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Page 4-20
400W Series Installation Manual
Rev. G
190-00356-02
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
Pin Name
Connector
Pin
I/O
MAIN OBI CLOCK
P4001
43
Out
MAIN OBI SYNC
P4001
45
Out
MAIN OBI DATA
P4001
44
Out
Pin Name
Connector
Pin
I/O
VOR OBI CLOCK
P4006
25
Out
VOR OBI SYNC
P4006
26
Out
VOR OBI DATA
P4006
27
Out
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
μ
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.
Содержание GNC 420AW
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