Rmi/Obi - Garmin GNC 420A Installation Manual

4.9

RMI/OBI

4.9.1 RMI/OBI Function
The MAIN OBI output provides bearing information from the active waypoint for Bendix/King Serial OBI
devices based upon the 400 Series unit's GPS navigation. For the GNS 430, the MAIN OBI output may be
configured so that it sends VOR/ILS bearing information when VLOC is selected by the GNS 430 CDI
key.
The VOR OBI output provides bearing information from the active waypoint for Bendix/King Serial OBI
devices based upon the GNS 430 VOR receiver.
When a localizer channel is tuned on the VLOC window, there is a bit in the data stream set to indicate that
a localizer frequency is tuned which stows the needle or drives it to the 3 o'clock position.
4.9.2 RMI/OBI Electrical Characteristics
Pin Name
MAIN OBI CLOCK
MAIN OBI SYNC
MAIN OBI DATA
Pin Name
VOR OBI CLOCK
VOR OBI SYNC
VOR OBI DATA
The output driver is active low. The driver output voltage is not more than 1.0 V when sinking 20 mA
The maximum off state leakage current with respect to ground is less than 10 µA
4.9.3 RMI/OBI Configuration
For the GNS 430, refer to section 5.2.10 for the MAIN OBI source configuration.
4.9.4 RMI/OBI Calibration and Checkout
None.
4.9.5 RMI/OBI Interconnect
Refer to Figure F-30 on page F-61 for the RMI/OBI interconnect.
Page 4-18
Rev N
Connector Pin
P4001 43
P4001 45
P4001 44
Connector Pin
P4006 25
P4006 26
P4006 27
.
DC
400 SERIES INSTALLATION MANUAL
I/O
Out
Out
Out
I/O
Out
Out
Out
.
DC
P/N 190-00140-02