Diagnostics - Garmin GPS 175 Maintenance Manual

3.4.3.8 COM (GNC 355 Only)
The COM page allows the user to select and configure squelch mode, configure carrier squelch, configure
MIC gain, select sidetone source, and configure the volume.
3.4.4

Diagnostics

The Diagnostics page provides access to pages that are helpful for unit maintenance and troubleshooting.
Ground checks are performed using the tools on this page. The following pages are accessible within the
Diagnostics page:
• ARINC Inputs
• Serial Inputs
• Discrete Inputs
• Discrete Outputs
• HSDB Ethernet
• XPDR (GNX 375 Only)
• Main Indicator (Analog)
• Composite Indicator
• Analog Inputs
• Gillham Encoder (GNX 375 Only)
• Power Stats
• WAAS
• Temps
• Logs
• Main Data Inputs
• XPDR Main Data (GNX 375 Only)
• Clear Config Settings
3.4.4.1 ARINC Inputs
The ARINC Inputs page displays the ARINC 429 data that is being received over each ARINC 429 port.
Each port is chosen for display by touching the ARINC 429 Port button to toggle between the input ports.
Select a port to display. The GPS 175/GNX 375/GNC 355 will then display the label, SSM, Data, and SDI
for each ARINC 429 packet received by the selected port. This is useful for determining if the expected
labels are being received and for troubleshooting incorrect or swapped wiring to the input ports. The data
log can be paused/resumed by touching the Pause button. The displayed data log can be cleared by
touching the Clear Log button.
3.4.4.2 Serial Inputs
The Serial Inputs page displays the status of each serial data port. For each serial port, the status will say
either Not Configured, Receiving, or Not Receiving. This data is useful for determining if the serial data
ports are configured and operating as intended.
3.4.4.3 Discrete Inputs
The Discrete Inputs page displays the state of each of the discrete input pins on the GPS 175/GNX 375/
GNC 355. For each discrete input, the pin number, pin function, and pin active state are shown. This page
is useful for diagnosing and troubleshooting discrete wiring issues.
190-02207-A2
Rev. 3
GPS 175/GNX 375/GNC 355 Part 23 AML STC Maintenance Manual
Page 3-8