System Checkout - Ground Checks; Ground Check - Garmin GNS 480 Installation Manaul

Post-Installation Configuration & Checkout
Display Label
(cyan)
232-1: RS-232 Port 1 In
232-2: RS-232 Port 2 In
232-3: RS-232 Port 3 In
422-4: RS-422 Port 4 In
232-5: RS-232 Port 5 In
232-6: RS-232 Port 6 In
232-7: RS-232 Port 7 In
232-8: RS-232 Port 8 In
SYNCHRO
Synchro Heading
HDG:
Baro Correction Pot
BARO:
26VAC 26 VAC Reference
3.3.2 System Checkout – Ground Checks
The GNS 480 includes a self test that is executed every time the unit is turned on that checks the unit
operation as well as other internal functions. Verify that the unit does not display a failure indication
when turned on.
The GNS 480 must be properly configured prior to performing system checkouts. When
configured correctly, the GNS 480 will annunciate failures that are detected with
interfacing systems when it is first turned on. Any annunciated failures should be
corrected prior to proceeding with the ground checks.
3.3.2.1 GPS Navigation Checkout
Switch on the GNS 480 in the normal mode to complete this part of the checkout – this is accomplished by
either exiting the Ground Maintenance Mode or by turning the GNS 480 OFF and then turning it back
ON.
The GNS 480 requires a "seed" position, time, and date for the GPS sensor to know which satellites to
look for. Once this information is entered it will be saved and updated automatically, so it will not be
necessary to re-enter the information at every start-up. If the GNS 480 is moved a great distance without
being turned on, the seed position may have to be re-entered.
3-30
Signal Name Connector – Pin(s)
P1-4,23
P1-3,21
P1-7,25
P1-11,26
P5-1,41
P5-2,42
P5-10,44
P5-30,44
P5-18,19,38
P5-13,33,53
P5-20,39
560-0982-01 Rev L
'FF' will be displayed if no data has
been received.
The hex value of the most recently
received data will be displayed if
data is being received.
'00' will be displayed if data was
received, but no data has been
received in the last 5 seconds.
If the synchro valid discrete is
INVALID or the 26VAC, 400Hz
reference is not present, '---' will be
displayed; otherwise, the angle of
the synchro heading input will be
displayed.
The value of the baro potentiometer
input will be displayed. '0' will be
displayed if input is open, or if the
baro pot input has not been properly
calibrated.
The voltage and frequency of the
26VAC, 400Hz input will be
displayed. If this input is not
connected, or if the voltage is below
1VAC, '---' will be displayed.
NOTE
GNS 480 (CNX80) Installation Manual
Expected Display
(white)