Rs-232 Input/Output, Software Update Connections - Garmin GTX 32 Installation Manual

4.4.1 RS-232 Serial Data Electrical Characteristics
The GTX 32 can be configured to include GPS, Altitude, and Airdata data inputs on two RS-232 input
lines. Altitude data supplied to the GTX 32 can be output to the GNS 480 (CNX80) on an RS-232 output
line.
Refer to Figure C-3 (of this document) and the GDL 90 Installation Manual 560-1049-02 for information
when connecting to a GDL 90.
Pin Name
RS-232 OUT 1
RS-232 OUT 2
RS-232 IN 1
RS-232 IN 2
The RS-232 outputs conform to EIA Standard RS-232C with an output voltage swing of at least ±5 V
when driving a standard RS-232 load. Refer to Appendix C for RS-232 serial data interconnect.
4.5

RS-232 Input/Output, Software Update Connections

When the GTX 32 is installed in a system other than a Garmin Integrated Flight Deck system 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 32 installation interfaces with a GNS 480 (CNX80) in the aircraft, the GNS 480 (CNX80)
must be turned off during GTX 32 software upload, due to loading of RS-232 port 1.
GTX 32 Installation Manual
190-00303-60
Table 4-5. RS-232 Input/Output Pin Assignments
Figure 4-2. GTX 32 Software Update Connections
Connector Pin
P3271
20
P3271
24
P3271
19
P3271
2
Revision F
I/O
Out
Out
In
In
Page 4-5