Configuring The Kmh 820 Ihas For The Mx20 - Garmin MX20 Installation Manual

Installation
8. Demo Mode must be disabled for all aircraft installations.
9. If the GDL 90 UAT is installed, select Disp/Ctrl or Disp Only for the GDL 90 UAT Radio setting.
The Disp Only setting should be selected when another device controls the GDL 90 UAT. A GDL
90 configuration setting establishes which device controls the GDL 90. Only one device (e.g.,
MX20, GSL 71, GNS 480 or other device) should control GDL 90 operation.
10. If the GDL 90 UAT is installed and you want to allow entering/editing the GDL 90 transponder
squawk code, select Enabled. The squawk code is accessed from one of the Menu selections in
Traffic mode. If the aircraft has an operating transponder, the GDL 90 Code Edit option must be
disabled. Only one device installed in the aircraft can be the entry point for ATC-assigned squawk
codes.
11. Enter GDL 69 cable loss. Refer to the GDL 69/69A Installation Manual (Garmin P/N 190-00355-
02).
12. Enter in antenna gain. Refer to the GDL 69/69A Installation Manual (Garmin P/N 190-00355-02).
13. Enter the Radar Indicator number. This number should match the port number of the radar that the
MX20's ARINC 429 control lines are connected. The ALL option must be selected when the MX20
is connected to a GWX 68. The ALL option is not recommended when there are multiple radar
control/display devices being used.
14. Press Enter/Menu to confirm all settings.
15. After the 30-second waiting period, turn the MX20 power off to apply all configuration settings.
MX20 power must be cycled before configuration changes will take effect. After a
configuration change, a message will appear on the screen telling you to wait 30 seconds
before turning off power. You may continue to make configuration changes without pausing;
however, do not turn off power to the MX20 until waiting 30 seconds after the last
configuration/ setting change. The message will disappear when it is safe to cycle power.

2.8 Configuring the KMH 820 IHAS for the MX20

Figure 2-19 shows the connections between the MX20 display and the KMH 820 IHAS. To work properly
with the MX20, the KMH 820 IHAS must be configured as described below.
The EGPWS function of the KMH 820 IHAS must be configured as follows:
- Category 4: Terrain Display ID = 4
- Category 5: I/O Discrete ID = 1
- Category 9: Terrain Display Popup ID = 0
The remainder of the EGPWS configuration items are installation-specific and consequently not specified.
Refer to the KMH 820 Installation Manual for configuration instructions.
NOTE: The MX20 will automatically range to 10nmi if a terrain pop-up occurs.
NOTE: With Terrain Display ID 4 the peaks data will be embedded in the terrain sweep.
For the TAS functions of the KMH 820 IHAS, the configuration module should be strapped as follows:
- Controller type: Discrete
- Display Valid: Ignore
The remainder of the TAS configuration items are installation-specific and consequently not specified.
Refer to the KMH 820 Installation Manual for configuration instructions.
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560-1025-09 Rev E MX20 Installation Manual