The minimum software versions required are:
Device Minimum
Software Version
GRT Safe-Fly GPS 2
Trig TT31 3.18
Safe-Fly GPS Setting
Safe Fly GPS Setting Required Selection
SPC Serial Port 1 Rate 38400*
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 38400 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 38400
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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Safe-Fly 2020 GPS – Rev P GRT Avionics, Inc
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