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Page 5-88
G1000 System Maintenance Manual
Rev. A
190-00903-00
e.
RS-232 1, 2
―
Indicates status of the GDU 104X’s RS-232 channel. A green box indicates
the
RS-232 loopback tests passed. A red or black box indicates it may not be used or a wiring
fault is present.
f.
IRDA
―
Indicates status of GDU 104X IrDA infrared port. Used for Garmin testing, it is not
activated at this time
g.
ETHERNET 4
―
Indicates status of GDU 104Xs Ethernet channel 5. Used for Garmin
testing, it is not activated at this time
'ANALOG' Window:
a.
PHOTOCELL A, B: Displays the input value of display photocells, between 0 and 9999.
The values can be converted to a percentage by adding a decimal place two digits over from
the right (example:
8035 = 80.35%). If there is a significant split (~30% to 50%) you can expect the display to
appear different from the other display in the aircraft, IF both of their lighting curves are set
to the same values. Replace the display if one photocell reading is significantly different
from the other.
b.
BEZEL THERM
―
Displays the temperature of the GDU bezel, expressed in degrees Celsius.
(Example: 2064 = 20.64 degrees Celsius)
c.
CCFT CRNT 1, 2
―
Displays an indication of current flowing through the display backlight
bulbs. Number does not reflect actual current value and is not useful for troubleshooting.
d.
LGHT BUS AC
―
Displays the input value of the AC lighting bus, if enabled. Disregard
number if it is not used in the installation.
e.
LGHT BUS DC
―
Displays the input value of the DC lighting bus, if enabled. Disregard
number if not used in the installation.
f.
POWER (1.3V, 2.5V, 3.3V, 28 V 1/2)
―
Displays power input voltages of various internal
components. Should be within 10% of the desired voltage. (example: for 2.5V field, 2500 =
2.500 Vdc; for 28V Field, 3633 = 36.33 Vdc). Replace the display if these values are more
than 10% from the desired voltage.
g.
INTRNL TEMP 1, 2
―
Displays the internal temperature sensor values of the display, in
degrees Celsius. (Example: 45267 = 45.267°C)
'DISCRETE' Window:
GDU System ID 1
GDU System ID 2
GDU System ID 3
Display Mode
Black Black Green MFD
Black Black Black
PFD
#1
Green Black Black PFD
#2
a.
SYS ID 1, 2, 3
―
Displays the current system ID assigned to the display. Green indicates that
the System ID pin is strapped to ground. Black indicates that the System ID pin is left ‘open’
and not strapped to ground.
b.
RVRSNRY MODE 1, 2
―
Displays the current status of the reversionary modes.
Reversionary Mode 1 is activated by the GMA 1347 reversion button. Reversionary Mode 2
is activated by a second GMA 1347, if installed. Reversionary 1 input is a ground on Pin 58,
reversionary 2 input is a ground on Pin 15.
