User guide
UPSAT GX-50/60/65 
UPSAT GX-50/60/65 connections to TruTrak autopilot 
37-Pin Connector 
 on UPSAT 
 GX-50/60/65 
Signal Name 
(UPSAT) 
Signal Name 
(TruTrak) 
P101 on 
TruTrak DII 
Use pin 5 – TxD1 – if GX has no 
GPSS 
5 
or 
22 
Use pin 22 – TxD2 – if GX has 
GPSS 
Primary Serial 
Input 
17 
Power the GX-50/60/65 up and turn it on while holding down the leftmost and rightmost “smart keys.” Rotate the LARGE 
knob to the Serial Interface Configuration “CH RX TX” page. Press SEL (the selection fields will start flashing), rotate the 
LARGE knob to select the port, rotate the SMALL knob to select the desired configurations, and then press ENT when 
complete. 
If both the GX unit AND the DigiFlight unit have GPSS capability, select “GPSS” for CH 2, TX column, and wire pin 17 on 
the DigiFlight IIVSG to pin 22 of the GX unit Otherwise select “MOVING MAP” For CH 1, TX column and wire pin 17 
on the DigiFlight II / IIVS to pin 5 of the GX unit 
To restore the GX-50/60/65 to normal operation, switch its power off, and then back on. 
Note that for the GX-50/60/65 units, the autopilot will need to be set for 9600 baud. 
Garmin AT GNS480 
Garmin AT GNS480 connections to TruTrak autopilot 
P1 on GNS480  Signal Name (Garmin AT)  Signal Name 
(TruTrak) 
P101 on 
 TruTrak DII 
22  RS232 TxD2  Primary Serial Input  17 
P5 on GNS480  Signal Name (Garmin AT)  Signal Name 
(TruTrak) 
P101 on 
TruTrak DII 
4  429 OUT 1A  ARINC-A  14 
24  429 OUT 1B  ARINC-B  15 
Power 480 up and select the 1, 4, MENU/ ENTER keys immediately after the GNS 480 initialization is complete. After 
restart, the first page displayed is the SETUP page. Select the SERIAL PORTS with the button next to it. Press the small knob 
to enter the edit mode and move to the TX column for the channel that you have connected the serial wire to (channel 2). 
Select MAPCOM and 9600. Press the small inner knob again to save. Then press the BACK to go back to the Setup page. 
Select the ARINC PORTS SETUP. With the MAIN ARINC 429 CONFIG page displayed, on the row labeled Channel 1 
OUT, select and DATA ÎARINC 429, SPEED Î Low. 
Serial output baud rate should be set to 9600 on the GNS480. Set the TruTrak baud rate to 9600. 
TruTrak Flight System  16    DigiFlight II Series Auto Pilot Installation Manual 
December 2009        8300-008 Rev D 










