Garmin G3X Installation Manual page 554

A green checkmark will appear next to the name of each Comm port when it is receiving valid data. No
checkmark is displayed if data has not yet been received. A red X is diplayed if no data has been received
after an intial timeout period, or if data has been received and then interrupted.
G3X installations with a single GDU 37X will display the RS-232 and ARINC 429 configuration settings
on separate soft-key selectable pages.
31.4.13.1 RS-232 (PFD 1, MFD, and PFD 2 Comm Port) Configuration options
Each connected GDU 37X has three configurable RS-232 channels, 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)
Garmin HSDB - Used for connecting to compatible Garmin LRUs (e.g. GTS 8XX, see Section 24.2 and
Section 25.2)
NMEA Out - Supports the output of standard NMEA 0183 version 3.01 data at a user selectable baud rate
of either 4800 or 9600. The GDU outputs data from the selected GPS source (internal GPS or external
GPS1/GPS2) via 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) followed by
the ENT Key.
A pop-up window appears 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.
Fast (every second): GPBOD, GPRMB, GPRMC, PGRMH, PGRMZ
Normal (every two seconds): GPAPB, GPBOD, BPBWC, GPGGA, GPGLL, GPGSA, GPGSV,GPRMB,
GPRMC, GPRTE, GPVTG, GPWPL, GPXTE, PGRME, PGRMH, PGRMM, PGRMZ
190-01115-01 G3X/G3X Touch Installation Manual - GDU 37X Config and Post Install Checkout
Rev. AA Page 31-102