190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 30-224
30.4.32.28 Annunciator Outputs
The GEA 24 and GSU 73 have two discrete output pins, which can be used to drive external indicator
lamps. These outputs are optional and do not require any configuration.
DISCRETE OUT 1 acts as a Master Warning annunciator, and is active (pulled low) any time a warning-
level (red) alert is displayed on the PFD.
DISCRETE OUT 2 acts as a Master Caution annunciator, and is active (pulled low) any time a caution-
level (yellow) alert is displayed on the PFD.
See Figure 26-2.2
and Figure 26-3.2 for guidance on wiring indicator lamps to the annunciator output pins.
If two EIS LRUs are configured, connect indicator lamps to EIS LRU #1 only.
The Annunciator Configuration page, accessible from the Settings tab of the EIS Configuration page
allows for additional customization of external annunciator behavior.
Figure 30-74 Annunciator Configuration
The Alert Flash setting determines whether un-acknowledged warning alerts (flashing red) will cause the
Master Warning annunciator output to flash. Selecting Disabled will prevent the Master Warning
annunciator from flashing.
The Alert Persist item determines whether the Master Warning annunciator will remain illuminated after a
warning alert (red) has been acknowledged. Selecting Disabled will cause the Master Warning annunciator
to extinguish when there are no un-acknowledged warning (flashing red) alerts. Note that setting Alert
Persist to Disabled will effectively inhibit the operation of the Master Caution annunciator, as caution-
level alerts do not flash.
The Test button performs the same function as the Annunciator Test button on the System Info page, and
can be used to test annunciator lamp wiring.
If "press to reset" behavior is desired for the external annunciator lamps, momentary pushbuttons may be
used in conjunction with any available discrete inputs to acknowledge on-screen alerts and extinguish one
or both annunciator lamps. This capability can be used independently of the above settings. See
Section 30.4.32.26
for information about connecting and configuring discrete inputs.
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