Figure 6-2 Serial Port Page; Figure 6-3 Dst Priority Page; Table 6-1 Serial Port Selections - Garmin GTR 225 Installation Manual

6.4.1 SYS Configuration Group
6.4.1.1 Serial Port Page
The SERIAL PORT page configures the input/output (I/O) mode for the RS-232 port. See table 6-1 for the
selections available.
Selection
NONE (DEFAULT)
AVN IN/MAPCOM
NMEA
WARNING
Do not use the NMEA serial port selection with GNC 255 display software version 2.01
when connected to an external device, which uses CDI deviation data from the GNC's
RS-232 NMEA data output. Using this NMEA serial port selection with display software
version 2.01 may result in VOR reversed course deviation indication.
NOTE
The G500/G600 does not utilize CDI deviation data from the GNC 255's RS-232 NMEA
data output.
6.4.1.2 DST Priority Page
If both GPS and DME systems are providing data to the GNC, the DST PRIORITY page configures the
source priority for the display of distance, speed, time (DST) information. The GNC displays DST data
from a DME or a GPS device. Select "GPS, DME" to give priority to DST data from a connected GPS
receiver or "DME, GPS" to give priority to DST data from a connected DME receiver.
190-01182-02
Rev. F

Figure 6-2 Serial Port Page

Table 6-1 Serial Port Selections

No serial data input/output.
Serial port will receive "RS-232 Aviation" format input data, as defined in
appendix B.1 (for example, as received from Garmin GTN 6XX/7XX and
GNS 400W/500W Series navigators). There is no serial data output from
the GTR/GNC with this selection.
Serial data "RS-232 NMEA" input/output as defined in appendix B.2 (for
example, with G500/G600, GPSMap, Aera Series, XL Series, or GX
Series). See WARNING.

Figure 6-3 DST Priority Page

Description
GTR 225/GNC 255 TSO Installation Manual
Page 6-3