TruTrak ADI - Manual (Page 8)

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.
Magellan GPS 315 A
The Magellan GPS 315 A requires a Power/Data Cable (Magellan Product Number 730276) to provide data output.
The Magellan GPS 315 A must be configured to provide the correct output to the autopilot.
Press the MENU key then select “Setup. Press ENTER. Select “NMEA” and press ENTER. Select “V2.1 GSA” then
press ENTER. Next we must set the baud rate. Press MENU then select “SETUP” and press ENTER. Next Select
“BAUD RATE” and press enter. Select 4800 for the baud rate. Press ENTER.
Note that this is the baud rate that will be entered into the autopilot in the setup mode.
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 be entered into the autopilot in the setup mode.
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 be 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.
TruTrak Flight System 6 ADI Flight Instrument Installation Manual
December 2009 8300-016 Rev B