Gtx 33/330 Software Update; Figure 7-7 Software Update Connection - Garmin GTX 330D Maintenance Manual

7.2 GTX 33/330 Software Update

If a unit is replaced and does not have the approved version of software installed, software can be
downloaded from the Dealer Resource Center at www.flyGarmin.com. For dual GTX installations the
software loading procedures below must be carried out on each GTX.
The GTX 330 software can be updated in Configuration mode as well as in Test mode. Updating software
in Configuration mode does not require the TEST MODE SELECT switch. However, the TEST MODE
SELECT switch is required for the GTX 33 series. Refer to figure 7-7 for software update connections.
GARMIN GTX 330/33
AIRCRAFT POWER 21
AIRCRAFT POWER 42
TEST MODE SELECT
GROUND 27
GROUND 43
#1 RS-232 IN
190-00734-11
Rev. 6
P3301
18
22
OUT 23

Figure 7-7 Software Update Connection

GTX 33X and GTX 3X5 ADS-B Maintenance Manual
TRANSPONDER
14/28 VDC AIRCRAFT POWER
5A
TEST MODE SELECT
NC
NO
1
5
TEST MODE SELECT SWITCH
OPTIONAL FOR GTX 330
3
3
9-PIN D-SUB CONNECTOR TO
PC'S COMM PORT
2
2
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