Garmin GNC 420AW Installation Manual - page 131
400W Series Installation Manual
Page 6-3
190-00356-02
Rev. G
Table 6-1. Troubleshooting Guide
Problem Possible
Cause
Solution
• 400W Series unit RS-232 port
not configured correctly.
• Check RS-232 port setting for port
that device is connected to.
• Improper setup on the remote
device.
• Verify the configuration of the other
device.
• Device not compatible, or
improper connection.
• Verify 400W Series unit RX is
connected to remote device TX and
400W Series unit TX is connected to
remote device Rx.
• Multiple TX lines connected
together.
• Verify that there is only one TX
source per RX port.
RS-232 device is
not communicating
with the 400W
Series unit.
• Wiring connections are
incorrect.
• Check
wiring
CDI scaling on EFS
40/50 is not correct.
• On EFS 40/50, FMS #1/#2
configuration is not set to
“KLN 90-GPS”.
• Reconfigure EFS 40/50 for
“KLN 90-GPS” on FMS #1/#2 inputs,
as appropriate.