GRT Avionics Safe-Fly 2020 User manual

Safe-Fly 2020 ADS-B Compliant GPS Module with Serial Data
Combiner/ xpander
Revision P
8/21/2019
GRTAvionics.com
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Table of Contents
Revision History........................................................................................................................................
Description.................................................................................................................................................5
Compatibility.........................................................................................................................................5
Use with Non-Compatible GRT and other systems..............................................................................5
GPS Function........................................................................................................................................6
Multiple GPS Configuration for your GRT EFIS..................................................................................6
GPS Status Display (This section is preliminary).................................................................................6
Serial Data Combiner/Expander Function............................................................................................7
Installation..................................................................................................................................................8
Wiring.........................................................................................................................................................8
Power and Ground.................................................................................................................................8
Serial Ports............................................................................................................................................9
Safe-Fly/SPC Configuration......................................................................................................................9
Default Safe-Fly Configuration.............................................................................................................9
EFIS Configuration Settings...............................................................................................................10
Safe-Fly GPS Post-Installation Checkout Procedure...............................................................................11
Status Reporting.......................................................................................................................................11
GPS Specific Status.............................................................................................................................12
Approved Devices – Wiring and Configuration.......................................................................................12
Trig TT21/TT22..................................................................................................................................12
Post-Installation Checkout - Verifying Trig TT-22 is Receiving GPS Data....................................13
Trig TT31............................................................................................................................................13
Sandia..................................................................................................................................................15
Uavionix..............................................................................................................................................15
Operation without EFIS Control (Also Legacy Horizon WS and HS models)...............................15
EchoUAT Settings - (Required).......................................................................................................15
EFIS Configuration..........................................................................................................................16
EFIS Configuration - TT22/EchoUAT Settings...............................................................................17
Wiring – GRT SafeFly to EchoUAT for Current GRT EFIS Models..............................................20
Wiring – GRT SafeFly to EchoUAT with no EFIS control (Including Sport and Horizon WS and
HS Models)......................................................................................................................................21
Safe-Fly with EchoUAT Post-Installation Checkout Procedure......................................................22
Verifying operation via the FAA Performance Report Request...............................................................23
What to do if your FAA Performance Report shows problems...........................................................23
No ADS-B output.............................................................................................................................23
SIL or both SIL and SDA fails in report with Safe-Fly and echoUAT............................................2
Only SDA fails in report with Safe-Fly and echoUAT:...................................................................2
Only NACv fails with Safe-Fly and echoUAT operating without EFIS control:............................2
NACv fails in installations with EFIS control:................................................................................2
Baro Alt fails at a high percentage in Transponder Monitor mode:.................................................2
Transponder replies only when transponder is interrogated With EchoUAT..................................2
Mode 3A fails at a high percentage in Transponder Monitor mode................................................25
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Mode 3A only fails when squawk code is not 1200:.......................................................................25
Only NIC fails, or the GPS loses position sometimes:....................................................................25
EchoUAT Transponder Threshold Adjustment........................................................................................26
Echo UAT Transponder Threshold adjustment procedure:.................................................................26
Specifications...........................................................................................................................................30
Connector Pinout......................................................................................................................................31
Dimensions...............................................................................................................................................32
Typical Wiring..........................................................................................................................................33
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Revision History
Rev A – Initial Release 2/9/17
Rev B – Added description of supplied cable.
Rev C – Revised for timing output for hardware version RM-2020-02
Rev D – Added EchoUAT support. Revised wiring for SafeFly Rev B Hardware. Updated GPS status
indicators.
Rev E – Added a section about recommended GPS configuration for with GRT EFIS.
Rev F – Various Changes
Rev G – Added wiring diagram and settings for Horizon and Sport WS and HS models with uAvionics
EchoUAT.
Rev H – Added note to EchoUAT settings to remind user to enter aircraft specific information in the
EchoUAT/TT22 settings menu on the general setup page.
Rev I – Minor clarifications of Uavionics EchoUAT wiring diagrams and applicability.
Rev J – Minor improvements for the Trig TT31. Added “Other TT31 Considerations” section.
Rev K – GPS Certification Level Setting changed to “B” for EchoUAT.
Rev L – Added minimum software versions for Trig TT22, settings for Flight ID and Address, GPS
Certification level for Echo UAT is now A or B, VFR ID is now N-number
Rev M – Added clarification for each type of equipment supported to perform the Safe-Fly GPS/SPC
configuration before performing the setup for the specific equipment.
Rev N – Added a note about TrigTT31 baud rate and clarified manual regarding types of settings.
Rev O – Updated Wiring diagram. Revised mounting screw to 8-32. Noted that the EchoUAT can be
mounted to the Safe-Fly GPS, and the Safe-Fly can be mounted to the Sport/Horizon 10.1.
Rev P – Clarified that a connection must be made for stand-alone Safe-Fly/Echo UAT operation,
removed EchoUAT settings that are not longer used (for COM2), and added a section on verifying
ADS-B operation via the FAA Performance Report, along with tips for resolving problems with this
report. Updated the default setting in the Safe-Fly GPS. Updated minimum software version for use
with EchoUAT.
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Description
The Safe-Fly ADS-B compliant GPS module with serial data combiner provides GPS position data as a
stand-alone module to various approved ADS-B out devices, or may be wired to any GRT EFIS to
provide high integrity GPS position data, and provide more serial ports for all GRT EFIS display units
except the WS and HS models. Included with the unit are a GPS antenna suitable for interior
mounting, and mounting hardware.
Compatibility
The Safe-Fly GPS module is fully compatible with any GRT Mini, Sport SX, Horizon HX, Horizon
HXr, Sport EX, or Horizon EX EFIS, and compatible with the Sport and Horizon WS and HS models
as a GPS navigation source and for use with ADS-B in/out devices, but will not provide a serial
combiner function for these models. It can also operate stand-alone with the ADS-B out devices listed
in the “Approved Devices” section. The minimum software versions that support the module are:
EFIS Minimum
Software Version
All models of Mini EFIS 3.00
Sport EX/Horizon EX 1.06
Sport SX 13.00
HX 9.00
HXr 5.01
Sport or Horizon WS* Any
Sport or Horizon HS* Any
* These units are not compatible with the serial data combiner and GPS accuracy indicator functions
provided by the Safe-Fly GPS, nor can these units be used to configure the Safe-Fly GPS. The Safe-Fly
may be ordered pre-configured as needed at no charge, allowing it provide GPS data to your ADS-B
output device. In addition, a serial output from the Safe-Fly may be configured to provide NMEA0183
GPS data to these EFIS models.
Use with Non-Compatible GRT and other systems
The Safe-Fly GPS module can be used with non-compatible systems, and without any connection to an
EFIS, with the following limitations:
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Default settings will allow the Safe-Fly GPS to work with an Uavionix EchoUAT with no
settings change.
Default settings will not allow the Safe-Fly GPS to work with a Trig TT22. However, the
module can be ordered with its configuration set as desired at no additional cost.
The integrity and accuracy data will not be indicated on the EFIS display unit.
The serial combiner function cannot be used.
For these installations we do recommend using the NMEA0183 output to the EFIS, to provide the EFIS
with a high-quality navigation source.
GPS unction
The Safe-Fly GPS Module utilizes a RAIM GPS which provides all data required for ADS-B 2020
compliance for ADS-B out devices listed in the “Approved Devices” section. The GPS data can also
be used with any GRT EFIS to provide the EFIS with a high-integrity navigation source. The module
communicates with compatible ADS-B out devices via a serial port connection, independent of the
EFIS display unit.
Multiple GPS Configuration for your GRT E IS
The high-integrity nature of this GPS position means the GRT EFIS user should configure the Safe-Fly
GPS as one of the two possible GPS sources to the EFIS display unit, if at least one of the GPS inputs
is not assigned to a panel mount GPS.
For installations without an external panel-mount GPS, configure the Safe-Fly GPS as GPS1 (or
whichever GPS is commonly selected as the navigation source). For installations with one panel
mount GPS that is approach capable, the Safe-Fly GPS should be used in lieu of a non-RAIM external
GPS module.
Note that if your display unit includes an internal GPS, it is set as GPS1, GPS2, or NONE via the
“Internal GPS” setting on the “General Setup” set menu. The internal GPS is a non-RAIM GPS in all
EFIS display units equipped with an internal GPS.
GPS Status Display (This section is preliminary)
All GRT EFIS display units, with the exception of the Sport and Horizon HS/WS models, will show the
integrity and accuracy of the GPS in the upper left corner of the screen. It should not be inferred that
the “Approach” accuracy allows the GPS to be used for IFR approaches, however this indication is
provided to enhance the understanding of the performance of their GPS installation. If GPS-INTEG is
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commonly displayed, or GPS-E or GPS-A is not observed, check the integrity of the antenna
connection and location of the antenna.
No accuracy or integrity information is known about this GPS, or horizontal
accuracy limit > nm.
Valid position integrity and horizontal accuracy limit > 1.0 nm, and less than .0
nm, typical of IFR enroute requirements. *
Valid position integrity and horizontal accuracy limit > 0.3 nm and less than 1.0
nm, typical of IFR LNAV approach requirements. *
No Integrity – Insufficient data for validating data with RAIM integrity test.
(Flashes Yellow and Green)
* The GPS and EFIS are not FAA certified.
Serial Data Combiner/Expander unction
In addition to the GPS functions, the module includes a serial port combiner function. The module
includes serial ports (input and output). One of these is dedicated for communication with the EFIS
display unit. The other 3 serial ports can be configured to send GPS data directly to an ADS-B output
device, or used to expand the number of serial ports available to your display unit.
Recommended Usage of Serial Combiner/Expander Serial Ports
The design of the serial port combiner minimizes data latency (delays), however, connecting the
following devices is not recommended due to their potential sensitivity to the additional latency.
GRT Autopilot Servos
Data to 3rd party autopilots, such as Trutrak and Trio
AHRS, especially when the system includes a connection to an autopilot
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GPS
GPS-E
GPS-A
GPS-Integ

Devices that provide large amounts of data at high baud rates (38 00+), such as ADS-B receivers or
XM weather will function through the combiner, but could exceed the capacity of the combiner and
reduce the available data that could be passed through the other serial ports. For this reason, high data
rate devices must be wired directly to the display unit to avoid data loss.
Installation
Mounting holes are provided in the four corners of the case for #8 flat head screws. Two screws are
sufficient when located in opposite corners for most installations. The module can be mounted in any
orientation. Typically, the unit is mounted in the forward part of the airplane so its antenna can be
positioned on the glare shield, and so it is near the GRT EFIS display units. The module should not be
exposed to water, or in a location where it is likely to get wet, or where temperatures will exceed 150
deg F when in normal operation.
The Safe-Fly includes threaded holes for - 0 screws to allow mounting of the Uavionx EchoUAT.
This simplifies the installation and reduces the number of devices that must be mounted.
To further simplify the installation, the Horizon and Sport 10.1 EFIS allow the Safe-Fly GPS to be
mounted to the rear of the EFIS using 8-32 x ¾” screws. Caution: Do not exceed 1” long screws to
avoid damaging the EFIS internal PC board.
Wiring
The Safe-Fly GPS will operate with or without a connection to a GRT EFIS. In most cases it will be
wired to a GRT EFIS to supply the EFIS with GPS data, and allow the use of the 3 serial ports on the
module. (The serial data from these ports is combined into the one serial data stream to the EFIS,
along with the GPS data, and transmitted to the EFIS via the Serial Control Out pin.) Typical wiring is
illustrated at the end of this manual.
Power and Ground
Power – Power must be provided to at least one of the three power inputs on pins 23,2 ,25. +9-32VDc
is required at 0.2A maximum. These inputs are isolated, and multiple power inputs can be used for
redundancy.
round - One ground connection is recommended, to any of the provided ground pins.
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PS Backup Power – This connection is optional. It will draw about 30 uA from the aircraft battery,
which is much smaller than the self-discharge rate of an aircraft battery. The GPS will acquire its
position in less than 20 seconds when the GPS backup power connection is not used.
Serial Ports
When planning an installation, keep in mind that one serial output on the GPS module is required if the
GPS is to provide data to an ADS-B out device. This connection minimizes latency, and allows GPS
data to be sent to your ADS-B out device without dependence on a GRT EFIS that may be connected to
it.
Control Port In/Out - This serial port is dedicated to use with a GRT EFIS. This connection allows the
EFIS to change the configuration of the module’s serial ports, and send and receive data from them.
Serial Ports 1,2,3 – These serial ports can be configured to transmit GPS data to an ADS-B output
device. Ports 1 and 2 outputs are provided on two pins, and port 3 on three pins, so that “tee-ing” into
an output when it is shared with more than one device is not required.
Safe- ly/SPC Configuration
The module is shipped pre-configured in its default configuration. This configuration can be changed
when the module is connected to a compatible GRT EFIS.
Default Safe- ly Configuration
The Safe-Fly GPS is shipped, configured to transmit NN33 on serial out 1, and NMEA0183 GPS data
on serial out 2 and 3, plus RAIM integrity and accuracy data, as indicated in the following table:
Current Default Settings
Serial Port Default Pins
Serial Port 1 Out 800 baud, NMEA0183 19,20
Serial Port 2 Out 9600 baud, NMEA0183 + RAIM 3
Serial Port 3 Out 115200 baud, NMEA0183 + RAIM
+ RAIM
1,2
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Prior to October 2017 (not applicable after that ship date).
Serial Port Default Pins
Serial Port 1 Out 38 00 baud, Safe Fly NN33 19,20
Serial Port 2 Out 9600 baud, NMEA0183 + RAIM 3,
Serial Port 3 Out 800 baud, NMEA0183 + RAIM 1,2,15
The configuration of the module can be changed by connecting it to a compatible GRT EFIS. The
configuration data is stored in the GPS module, allowing it to operate stand-alone after it is configured.
Unless specified in the setup for a particular transponder or UAT setup, the above settings should be
used.
E IS Configuration Settings
When the Safe-Fly is wired to a GRT EFIS (other than a HS or WS display unit), one serial port on the
EFIS display unit must be configured for this module. Since the GPS includes a serial port combiner,
the EFIS will provide you with additional serial ports via the Safe-Fly GPS inputs. Using the “Set
Menu”, “ eneral Setup”, configure the serial port on the EFIS that is wired to the “Serial
Control Input/Output” as “Safe-Fly PS and SPC”, at 115,200 baud. After saving these settings,
the General Setup menu will show additional settings associated with this module. They appear just
after the serial port configuration settings.
Setting Description
SPC Serial Port 1,2,3 Rate Rate applies to input and output
SPC Serial Port 1,2,3 Input Functions available are the same as the EFIS.
SPC Serial Port 1,2,3 Output Functions available are the same as the EFIS, with the
addition of multiple ADS-B GPS output functions..
GRT Safe-Fly GPS To use this GPS as a navigation source to the EFIS, set
it to “GPS1”, or “GPS2”. If not used as a navigation
source to the EFIS, set it to “Not Assigned”. Note that
the EFIS supports 2 GPS inputs, and only one GPS
input can be assigned to GPS1 or GPS2, so it may be
necessary to change an internal GPS input to “Not
Assigned”, or a serial input configured for GPS1 or
GPS2 must be set to “Not Used”.
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Safe- ly GPS Post-Installation Checkout Procedure
When used to provide position to an ADS-B out device, an ADS-B receiver can be used to verify
position data is being received by referring to the documentation for the ADS-B out device. An ADS-B
performance report should also be requested from the FAA after the airplane has been flown, to further
validate the installation.
When connected to a display unit, see the “Status Reporting” section, and verify the GPS is
communicating (this also verifies serial communication to the display unit), and verify the power inputs
used are showing voltage on these inputs. If this page is grayed out, no communication is being
received from the GPS module.
Use the Set Menu, Display Unit Maintenance, and GPS Status (select this GPS if more than one is
connected to the EFIS), and verify satellite reception. Typically, at least 7 satellites will show up on the
GPS status page. If no, or poor reception, check the antenna connection and verify the antenna has a
clear view of the sky.
Data to and from serial ports used on the module combiner are verified by any means that validates
serial communication. The technique will vary depending on the device.
Status Reporting
When a serial port has been configured for this module, the status of the module may be observed on
the Set Menu, Display Unit Maintenance. In the GRT Safe-Fly GPS/SPC menu, the following data is
provided:
Name Description
Module Software Version Software version of the GPS module
GPS Communicating Yes/No – Indicates if data has been received from
the RAIM GPS within the module. Should always
show “Yes” when the module is powered.
Load Module Software Select to update the software into the module from
a GSPCUp*.dat file.
Power Input 1 Voltage present on this power input
Power Input 2 Voltage present on this power input
Power Input 3 Voltage present on this power input
Temperature Internal temperature of processor
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GPS Specific Status
Detailed data about the performance of the GPS, including the number of satellites being tracked, the
signal strengths, etc., is available on the Set Menu, Display Unit, GPS Status. If more than one GPS is
connected to the EFIS, be sure to select this GPS.
Approved Devices – Wiring and Configuration
Trig TT21/TT22
Note: All steps in the “Safe-Fly/SPC Configuration” section above must be completed before the
following settings are made.
Use of the Safe-Fly GPS for the Trig TT21/TT22 is approved by GRT Avionics when installed and
configured as described in this section for experimental category airplanes. This installation meets the
requirements of FAR 91-227(c), when wired as shown below, and configured as indicated.
The minimum software versions required are as follows:
Device Minimum
Software Version
Safe-Fly GPS 2
Trig Adapter (if used) 5
Trig TT22 SW2.7
Configuration
Setting Required Selection
SPC Serial Port 1 Rate 38 00
SPC Serial Port 1 Output Safe Fly NN33
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TT21/TT22 Settings
These can be found in the Set Menu, General Setup, TT22 menu when controlled by the EFIS.
Setting Required Selection
GPS Input GRT Safe-Fly NN33
(select NexNav on non-GRT controllers)
GPS/TIS Rate 38 00
GPS Certification Level C
GPS NACv (m/s) < 10
Wiring
Safe-Fly PS Pin Trig TT21/22 Pin Notes:
19 – Serial Out 1 5 – GPS Input If the GRT Trig adapter is installed on the
TT21/TT22, the connection is made to pin 5 of
this adapter. The data will pass through the
adapter into the transponder. The adapter
software must be version 5 or higher, as reported
on the Set menu, General Setup,
TrigTT22/EchoUAT menu (near the top of the
General Setup settings).
Post-Installation Checkout - Verifying Trig TT-22 is Receiving GPS Data
When a GPS data stream with a valid position is being received by the TT22, the TT22 reports the
received GPS position to the controller. When a GRT EFIS is the controller, this is reported in the Set
Menu, General Setup, TT22 page on the GPS Position line. If this line shows a latitude and longitude,
the position data is being received from the GPS and will be used for ADS-B out. If this line indicates
anything else, the TT22 is not receiving valid position data and will not transmit ADS-B out. An FAA
performance report should also be requested after flying the airplane.
Trig TT31
Note: All steps in the “Safe-Fly/SPC Configuration” section above must be completed before the
following settings are made.
Use of the Safe-Fly GPS for the TT31 is approved by GRT Avionics when installed and configured as
described in this section for experimental category airplanes. This installation meets the requirements
of FAR 91.227(c), when wired as shown below, and configured as indicated.
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The minimum software versions required are:
Device Minimum
Software Version
GRT Safe-Fly GPS 2
Trig TT31 3.18
Safe-Fly PS Setting
Safe Fly PS Setting Required Selection
SPC Serial Port 1 Rate 38 00*
SPC Serial Port 1 Output Safe Fly NN33*
*These are the default settings for the Safe-Fly SPC Serial port 1, so no setup is normally required.
Wiring
Safe-Fly GPS Pin Trig TT31 Pin Notes:
19 – Serial Out 1 Pin 3 of Secondary
Connector – RS232 In 2
The TT31 must be configured for NexNav GPS
In, at 38 00 baud.
TT31 Settings
These settings are made through the Trig TT31 front panel. If the Trig TT31 does not allow its serial
port to be set above 19,200, its software will require updating to make the transponder compliant.
Trig TT33 Setting Required Selection
GPS Input NexNav on non-GRT controllers)
GPS/TIS Rate 38 00
GPS Certification Level C
GPS NACv (m/s) < 10
Other TT31 Considerations
Although the GPS is providing GPS based altitude to the Trig TT31 for its ADS-B output, pressure
altitude must also be provided to allow for the mode C altitude encoding output. When the Trig TT31
is used with any GRT EFIS, any serial output from the GRT EFIS can be configured as the altitude
encoder output. We recommend using the “Fuel/Air Data (Z Format)”. The baud rate set in the EFIS
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must match that set in the TT31. According to the Trig TT31 installation manual, RS232 In 1 (on the
primary connector) is typically used to receive this data.
Sandia
Note: All steps in the “Safe-Fly/SPC Configuration” section above must be completed before the
following settings are made.
Testing is underway to validate the use of the Safe-Fly GPS with the Sandia ADS-B out devices. This
manual will be updated when GRT Avionics and Sandia and approved the use of this GPS. We expect
this approval soon (second quarter 2017 or sooner).
Uavionix
Note: All steps in the “Safe-Fly/SPC Configuration” section above must be completed before the
following settings are made.
Use of the Safe-Fly GPS for the uAvionix EchoUAT is approved for experimental category airplanes by
GRT Avionics when installed and configured as described in this section. This installation meets the
requirements of FAR 91-227(c).
Operation without E IS Control (Also Legacy Horizon WS and HS models)
When the Safe-Fly and EchoUAT are ordered together with the pre-wired cable, no connection to an
EFIS is required. Mounting the Safe-Fly/EchoUAT, connecting the antennas, and supplying power via
the cable is sufficient to provide UAT out, meet all 2020 compliance, and provide ADS-B weather and
traffic data via Wi-Fi to a tablet. However, the EchoUAT must be configured as described in the
“EchoUAT Settings” section below before the EchoUAT will function as an ADS- out device and the
connection from pin 1 on the Safe-Fly GPS to pin 6 on the Echo UAT must be made. This wire is
included in the harness but not connected to pin 6 of the Safe-Fly GPS, as shown in the section “Error:
Reference source not found” belo..
Optional connections that allows the GRT EFIS to use the GPS position data, ADS-B weather and
traffic, and the serial port combiner features for additional serial ports are also described. These
connections also provide the EchoUAT with pressure altitude data from the EFIS (if available).
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EchoUAT Settings - (Required)
These settings are accessed via wi-fi using an Android or iphone/ipad and the Echo Install app, in the
“Installation” section of the app.
Echo UAT Setting Required Setting
With EFIS controlling Safe-
Fly PS
Required Settings*
No EFIS control of Safe-Fly
(Includes RT Avionics WS and HS
display units)
Setup Source EFIS (COM1) App
Control Source Set to “EFIS / Panel (COM1)” if
the squawk code controlled by
this display unit, or another
GRT display unit connected to
this via the inter-display link.
Set to “Transponder Monitor” if
the squawk code is set on the
transponder or otherwise not set
by the GRT EFIS.
Transponder Monitor
GPS Source EFIS (COM1) External GPS (Com2)
Traffic/Uplink Output MFD (COM2) MFD (Com2)
COM1 Rate 38 00 38 00
COM1 Data 81O 81O
COM1 PHY RS-232 RS-232
COM1 Protocol: TMAP TMAP
COM2 Rate 115,200 115,200
COM2 Input Protocol Not Applicable NMEA
* Other settings are also required corresponding to airplane specific entries, such as aircraft type,
length, width, antenna offset, etc.
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E IS Configuration
The following serial port settings are made from the “Set Menu”, “General Setup”
RT EFIS Setting
(Set Menu – eneral Setup)
Required Setting
With EFIS controlling
Safe-Fly PS
Required Settings
No EFIS control of Safe-Fly (Includes
WS and HS)
Flight ID (In Flight ID and
Address sub-menu)
Set to aircraft N-number Not required
Mode S Address Set to Mode S Address
(Hex) from FAA
registration
Set to Mode S Address (Hex) from FAA
registration
Serial Port X* In Safe-Fly GPS and SPC NMEA0183 GPS
Serial Port X* Out Safe-Fly GPS and SPC Not Applicable – Not Used
Serial Port X* Rate 115,200 9600
SPC Serial Port 1 Rate 38 00 Not Applicable
SPC Serial Port 1 Output EchoUAT TMAP Not Applicable
SPC Serial Port 1 Input EchoUAT TMAP Not Applicable
Serial Port Y* In ADS-B ADS-B
Serial Port Y* Rate 115,200 115,200
TT22/EchoUAT Settings Required – See below Not Used
*Serial port “X” refers to the serial port on the EFIS that is wired to the “Serial Control In/Out” of the
Safe-Fly GPS module. Serial port “Y” refers to the serial port used to receive ADS-B data into the
EFIS. These will be different serial ports. For example, Serial port “X” could be Serial port 1, and
Serial Port “Y” could be Serial port 2 (depending on what serial ports are not already in use and are
high-speed in your EFIS will determine the serial ports you can use.)
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E IS Configuration - TT22/EchoUAT Settings
After the serial port has been configured per the above paragraph, and serial communication with the
Safe-Fly has been confirmed by noting the serial port counter is counting for the serial port configured
for, and wired to the Safe-Fly GPS control input/output, then the following settings must be made.
These settings are made from the TT22/EchoUAT page which is accessed from the Set Menu,
eneral Setup, and will be near the top of this page. Use the “Change to activate menu” selection to
show the TT22/EchoUAT page. Set at least the following items in these pages:
RT EFIS TT22/EchoUAT Setting/Status Value
DU-SF Communication (Status) Verify “Yes”
SF-echoUAT Communication Verify “OK”
Remote Status Verify “OK”
External GPS Communication Verify “Yes”
Squat Switch Set to “None”
Aircraft Category Set as required, such as
“Light Fixed Wing”
Speed Category Set as Required
Aircraft Width (m) Set as required in meters
(divide wingspan in feet by
3 to enter as meters)
Aircraft Length (m) Set as required in meters
(divide length in feet by 3 to
enter as meters)
VFR ID Set to airplane N-number
GPS Input* Compliant TMAP
GPS/TIS Rate Does not apply to EchoUAT
GPS Certification Level* A or B
TEST Squitters Not used
TIS Output Not used
UAT/978 Receiver in Aircraft Set to “Yes”
1090-ES Receiver in Aircraft Set to “Yes”
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GPS Antenna Offset: Linear (m) Set in to distance antenna is
from nose of airplane in
meters (feet divided by 3).
GPS Antenna Offset: Lateral (m) Set in to distance antenna is
from centerline airplane in
meters (feet divided by 3)
GPS NACv* <10
Mode Verify “On”
Last Reply Count Reading does not matter
GPS Position Should show position if
valid GPS position available
Transponder Versions Reading does not matter
Adapter Software Version Reading does not matter
*These settings are required to allow the EchoUAT to transmit your data.
Required Safe-Fly software version
The software version for the Safe-Fly GPS, when used with the Uavionix EchoUAT, must be 3.0 or
later. Minimum EFIS display unit software is as follows:
EFIS Minimum
Software Version
All models of Mini EFIS .00
Sport EX/Horizon EX 2.00
Sport SX 1 .00
HX 10.00
HXr 6.00
Sport or Horizon WS* Any
Sport or Horizon HS* Any
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Safe-Fly 2020 GPS – Rev P GRT Avionics, Inc
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Wiring – GRT Safe ly to EchoUAT for Current GRT E IS Models
This section applies to to the following models: Sport SX, Sport EX, Horizon EX, Horizon HX,
Horizon HXr, and all models of the Mini.
For Sport WS, Sport HS, Horizon WS, and Horizon HS, see “Wiring – GRT SafeFly to EchoUAT
with no EFIS control” section below, following this section.
The following figure illustrates the wiring to the Safe-Fly GPS and EchoUAT, when used with a GRT
EFIS configured to control the Safe-Fly GPS via the serial control In/Out on the Safe-Fly GPS. This
wiring cannot be used with Sport or Horizon HS and WS models.
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Safe-Fly 2020 GPS – Rev P GRT Avionics, Inc
20
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