190-00906-00 GTX 33 Installation Manual
Rev. F Page 4-11
4.7 RS-232 Input/Output, Software Update Connections
When the GTX 33 is installed in a system other than a Garmin Integrated Flight Deck an optional RS-232
serial data connector should be installed in the aircraft for future software upgrades, negating the need to
remove the transponder from the aircraft. The connector can be mounted anywhere convenient for access,
such as under the instrument panel, on a remote avionics shelf next to the unit or in the instrument panel
itself. Be sure to label the connector for Software Update. Do not include the Test Mode Select switch in
the aircraft. See Figure 4-2 for software update connections.
If the GTX 33 installation interfaces with a GNS 480 (CNX80) in the aircraft, the GNS 480 (CNX80) must
be turned off during GTX 330 software upload, due to loading of RS-232 port 1.
The installation of an optional software upgrade connector is highly recommended. If the
connector is wired in the aircraft, transponder removal and reinstallation for software
upgrade is not required.
If the unit is removed from the aircraft and operated, always connect J3302, (and J3303
for GTX 33D) to an antenna or a 50 Ω, 5-Watt load. The GTX 33 transmits Mode S
acquisition squitter replies about once per second whether interrogations are received or
not.
Beginning with software version 3.06, the GTX 33 software can be updated in the Configuration mode as
well as in Test mode. Updating software in Configuration mode does not require the TEST MODE
SELECT switch.
Figure 4-2. GTX 33 Software Update Connections
To Next Page
Loading...
Need help?
General
