GRT Avionics, Inc.
May 2019
Sport EX/Horizon EX Install. Manual
21
Rev. A
5-3: Trig TT22 (RS-422 Port)
The Sport EX provides an RS-422 port for a direct connection to the Trig TT22 Mode S
transponder. If this port is wired to the Trig TT22, the following setting should be
configured (the setting is accessed from the “General Setup” submenu within the “Set”
menu):
TT22 A/B Port: (On/Off)
Default is off. Turn this on if a Trig TT22 is wired to the Sport
EX. This setting should be off if a Trig TT22 is wired to the DU via a serial port using the
GRT Trig Adapter.
5-4: Required Setup for the Internal GPS
The internal GPS must be designated as
“GPS1,” “GPS2” or “No” (not used) in order to
specify which
of the two possible GPS sources the EFIS may use. “No” specifies that the
internal GPS will not be used. For external GPS inputs, the serial port setup specifies if a
particular input is configured as GPS1 or GPS2. The following user setting defines how
the internal GPS is to be used
and is accessed from the “General Setup” submenu within
the “Set” menu.
Internal GPS: (None/GPS1/GPS2)
Default is GPS1. This setting is used to assign the
internal GPS to one of the two EFIS GPS inputs. If “None” is selected, up to 2 external
GPS inputs may be: wired through the serial inputs, come from data transmitted over the
inter-display unit link from another GRT EFIS and/or
via the “Own Ship Position” provided
in ADS-B traffic data.
At least one GPS should be connected to the EFIS. Only one GPS source (internal or
external) can be assigned to a GPS designation at any one time.
The Horizon EX does not include an internal GPS and must use external GPS sources.
5-5: Multiple AHRS Inputs
A user setting is provided to allow for designating if the internal AHRS is to be used, and
if so, whether it is identified as AHRS1 or AHRS2. This setting is accessed from the
“General Setup” submenu within the “Set” menu.
Internal AHRS: (No/AHRS1/AHRS2)
Default and normal configuration is AHRS1. If the
display unit is wired to an external AHRS, the serial port for this AHRS would be
configured as AHRS2. If two sets of external AHRS data is provided to the DU, this setting
must be set to “No.”
The Horizon EX does not include an internal AHRS and must use external AHRS sources.
