Garmin G3X Installation Manual page 133

Fuel Flow 2 Input – The Fuel Flow 2 input selections are Fuel Return (EI FT-60) and Fuel Return
(Floscan 201B-6). This input can be used for a second fuel flow sensor to measure differential fuel flow
(Displayed Fuel Flow = Flow 1[feed] – Flow 2[return]).
Discrete 1-4 Inputs – These inputs can be configured either active high or active low. For example, this
input will generate a CAS (Crew Alerting System) message when pulled low if configured as Active
Low. The user can also select the Alert Color and Alert Label to be displayed when active. The discrete
inputs are displayed on the PFD when active.
Discrete 1-2 Outputs – The GSU 73 has 2 annunciator outputs, these outputs do not require any
configuration and can be optionally wired to an external annunciator. Discrete Out 1 acts as a master
warning annunciator and is active any time a warning CAS message (Red Alert) is displayed on the PFD.
Discrete Out 2 acts as a master caution annunciator and is active any time a caution CAS message
(Yellow Alert) is displayed on the PFD. Reference Appendix G for wiring guidance.
Engine Power – Configurable for Lycoming and Continental engines only. Select engine type (also
normally-aspirated or turbocharged) from the pull-down list. Engine power requires data from RPM,
manifold pressure, and fuel flow.
G3X Installation Manual – Engine Sensor Installation and Configuration Page 8-29
190-01115-01 Revision E