Dynon ARINC-429 ADAHRS data to Avidyne FMS systems

V-tail

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Jan 4, 2025
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I am trying to understand what data is made available or could be made available from the Dynon ADAHRS to the Avidyne FMS systems.

From the module specification page, the following information is provided, which essentially describes the input the Dynon system receives from the Avidyne IFD FMS:

The SV-ARINC-429 Module enables compatibility with third-party IFR GPS/NAV devices - such as the Avidyne IFD series - that communicate using the ARINC-429 protocol. The module allows SkyView to accept additional ARINC-429 inputs to provide advanced features that IFR pilots desire, including such as GPS steering for autopilot, CDI auto-scaling, and vertical guidance information, along with VOR, LOC, and ILS functionality. When installed, SkyView becomes the full HSI for these navigation devices, with no need to install a conventional Course Deviation Indicator or Glide Slope head.

What I am looking to understand is what data that the Dynon system sends or may be able to send back to the IFD FMS. Specifically, does (or can) the Dynon send ‘Baro Corrected Altitude’ to allow enroute vertical navigation capability. This is not the approach glideslope, but the enroute altitude changes that the Avidyne can support. Also, it would be nice if the Dynon system would send, either over ARINC 429 or an RS232 interface, the fuel flow information, similar to what can be sent from the EI fuel flow system to the Avidyne. The same FT-60 fuel flow sensor is used in the Dynon system. This could provide a redundant system and allow the range ring information, fuel to destination, etc. to also be reported on through the Avidyne and associated apps.

I have searched the Dynon documentation on the ARINC 429 module and see configuration settings for connecting to the Avidyne FMS systems, but do not see the information that is or can be sent.
 

V-tail

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Out of curiosity, have you gone through the Third Party Connection and Configuration Guide to see if your answer is in there?

I have searched the Dynon documentation on the ARINC 429 module and see configuration settings for connecting to the Avidyne FMS systems, but do not see the information that is or can be sent.
includes https://dynonavionics.com/includes/guides/Third_Party_Device_Connection_and_Configuration_Reference-Rev_C.pdf
 

Rhino

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Okay. I was just curious since you didn't mention it. I haven't gone in-depth into the ARINC data stream, so I won't attempt to feign knowledge of it. But maybe someone else here has, and will chime in.
 

V-tail

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Jan 4, 2025
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V-tail - FYI, altitude is sent from the Dynon into the IFD, helps a lot when you want to do GPS VNAV approaches 😉.
Can you elaborate on what altitude is sent? As mentioned in my post, I am specifically looking for information on Baro-corrected altitude? My IFD did GPS VNAV approaches prior to the Dynon install. I am not aware of more capability I now have enabled for GPS VNAV types of approaches that was a result of the Dynon system being installed that I didn't have before with the IFD.

The Baro-corrected altitude into an IFD provides enablement of en-route altitude changes like cross IOW at 3,000 - giving vertical information output. Here is a explanation using the Garmin navigator: Youtube video on VNAV w/ Garmin for the VNAV capabiliy I am looking for.
 
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