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External Annunciators
This page describes how to interface the KLN-90B with external annunciators. It uses an example implementation for the MD41.
Note
External annunciators and buttons are optional. A NAV/GPS switch is only necessary if the unit should drive the HSI. If no OBS/LEG switch is installed, the user can change the mode on the MOD pages. The GPS/APR button and related annunciators are only required, if the unit is to be used for IFR approaches. All other lights are optional.
Bind the lights to the following conditions:
NAV GPS DRIVES NAV1 = 0
GPS GPS DRIVES NAV1 = 1
ARM GPS APPROACH MODE = 1 or 3
ACTV GPS APPROACH MODE = 2 or 3
OBS GPS OBS ACTIVE = 1
LEG GPS OBS ACTIVE = 0
MSG L:KLN90B_MsgLight = 1
WPT L:KLN90B_WptLight = 1
GPS APPROACH MODE will be set to 3 during light test when the self test page is shown. This signals, that ARM and ACTV should both be lit. It will not be set to 3 during normal operation. Alternatively, you can check L:KLN90B_AnnunTest to light up all lights during self-test.
NAV/GPS Bind to K:TOGGLE_GPS_DRIVES_NAV1
GPS/APR Bind to KLN90B_ApprArm_Push. Set Input.ExternalSwitches.AppArmSwitchInstalled in the panel.xml to true if this switch is installed in the cockpit.
OBS/LEG Bind to K:GPS_OBS Important: Input.ExternalSwitches.LegObsSwitchInstalled in the panel.xml must be set to true. This will disable mode switching via the KLN 90B.