Discrete Inputs Checkout; Discrete Outputs Checkout; Hsdb Provisional Wiring Checkout; Figure 6-39. Discrete Inputs Page - Garmin GTN 635 Installation Manual

6.10.3 Discrete Inputs Checkout

If the GTN is connected to external switches, perform the
following steps:
1. Access the Discrete Inputs page, as shown in
Figure 6-39, by touching the ‗Discrete Inputs' key
on the GTN Diagnostics page.
2. For each external switch that is connected,
exercise the switch and check the ‗active' or
‗inactive' indication on the screen correlating to
the appropriate switch input, and ensure it is
displayed correctly.

6.10.4 Discrete Outputs Checkout

If the GTN is connected to external annunciators/systems, perform the following steps:
1. Access the Discrete Outputs page, as shown in
Figure 6-40, by touching the ‗Discrete Outputs'
key on the GTN Diagnostics page.
2. For each annunciator output that is connected to
an external system or annunciator, toggle the
output ACTIVE (corresponding box is filled green
and displays ‗ACTIVE') and INACTIVE
(corresponding box is not filled green and displays
‗INACTIVE') by touching the key corresponding
to the output. Verify that the appropriate external
annunciator illuminates when the output is set to ACTIVE and extinguishes when the output is set
to INACTIVE. If the output is not connected to an annunciator but provides an input to another
system, verify that the other system receives the signal.

6.10.5 HSDB Provisional Wiring Checkout

If provisional wiring has been installed for the GTS 8XX,
GDU 620, or other Garmin LRU to interface via HSDB,
follow the procedure below to ensure it has been installed
correctly.
1. Go to the GTN Diagnostics page, as shown in
Figure 6-23.
2. Touch the HSDB (Ethernet) key.
3. For each Ethernet port that has provisional wiring
connected to it, ensure that the port status displays
‗Connected'.
GTN 625/635/650 TSO Installation Manual
190-01004-02

Figure 6-39. Discrete Inputs Page

Figure 6-40. Discrete Outputs Page

Figure 6-41. HSDB Port Status Page
Page 6-33
Rev. C