G900X/G950 Installation and Maintenance Manual – Pinouts
Page A-41
190-00719-00
Revision D
A.3.16 RMI/OBI
A.3.16.1 RMI/OBI
Function
The MAIN OBI output provides bearing information from the active waypoint based upon GPS
navigation information. The MAIN OBI output may be configured so that it sends VOR/ILS bearing
information when VLOC is selected.
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.
A.3.16.2 RMI/OBI
Electrical Characteristics
Pin Name
Connector
Pin
I/O
MAIN OBI CLOCK
P606
56
Out
MAIN OBI SYNC
P606
57
Out
MAIN OBI DATA
P606
58
Out
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
A.3.17 DME Tuning and ADF
A.3.17.1
DME Tuning Function
The GIA 63W can channel a DME based on the tuned VLOC frequency. The GIA 63W outputs 2 of 5,
BCD or Slip parallel DME and King Serial DME channeling format. When DME COMMON is held
low, the GIA 63W actively tunes the DME.