GIA 63/GIA 63W Installation Manual Page 4-23
190-00303-05 Revision S
4.8 RMI/OBI
4.8.1 RMI/OBI Function
The VOR OBI output provides bearing information from the active waypoint based upon the 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.
4.8.2 RMI/OBI Electrical Characteristics
Pin Name Connector Pin I/O
VOR OBI CLOCK P602 25 Out
VOR OBI SYNC P602 26 Out
VOR OBI DATA P602 27 Out
INACTIVE: Floating (can be pulled up to externally sourced Vout in the range 0 ≤ Vout ≤ 33VDC)
Leakage current in the INACTIVE state is typically ≤ 10 uA to ground
ACTIVE: Vout ≤ 0.5VDC with ≤ 20 mA sink current
Sink current must be externally limited to 20 mA max
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