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I have a GNS430 connected to my Sport HS using RS232 and ARINC. I'm considering upgrading to a separate GPS (GPS 175) and Nav-Comm (GNC255). With the 430 I use the CDI button to switch between GPS and VORLOC mode. With two independent units how does the EFIS "know" to use the Nav-Comm ARINC data for a ILS rather than the GPS data?
I have a Horizon but it’s probably the same. Push the right hand button to bring up all the button labels. On the (I think) second from the right button you see labels for VOR-Loc#1, GPS#1, etc. Select the nav source you want. You must have your current setup set to ‘auto switch with Garmin CDI button’ or something like that. You’ll want to turn that off. And you’ll need to identify the new radios as vor#1, gps#1, etc.