I am sending Baro Alt from my Skyview HDX (D37-8, Serial Port 3 TX, Icarus 10’, 9600), to my AXP340 Transponder for ADS-B OUT (Primary 7 (IN), Icarus, 9600), then from the AXP340 (Primary 6 (OUT), Icarus,9600) to my IFD540 (P1001-42, RS232 (IN) 3, Icarus Alt, 9600). Works great. Of course you...