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Revision A5
HXr Installation Manual GRT Avionics
maximum of 2.0 amps for the 6 discrete inputs combined. The function of these discrete outputs
are set on the Set Menu > General Setup > Discrete Outputs. A discrete output can change state
based on indicated airspeed, or when a GRT roll, pitch, or either is engaged. This menu includes
a setting for the output to be open or ground when active (normally ground is the active state).
At the bottom of this menu the airspeed is set that above which, the discrete will be active.
5.6 USB Ports
Each HXr display unit has 2 USB ports. Their primary function is to upload software updates using
a USB thumb drive memory stick. The USB stick may also be used to record flight data. USB
extension cables are available so that a receptacle for a USB memory stick can be located at a
convenient place in the cockpit.
Many new devices, such as ADS-B receivers, use USB as the primary means of communication with
the EFIS. A USB hub may be used to connect up to three devices to one of the EFIS USB ports.
5.7 GRT GPS Modules
The HXr may be wired to an external panel-mount GPS, and/or a GRT Avionics GPS receiver. GRT
offers two GPS receiver options. The Adaptive AHRS may include an optional WAAS GPS/GSNS
receiver within it, or the GRT Avionics RAIM GPS module may be used. Please note that the GRT
RAIM and WAAS GPS/GSNS receivers do not meet the certification requirements for stand alone
use for IFR flight at this time. However, the RAIM function does provide integrity monitoring, such
that it can detect inaccurate data from a GPS satellite, thus providing more assurance that the GPS
position is accurate. A certified IFR GPS such as a GNS430/530 must be coupled to the HXr for GPS
approaches at this time.
5.8 Specific Equipment Interconnect Details
Please refer to the Appendix of this manual for sample interconnect diagrams. Several diagrams
are provided as examples of simple and more complex systems, but the final configuration of the
system is completely up to the panel designer. Radios, GPS units, transponders, and other devices
compatible with HXr each have a Compatible Equipment Supplement that contains information
on wiring, setup programming, and user interface. Refer to these supplements together with the
manuals from the device manufacturers for proper installation, setup and use. Supplements are
downloadable from the Support page of the GRT website, www.grtavionics.com.
