Garmin GTN 6 Series Maintenance Manual page 42

Problem
RS-232 device is
not communicating
with the GTN.
GTN boots into
Configuration mode
rather than Normal
mode.
190-01007-B1
Rev. 4
Possible Cause
GTN RS-232 port
Check RS-232 port setting for port which the device is
not configured
connected.
correctly.
Improper setup on
the remote Verify the configuration of the other device.
device.
Device not
compatible or Verify GTN RX is connected to remote device TX and GTN
improper TX is connected to remote device RX.
connection.
Multiple TX lines
connected Verify there is only one TX source per RX port.
together.
Wiring
connections are Check wiring.
incorrect.
Baud rate and
Ensure the correct baud rate and parity settings are
parity settings not
selected in Configuration mode.
set correctly.
Remove Software Loader Card and insert database card.
Software Loader
Ensure GTN powers up in Normal mode after this.
Card is inserted
Reload software into the GTN. Refer to Section 3.2. Ensure
into data card slot.
the GTN powers up in Normal mode.
GTN 6XX/7XX Part 27 AML STC Maintenance Manual
Corrective Action
Page 4-4