Rmi/Obi; Rmi/Obi Function; Rmi/Obi Electrical Characteristics; Rmi/Obi Configuration - Garmin GPS 400W 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 400W Series unit's GPS navigation. For the GNS 430W, the MAIN OBI
output may be configured so that it sends VOR/ILS bearing information when VLOC is selected by the
GNS 430W CDI key.
The VOR OBI output provides bearing information from the currently tuned VOR station for
Bendix/King Serial OBI devices based upon the GNS 430W 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

MAIN OBI CLOCK
MAIN OBI SYNC
MAIN OBI DATA
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 A.
4.9.3

RMI/OBI Configuration

For the GNS 430W, refer to Section 5.3.11 for the MAIN OBI source configuration.
4.9.4

RMI/OBI Calibration and Checkout

Refer to Section 5.5.6.11 for calibration and checkout.
4.9.5

RMI/OBI Interconnect

Refer to Figure H-21 for the RMI/OBI interconnect.
Page 4-20
Rev. G
Pin Name
Pin Name
Connector Pin
P4001 43
P4001 45
P4001 44
Connector Pin
P4006 25
P4006 26
P4006 27
400W Series Installation Manual
I/O
Out
Out
Out
I/O
Out
Out
Out
190-00356-02