Rs-232 Input/Output, Software Update Connections - Garmin GTX327 Installation Manual

4.3.1 RS-232 Serial Data Electrical Characteristics
The GTX 327 can be configured to include GPS, Altitude and Airdata data inputs on two RS-232 input
lines. Altitude data supplied to the GTX 327 can be output to the GPS on an RS-232 output line.
Table 4-6. RS-232 Input/Output Pin Assignments
Pin Name
RS-232 OUT 1
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 Figures C-1 through C-3 for the RS-232 serial data
interconnect and to section 5.2.5 for RS-232 serial data configuration.
4.4

RS-232 Input/Output, Software Update Connections

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.
When the GTX 327 is installed in an aircraft an optional RS-232 serial data connector should be installed
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 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 4-3 for software update
connections.
If the GTX 327 installation interfaces with a GNS 480 (CNX80) in the aircraft, the GNS 480 (CNX80)
must be turned off during GTX 327 software upload, due to loading of RS-232 port 1.
Figure 4-3. GTX 327 Software Update Connections
Page 4-6
Revision K
Pin Number
20
19
2
NOTE
I/O
Out
In
In
GTX 327 Installation Manual
190-00187-02