ARINC 708 Display Data Bus Word Format
M4K708 Module:User’s Manual
page A - 3
Faults - coded independently
Operating Mode
Note:
Weather (only)
Reflectivity (Weather) only data should be
transmitted on all azimuth addresses.
Turbulence (only)
Turbulence only data should be transmitted on all
azimuth addresses.
Weather & turbulence Turbulence data combined with reflectivity data is
allowed as a means to transmit both weather only and
weather plus turbulence words when Weather &
turbulence mode is selected.
Bit
25
24
23
22
21
20
19
LRU Failure Indication
0
0
0
0
0
0
0
No detected faults
1
0
0
0
0
0
0
Transmitter/receiver Fault
0
1
0
0
0
0
0
Antenna fault
0
0
1
0
0
0
0
Control fault
0
0
0
1
0
0
0
Altitude input fault
0
0
0
0
1
0
0
Calibration fault [T–R]
0
0
0
0
0
1
0
Display fault
0
0
0
0
0
0
1
Cooling fault
Table A-5
Faults
Matrix
Code
Bit 29
Bit 28
Bit 27
Operating Mode
0
0
0
0
Standby
1
0
0
1
Weather [only]
2
0
1
0
Map
3
0
1
1
Contour
4
1
0
0
Test
5
1
0
1
Turbulence [only]
6
1
1
0
Weather & turbulence
7
1
1
1
Reserved
[Calibration annunciation]
Table A-6
Operating mode
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