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The IFD540 is a plug-in replacement for a Gamin GNS530, same rack and connector pin assignments. The IFD540 has five configurable RS232 channels, I am trying to use channel 1 out in Aviation format for the SV-ARINC-429 GPS input and channel 2 out in ADS-B format for the SV-XPNDR-261 certified...

Have a SV1000 system with SV-XPNDR-261, GPS-250, ARINC-429, Avidyne IFD540 GPS NAV/COM and a Garmin GTR200 Comm. I am having a problem with the -261 seeing the RS232 IN on pin 3 from the IDF540 in either the aviation format or the ADS-B format. The GPS-250 input selection works fine and I see...