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  #1  
Old 09-21-2022, 01:31 PM
Frogman208 Frogman208 is offline
 
Join Date: Nov 2014
Location: San Diego,ca
Posts: 73
Default Dynon Skyview and Trig TX56 integration

Hi Vanation,

So I thought I’d give some feedback on the new Trig TX56A COM/NAV radio integration with the Dynon Skyview. I’ve seen a few posts within various forums asking the questions on compatibility and installation so below are my thoughts and minor issues that I’m trying to figure out. The Trig replaced my 1 year old, trusted second radio Garmin 200. The replacement only took us about 4 hrs to complete which included installing the Archer Antenna in the wing tip. Actually, probably the hardest part was running the RG400 cable through the wing and center section. The form and fit was almost identical to the Garmin 200 (size and weight), so swapping trays was relatively easy, no cutting panel like I would have had to do if I went with the Garmin 255. I was already using the Dynon Serial Port #3 for the Garmin 200, so the wiring was relatively easy on the Comm side but had to build a harness for the Nav side and connect to Port #3. Basically the form, fit and wiring is extremely easy as far as integrating into the Dynon Skyview. Lets talk about compatibility. The Trig understands the Garmin SL-30 “AND” Gamin 255 A/B protocols, so in Dynon skyview port (in my case) #3, I chose the Garmin 255 A/B protocol ($PGRMC and $PGRMV) which set the speed at 9600 bps and immediately the Trig started talking to the Dynon. Next is the CDI configuration that must be set up. Trig has a sub menu that you go into and push the “type” of CDI you would like. The choices are Converter, Resolver, Serial and Internal. When the Trig is talking to an external EFIS, the serial is the choice you are supposed to use, same function in the SL-30 when you chose CDI choice-“none”. So now I dial in the VOT testing frequency (we have one at the airfield), and the CDI comes up- GREAT- but if I stop turning the knob, the skyview CDI disappears. Ok, that doesn’t work correctly, so I double check all settings and even change protocol in Port #3 to SL-30 ($PMRRC and $PMRRV) but still no change to the skyview CDI needle. It will appear if I spin the knob but disappear if not actively turning the knob. So this is what I currently had to do for it to work appropriately. Like I said earlier, in the Trig sub section, you can choose Converter, Resolver, Serial or Internal. When I choose “INTERNAL”, the Dynon Skyview CDI works accordingly with a few caveats.

The skyview CDI needle WILL NOT come up if you dial in NAV frequency on the Trig, you get the ID (voice and automatic) BUT YOU HAVE TO HIT THE OBS button on the TRIG. This activates your Skyview CDI for the rest of the flight. You can change freqs, go from VOR to ILS. You can turn the CRS knob on the Dynon or Trig as both work. You can also monitor the standby Nav FREQ on the TRIG and it will get you the standby bearing. I wish that part showed up on the Dynon ‘bearing bugs’ since it is showing “NAV stby” as a Nav source but so far I cant get that to work. With all that said, it tracks VOR’s, ILS/GS really well in this configuration as well as autopilot. In this mode (INTERNAL), I believe the Skyview is just mimicking what the TRIG is displaying on its own screen, that is why you have to activate the OBS mode on the Trig. I’ll update more as I get information back from Dynon and Trig on this compatibility. Hope that helps those that are looking for the combination I have. I’ll post pictures later today. Last note- Like others in on this forum, I’m in IFR training so that is why I needed an additional “Nav” source. I only had the Garmin 355 and was just flying overlays for VOR/ILS’s, now I can track via NAV capability.
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Last edited by Frogman208 : 09-21-2022 at 03:17 PM. Reason: grammar
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  #2  
Old 09-21-2022, 03:01 PM
Frogman208 Frogman208 is offline
 
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Location: San Diego,ca
Posts: 73
Default Picture of Trig Installed

Here is what the install looks like for reference.
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  #3  
Old 09-21-2022, 03:52 PM
BobTurner BobTurner is offline
 
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I’d start by contacting Dynon. I have a different system (GRT Hx/SL30) but it works with ‘serial’ as the output format from the SL30. It also shows the ‘monitored’ VOR as an RSI needle superimposed on the HSI, which works very nicely on approaches.
I vaguely recall that the SL30 has some sort of fail-safe mode, where it stops sending data out if the data in from the EFIS is lost. Might check your RS232-in lines to the nav, as well as the out lines. Make sure the Dynon is constantly sending OBS data to the nav, not just when you touch the obs knob.
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  #4  
Old 09-21-2022, 04:11 PM
Frogman208 Frogman208 is offline
 
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Default Talked with Dynon

Thanks Bob, yep already talked with Dynon. They are waiting on the unit that Trig is sending them for testing. I'm running some Diagnostics for them with the SL-30 protocol and 255 protocol. I believe this is why Trig states, the TX56 is "like" the SL-30 for protocol. No worries on my end, I knew what I was getting into. The Trig TX56 is really good quality, better than I expected. Just working out the bugs with it being so new.
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  #5  
Old 09-21-2022, 04:26 PM
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Carl Froehlich Carl Froehlich is online now
 
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I suspect TRIG will sell a lot of these. I'm putting one in the new RV-10 project to go with the GNC 355 TSO GPS navigator.

Carl
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  #6  
Old 09-21-2022, 04:31 PM
Frogman208 Frogman208 is offline
 
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Hey Carl, if you look at my install picture, that is exactly what I have.
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  #7  
Old 09-22-2022, 06:55 AM
N82VM N82VM is online now
 
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Is there any difference in functionality between protocols? Why use the the GNC vs the SL30 selection?

I’m planning a TX56 too so I’m very interested in the write up.
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Last edited by N82VM : 09-22-2022 at 07:20 AM.
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  #8  
Old 09-22-2022, 12:30 PM
Frogman208 Frogman208 is offline
 
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From what I can tell with 2 days of flying both protocols, the answer is NO (maybe), from operator perspective no, not sure about the data box. Neither protocol work when the Trig CDI indicator is selected to "serial" and both work when Trig CDI indicator is selected to "internal". After this morning flight, my procedure is after engine start, dial in the local VOT on the TRIG and push the Trig (OBS) button. This energizes the Skyview CDI for the entire flight. I ran VOR's, LOC, ILS's, and autopilot coupled/uncoupled. The Dynon skyview picked up the Localizer, turned on the autopilot, armed the VNAV and got the locked and coupled ILS w/glideslope. Here is another shortfall if your running the Garmin GNC 355 series and completely separate NAV radio. . The Skyview only shows one 'source' at a time (not including RMI bugs on CDI), so if I use green needles (NAV radio), I'm not able to show my magenta lines from my GPS overlay on skyview (I know spoiled). So I track via green needles and watch the Garmin 355 flight plan screen as backup. Helped verify my track with the green needles. On some of the approaches, if I can't get the GPS approach overlay loaded in time, I go strictly by green needles and time. For those that don't know, the GNC series loads all the different types of approaches ie..LOC, ILS, GPS. You cant legally fly the ILS/LOC with GPS but its great as backup/verification to your needles.

All in all, until Dynon gets there hands on the Trig TX56 and works the small bugs, this will work to get me thru my IFR testing.
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Last edited by Frogman208 : 09-22-2022 at 12:35 PM.
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  #9  
Old 09-23-2022, 10:52 AM
N82VM N82VM is online now
 
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I found the answer to the protocol. The TX56 instal manual section 6.2.9 states the GNC protocol is the preferred choice.
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  #10  
Old 10-14-2022, 09:24 PM
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GrinchF16 GrinchF16 is offline
 
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Scott,
Great, timely post! Saving pennies but as soon as I can I’ll be buying the Trig. My stack will be identical to yours. I have the AFS ACM so will be curious how that integration works. So far, love it! Keep us posted.
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