Table 3-14 Garmin Lru Hsdb Port Summary; Gps Requirements; Display Lighting Control; Hsdb Architecture - Garmin GI 275 Installation Manual

Display
Prop Sync Wheel
OAT
Percent Power
3.2.3

GPS Requirements

The GI 275 can be interfaced with up to two independent GPS sources and/or the internal VFR GPS. Refer
to Appendix Section C.1 for approved GPS sources. A GPS source is optional.
3.2.4

Display Lighting Control

Lighting on the GI 275 display can be controlled by either the lighting bus or the built-in photocell. The
photocell can be used for lighting control for all installations. If there is a significant reduction in lighting
bus load due to the GI 275 system installation, it is recommended that the photocell be used to control the
lighting.
3.2.5

HSDB Architecture

The HSDB architecture allows for many connection possibilities. The Ethernet architecture limitations/
options shown in this section are used as a guide for common LRU combinations. Block diagrams are
illustrated in Figure 3-2 and Figure 3-3. A summary of Garmin LRUs with HSDB capability and available
ports is shown in Table 3-14.
The following steps/figures are used to guide in making HSDB connections (not all possibilities are
included):
1. When multiple GI 275 indicators are installed, they must be connected to each other directly in
series.
2. The GTN 6XX/7XX, GTN Xi, GPS 175, GNX 375, or GNC 355, if installed, must be connected
directly to a GI 275.
3. LRUs not installed under this STC must still meet the installation requirements that are applicable
to those LRUs.
4. Choose the figure that most closely represents the aircraft's equipment and cross out any LRUs not
installed. Apply the rules above to complete the HSDB connections, if necessary.
190-02246-14
Rev. 11
Available Gauge
Display Range
N/A N/A
-125 – 175° C N/A
0 – 100% N/A

Table 3-14 Garmin LRU HSDB Port Summary

LRU
GI 275
GTN 6XX/7XX
GTN Xi
GTS 8XX
GDL 69 series
GTX 345
GPS 175/GNX 375/GNC 355
G500/G600 TXi
Available Marking
Markings
N/A
N/A
N/A
Number of HSDB Ports
2
4
4
1
4
2
1
4
GI 275 STC EIS & MFD Installation Manual
Approved
Colors Units
N/A
°C, °F
N/A
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