Garmin GNS 480 Installation Manual page 112

Post-Installation Configuration & Checkout
6. Verify that the transponder squawk code is displayed in white on GNS 480 #2. Press the XPDR
bezel key on GNS 480 #2 and verify that you are able to change the transponder squawk code on the
GNS 480. If an SL70 / GTX 330 / GTX 327 transponder is connected, you should see the squawk
code displayed on the transponder change to the value set on the GNS 480.
TIS Traffic Enabled (GTX33+TIS Configured):
1. On the GNS 480 go to the traffic page. This page is accessed by pressing the FN key repeatedly until
the TFC smart key is displayed. The TFC smart key is then pressed to display the traffic page.
2. Verify that 'Data Fail' or 'Failed' is not displayed, and the TIS operating mode (STBY or OPER) is
displayed in the upper right hand corner.
If the TIS mode is OPER, 'TFC N/A' will be displayed in the center of the screen
because you do not have TIS coverage. This is normal operation and does NOT indicate
a problem with the installation.
3.3.2.4.7 SL30 Nav/Com Checkout
When SL30 Nav tuning is provided to the GNS 480, the GNS 480 will output Distance, Speed, and Time
(DST) information via the MapCom output (the GNS 480 also provides Comm/NAV frequency
information from its database). This check verifies that the units are communicating. Ensure that the
GNS 480 and SL30 are turned on and in normal mode, and that the GNS 480 has a valid position. If the
following steps do not perform correctly, check the electrical connections and configuration setup.
1. Operate the SL30 in NAV mode.
2. Press the SL30 SEL button to bring up the NAV frequency recall lists.
3. Turn the SL30 large knob clockwise until the nearest VOR list is displayed (the identifier and
frequency of the nearest VOR station will be displayed).
4. Press the SL30 flip-flop (↔) button to swap the listed VOR frequency to the active frequency.
5. Press the SL30 SEL button and turn the SL30 large knob one click counterclockwise to show the
DST display prompt. If you do not see S
or the SL30 and GNS 480 are not communicating over the serial interface.
3.3.2.4.8 Compass System
The GNS 480 can receive heading from an external source (XYZ synchro, FADC, or ARINC 429
heading source). This check verifies that the GNS 480 is receiving data from the compass system. Ensure
that the GNS 480 and compass system are turned on the heading is valid. If the following steps do not
perform correctly, check the electrical connections and configuration setup.
1. Press the MAP bezel key and use the large, outer knob to select MAP 2.
2. Press the MENU/ENTER key to display the line select key functions, and repeatedly press the
MORE line select key until the NAV DATA line select key legend is displayed.
3. Press the NAV DATA line select key to display nav data in the window on the left.
4. The HDG field will display the magnetic heading. If the HDG field is not displayed, press the SEL
DATA line select key and use the small, inner knob to select the HDG field for display and press
MENU/ENTER when the appropriate field is selected. Verify that this heading value is not dashed
out, and that the heading agrees with the HSI (±2°).
3-38
NOTE
HOW ATA
DST D , either the feature is disabled on the SL30
560-0982-01 Rev A GNS 480 (CNX80) Installation Manual