Uning - Garmin Apollo CNX80 Installation Manual

Installation Procedures
2.8.15.1 RMI / OBI Interface
P5-16 OBI Clock
P5-17 OBI Data
P5-37 OBI Sync
The CNX80 provides bearing from a waypoint for Bendix / King Serial OBI devices. The source used to
provide the bearing information is selected by the OBI Select input.
2.8.15.2 RMI / OBI Source Select
P5-36 OBI Select In
When the OBI Select input is open, the bearing data transmitted on the RMI / OBI output is bearing from
the currently active GPS waypoint. When the OBI Select input is grounded, the bearing data transmitted
on the RMI / OBI output is bearing from the currently tuned VOR station. If a localizer channel is tuned
on the CNX80 Nav receiver, the bearing data is flagged as invalid.
2.8.16 DME T

UNING

The CNX80 can channel a DME based upon the tuned VOR frequency. The CNX80 outputs the King
Serial DME channeling format. When the DME Select input is grounded, the CNX80 will actively tune the
DME.
Refer to Appendix D for interconnect information.
2.8.16.1 Serial DME Tuning
P5-14 DME Clock Bus
P5-15 DME Data Bus
P5-35 DME Channel Req
When the DME Channel Request line is high, the CNX80 provides serial DME channeling data on the
DME Clock / Data Buses. Data is provided in the King Serial DME channeling format.
2.8.16.2 DME Select In
P5-34 DME Select In
When grounded, the CNX80 will acknowledge a DME channel request and output data on the DME Serial
Tuning interface. When open, the CNX80 will not provide tuning information.
2-38 560-0982-00 Rev D Apollo CNX80 Installation Manual