Garmin Apollo CNX80 Installation Manaul - page 117
Post-Installation Configuration & Checkout
GNS 480 (CNX80) Installation Manual
560-0982-01 Rev L
3-37
MAPMX Interface (use for MX20 version 5.0 or later) or GMX 200:
1. Check the System Info page on the MX20/GMX 200 to verify that the data is available to the
MAPMX port and that it is being processed properly.
2. Load a flight plan into the GNS 480 and verify that the flight plan is displayed on the
MX20/GMX 200 on the FPL page.
NOTE
If the GNS 480 is configured to receive baro correction from a baro potentiometer the
GNS 480 will provide baro-correction data to the MX20/GMX 200. If no external baro
correction is supplied to the GNS 480, the MX20/GMX 200 will supply baro correction to
the GNS 480.
3. If a the GNS 480 is configured for BARO POT: NOT INSTALLED, verify that the baro-correction on
the MX20/GMX 200 and GNS 480 are the same. Change the baro-correction on the MX20 and verify
that it changes on the GNS 480. The GNS 480 baro-correction can be viewed on the System
Configuration page, which is accessed by pressing the
FN key repeatedly until the SYS smart key is
displayed. The
SYS smart key is then pressed, followed by the CNFG smart key, if necessary.
3.3.2.4.5
Dual GNS 480 Cross-Talk Checkout
If two GNS 480s are installed, they will share information with each other. This check verifies that the
two GNS 480s are communicating. If the following steps do not perform correctly, check the electrical
connections and configuration setup.
NOTE
If the GNS 480 is configured to communicate with the MX20 using the MAPMX
interface, turn the MX20 off when performing this checkout.
1. Verify that the message “Communications lost with cross-linked unit” is not currently active on either
GNS 480.
2. On GNS 480 #1 and #2, view the baro correction using the Configuration page. This page is accessed
by pressing the
FN key twice, causing the SYS smart key to be displayed. The SYS smart key is then
pressed, followed by the
CNFG smart key, if necessary. The baro correction is the first item on the
list (Baro Correct.).
3. Change the baro correction on GNS 480 #1 and verify that it changes to the same value on GNS 480
#2. Repeat by changing the baro correction on GNS 480 #2 and verifying that it changes to the same
value on GNS 480 #1.
NOTE
If one GNS 480 is configured to accept baro correction data from an altimeter, the baro
correction on the altimeter must be changed and the new value must appear on both GNS
480s.