TruTrak Digiflight II Instal Manual - Manual (Page 15)

TruTrak Flight System 13 DigiFlight II Series Auto Pilot Installation Manual
December 2009 8300-008 Rev D
GPS Setup Guide
Many new handheld GPS’s have adequate output required to fly a TruTrak autopilot. Although most support data
output not all handhelds will provide consistent and reliable information required to fly all TruTrak autopilots. Therefore,
some handhelds will not fly the airplane well. Performance may decline by putting the processor in high-load situations.
We require a data output rate of once per second for best performance. Some handhelds output data at longer intervals
than once per second. These handhelds will cause the autopilot not to perform well in turns and it may cause overshooting and
hunting. If the baud rate is selectable the optimum setting is 4800. Most handhelds will require a data cable that plugs into the
handheld and provides a medium for data output. This is an accessory and is available from your GPS manufacturer. The
setup procedures are in your GPS manual. If your GPS is not listed here consult your GPS manual for NMEA output setup.
The autopilot must have a direct connection with the handheld GPS to provide the autopilot with RS-232. To allow the
handheld GPS to be removed easily you should add a connector in your panel. We recommend that you use a 9 pin D
subminature connector in your panel that will mate to the harness from the GPS. This will also allow you to wire power and
ground and use the aircraft electrical system to power your handheld GPS.
Garmin GPS III
The Garmin III requires a Power/data cable (Garmin Part Number 010-10082-00) to provide data output.
The Garmin III must be configured to provide the correct output to the autopilot.
Press the MENU key twice. Select ‘Setup’. Press ENTER. Select the ‘Interface’ tab. Press ENTER. Select the
NMEA format.
Note: The default baud rate is 4800. This is the baud rate that will entered into the autopilot in the setup mode.
Garmin GPS 92
The Garmin 92 requires a Power/data cable (Garmin Part Number 010-10082-00) to provide data output. The Garmin 92 must
be configured to provide the correct output to the autopilot.
Press the PAGE key until the ‘Main Menu’ appears. Select ‘Setup Menu’ and press ENTER. Next select ‘Interface.’
Press ENTER. Select NONE/NMEA.
Note: The default baud rate is 4800. This is the baud rate that will entered into the autopilot in the setup mode.
Garmin GPS 195
The GPS 195 provides data output every two seconds and may be slow in recognizing turns and will overshoot the desired
track. This may cause the autopilot to wander and not perform well in turns.
The Garmin 195 requires a Power/data cable (Garmin Part Number 010-10135-00) to provide data output. The Garmin 195
must be configured to provide the correct output to the autopilot.
Press the MENU key twice. Select ‘Set-Up Menu’. Press ENTER. Select ‘Input/Output’. Press ENTER. The
input/output format is ‘No In/NMEA Out.’ Note that the baud rate is automatically set at 4800 bps.
Note: This is the baud rate that will need to be entered in the setup mode of the autopilot.
Now the Garmin 195 is correctly set up to provide the RS-232 serial output required by your TruTrak autopilot.
Garmin GPS 196 / 295
The Garmin 196 requires a Power/data cable (Garmin Part Number 010-10082-00) to provide data output.
The Garmin 196 must be configured to provide the correct output to the autopilot.
Press the MENU key twice. Use the arrow keypad to select the ‘SETUP’ tab.
Within the Setup Menu select the ‘INTERFACE’ tab. Using the arrow keypad highlight the ‘Serial Data Format’
field. Use the arrow keypad to select ‘NMEA In/NMEA Out’ and press ENTER.
Set the baud rate to 4800.
Note: This is the baud rate that will need to be entered in the setup mode of the autopilot.
Press MENU to enter the Advanced NMEA page. Select ‘Advanced NMEA Setup’ and press ENTER.
Using the arrow keypad and the ENTER key to turn OFF ‘GPS Status (GSA, GSV)’, ‘Waypoint/Route (WPL, RTE)’,
and ‘GARMIN Proprietary’.
Now the Garmin 196 is correctly set up to provide the RS-232 serial output required by your TruTrak autopilot.