Software Version:
Display 2.01
COM 2.11
Latest Versions I can find (Garmin Bulletin Oct 12 2017) are:
Display 2.20
COM 2.30
It would appear I'm a tad behind the times. Update I thought. Well whilst the GTR 200 series update is available on the Garmin site, for the GTR 225 series you get:
Software Information Currently Unavailable
This information is either coming soon, not applicable, or no longer available for this product.
As this is a current radio (still supplied as one option for the 12IS) does anyone know how you update the GTR 225A ???

The original wiring harness on mine (2013 SLSA) didn't come with the RS-232 wire out from the comm radio to the Skyview. Was easy to add, if you like adding wires.

Skyview to GTR 225 Issue Fixed
 

Comment made by John Salak post #7 spot on:

"You may want to check your GTR225 Serial Port IO MODE on the System Configuration menu, it should be set to NMEA (the default setting is 'NONE')."

Changed setting and all is well.

Thanks for the tip.

Jim D