IFD with Dynon HDX and external backup CDI

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   For redundancy in case of a HDX screen or ADAHRS failure, I'm looking into keeping my GI-106A external CDI that is connected now via the main indicator interconnect (not 429) and connecting an HDX via 429 and RS232. I'm worried about the IFD getting CDI VLOC desired course mixed signals due to getting this from multiple sources (resolver from GI-106A and 429 from HDX). 
Does anyone have experience with this configuration?  Can I disable 429 in into the IFD and not connect the 429 from the HDX ARINC 429 to the IFD?  Did it need this 429 data for anything? It seems like it'll already have the data it needs natively and via RS232.  I think this would mean I would only be able to select the NAV course on the GI-106A, but the IFD would get this from the resolver via the main indicator interconnect wiring. Would the IFD then output this course to the HDX to sync the courses between the CDIs? 

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brou0040 Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 13 Dec 2012 Location: KIYK Status: Offline Points: 722	Post Options Post Reply Quote brou0040 Report Post Thanks(0) Quote Reply Topic: IFD with Dynon HDX and external backup CDI Posted: 11 hours 28 minutes ago at 10:24pm
	For redundancy in case of a HDX screen or ADAHRS failure, I'm looking into keeping my GI-106A external CDI that is connected now via the main indicator interconnect (not 429) and connecting an HDX via 429 and RS232. I'm worried about the IFD getting CDI VLOC desired course mixed signals due to getting this from multiple sources (resolver from GI-106A and 429 from HDX). Does anyone have experience with this configuration? Can I disable 429 in into the IFD and not connect the 429 from the HDX ARINC 429 to the IFD? Did it need this 429 data for anything? It seems like it'll already have the data it needs natively and via RS232. I think this would mean I would only be able to select the NAV course on the GI-106A, but the IFD would get this from the resolver via the main indicator interconnect wiring. Would the IFD then output this course to the HDX to sync the courses between the CDIs?