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190-01007-A1 System Maintenance Manual GTN 6XX/7XX Part 23 AML STC
Rev. 7 Page 3-17
3.4.5 GTN Diagnostics Page
The GTN Diagnostics page, shown in Figure 3-17, is accessed from the Configuration Mode Home page
and is a useful tool for diagnosing issues and troubleshooting problems. Ground checks are also performed
using the tools on this page.
Figure 3-17. GTN 6XX and 7XX Diagnostics Pages
ARINC Inputs
This page displays the ARINC 429 data that is being received over each ARINC 429 port. Each port can be
chosen for display by touching the Port key and toggling between the input ports. Select a port to display.
The GTN will then display the label, SSM, Data, and SDI for each ARINC 429 input port. This is useful
for determining if the expected labels are being received and also for troubleshooting incorrect or swapped
wiring to the input ports. The data log can be paused by toggling the Pause key. Clear the data log by
touching Clear Log key.
Serial Inputs
This page displays the serial data that is being received and is useful for determining if the GTN is
receiving data on each connected port. Select the desired port by touching the Port key and selecting the
RS-232 channel from the list. The data log can be paused by toggling the Pause key. Clear the data log by
touching Clear Log.
Discrete Inputs
This page displays the state of each of the discrete input pins on the GTN. This page is useful for
troubleshooting discrete wiring issues.
Discrete Outputs
This page displays the state of each of the discrete outputs and allows them to be toggled between active
and inactive. This is useful for ensuring that annunciator and signal outputs are properly connected to
annunciator lights or other LRUs and that they are receiving the signal.