GPS 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-Fly/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-Fly 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
4800 baud, NMEA0183
19,20
Serial Port 2 Out
9600 baud, NM RAIM
3
Serial Port 3 Out
115200 baud, NM RAIM
+ RAIM
1,2
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Safe-Fly 2020 GPS – Rev P GRT Avionics, Inc
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