190-01115-01 G3X™/G3X Touch™ Avionics Installation Manual
Rev. AV Page 30-153
Each connected GDU 4XX has five configurable RS-232 (PFD 1, MFD1, PFD2, MFD2, PFD 3, and
MFD3) channels. Use the Touch Panel or a Move Selector Knob to select the desired RS-232 channel, the
optional settings are:
Garmin Data Transfer - The proprietary format used to exchange data with a PC or a GDL 39
Garmin Instrument Data - Used for connecting to compatible Garmin LRUs (e.g. GSU 25, GMC 30X)
GTS™ Traffic System Instrument Data - This setting is used exclusively to communicate with GTS
series products.
Connext® Connected Cockpit 38400 baud (GTN™ touchscreen avionics Connext 2) - Used for
connecting a GDU 4XX display to a GTN 6XX/7XX for performing Connext functions, such as flight plan
transfer.
Connext 57600 baud - This setting is used with a wired connection to the GTX™ 345/45R when
configured for Connext Format 1, the GDL 5X, the GPS 175, the GNX 375, and the GNC 355.
Connext 115200 baud - This setting is used with a wired connection to the GTX™ 345/45R transponder
when configured for Connext Format 4 configuration setting.
Garmin HSDB - Used for connecting to compatible Garmin LRUs (e.g. GTS 8XX, see Section 24.2
and
Appendix G.2
)
Garmin VHF Comm - Outputs frequency tuning data to an SL40, GTR 200, or GTR 225 comm radio,
and receives radio status data for on-screen radio display.
Garmin VHF Nav/Comm - Outputs frequency tuning and VOR radial selection data to an SL30 or
GNC® 255 VHF Nav/Comm radio. Receives lateral/vertical NAV deviation signals and radio status data
for on-screen radio display.
Aviation Out - Primarily used to provide GPS data to ELT units. Can also be used to send data to a
portable GPS unit.
Fuel Flow Out - Variant of the Shadin Format which can be used to provide data to a GTN, GNS, etc.
Fuel/Airdata Out - Variant of the Shadin Format which can be used to provide data to a GTN, GNS, etc.
NMEA Out - Supports the output of standard NMEA 0183 version 3.01 data at user selectable baud rate of
either 4800 or 9600. The GDU outputs data from the selected GPS source (internal GPS or external GPS1/
GPS2) using NMEA sentences.
A setting that allows switching the NMEA output between "Normal" and "Fast" speeds is accessed by
pressing the MENU Key on the Comm Page (at least one output must be set to NMEA Out) which enables
a Configure NMEA Output button to appear.
Pressing this button displays a pop-up window which allows the selection of the Lat/Lon format and the
output rate. These settings affect all RS-232 ports that are configured to output NMEA data. The selected
speed is displayed following the baud rate now for all ports configured for NMEA output. This feature is
useful for sending data to devices that require the full set of NMEA sentences at a slower pace.