Garmin GNS 480 Installation Manual

Also see for Apollo CNX80: User Newsletter User Newsletter Supplemental Flight manual Pilot's guide Data list

Installation Procedures2-40 560-0982-01 Rev A GNS 480 (CNX80) Installation Manual2.8.15.1 RMI / OBI InterfaceP5-16 OBI ClockP5-17 OBI DataP5-37 OBI SyncThe GNS 480 provides bearing from a waypoint for Bendix / King Serial OBI devices. The source usedto provide the bearing information is selected by the OBI Select input.2.8.15.2 RMI / OBI Source SelectP5-36 OBI Select InWhen the OBI Select input is open, the bearing data transmitted on the RMI / OBI output is bearing fromthe currently active GPS waypoint. When the OBI Select input is grounded, the bearing data transmittedon the RMI / OBI output is bearing from the currently tuned VOR station. If a localizer channel is tunedon the GNS 480 Nav receiver, the bearing data is flagged as invalid.2.8.16 DME TUNINGThe GNS 480 can channel a DME based upon the tuned VOR frequency. The GNS 480 outputs the KingSerial DME channeling format. When the DME Select input is grounded, the GNS 480 will actively tunethe DME.Refer to Appendix D for interconnect information.2.8.16.1 Serial DME TuningP5-14 DME Clock BusP5-15 DME Data BusP5-35 DME Channel ReqWhen the DME Channel Request line is high, the GNS 480 provides serial DME channeling data on theDME Clock / Data Buses. Data is provided in the King Serial DME channeling format.2.8.16.2 DME Select InP5-34 DME Select InWhen grounded, the GNS 480 will acknowledge a DME channel request and output data on the DMESerial Tuning interface. When open, the GNS 480 will not provide tuning information.