ADSB Out Configurations IFD - RS232 out = ADSB(Avi) AXP340 * Squat Switch Source - (If using WOW (Weight on Wheels from IFD540) Pseudo WOW; Low when ground (This will transition @ 30knts GPS ground speed) * GPS Position Source - Trig ADS-B; when connected to IFD540/440 * GPS Line Speed - 9600Bps * System Certiā¦