Garmin GTX 33 Installation Manual - Page 46

Serial Data Electrical Characteristics, RS-232 Input/Output, Table 4-7.

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EXTERNAL IDENT SELECT (remote IDENT) is a momentary input. Refer to the GNS 480 (CNX80) or the appropriate GTN 6XX/7XX Installation Manual for remote ident configuration. EXTERNAL STANDBY SELECT (remote STANDBY) is used when two GTX 33 systems are installed in an aircraft. Refer to Figure D-4, for the EXTERNAL STANDBY SELECT interconnect. When EXTERNAL STANDBY SELECT is grounded, ARINC 429 OUT PORT 1 remains active, while PORT 2 is inactive. When TIS is inactive, the GTX 33 logs onto TIS service when a momentary ground is applied to P3301-46. When TIS is active, a momentary ground logs off of TIS service. Refer to the GNS 480 (CNX80) Installation Manual, MX20 Installation Manual, or appropriate GTN 6XX/7XX Installation Manual for TIS configuration. An AUDIO MUTE SELECT mute switch may be used to control TIS audio alerts. TIS (Traffic) Mute must be clearly marked with MUTE ON/MUTE OFF or TIS Audio ON/Audio OFF labels. The muting feature may be enabled through a Multi-Function display. In order to prevent inadvertent muting, the status of muting must default to "Mute off" upon each power cycle. Refer to the GNS 480 (CNX80) Installation Manual or appropriate GTN 6XX/7XX Installation Manual for AUDIO configuration. 4.6 Serial Data Electrical Characteristics The GTX 33 manages support for several equipment interfaces. The GTX 33 can be configured to include GPS, Airdata, AHRS, EFIS/Airdata, and ADLP 429 inputs, functioning as an ARINC 429 data concentrator. The GTX 33 has four ARINC 429 input ports, making it capable of taking altitude, air data, heading, EFIS selected course and possible future features, and then concentrating it on the ARINC 429 OUT 2 ports for possible data link applications. The GTX 33 is designed to feed all outgoing data to the external display via RS-232 data ports. 4.6.1 RS-232 Input/Output Table 4-7. RS-232 Input/Output Pin Name RS-232 OUT 1 RS-232 IN 1 RS-232 OUT 2 RS-232 IN 2 SIGNAL GROUND SIGNAL GROUND Connector P3301 P3301 P3301 P3301 P3301 P3301 Pin I/O 23 Out 22 In 25 Out 24 In 51 -- 58 -- 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 in Appendix D for the RS-232 serial data interconnect. When connecting two GTX 33 transponders to a GPS, the unit can only receive RS-232 serial data from one unit at a time. Use a DPDT switch for connecting both serial data and External Standby Select. Refer to Figure D-4. GTX 33 Installation Manual Page 4-8 190-00906-00 Rev. F

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GTX 33 Installation Manual
190-00906-00
Page 4-8
Rev. F
EXTERNAL IDENT SELECT (remote IDENT) is a momentary input. Refer to the GNS 480 (CNX80) or
the appropriate GTN 6XX/7XX Installation Manual for remote ident configuration.
EXTERNAL STANDBY SELECT (remote STANDBY) is used when two GTX 33 systems are installed
in an aircraft. Refer to Figure D-4, for the EXTERNAL STANDBY SELECT interconnect. When
EXTERNAL STANDBY SELECT is grounded, ARINC 429 OUT PORT 1 remains active, while PORT 2
is inactive.
When TIS is inactive, the GTX 33 logs onto TIS service when a momentary ground is applied to
P3301-46. When TIS is active, a momentary ground logs off of TIS service. Refer to the GNS 480
(CNX80) Installation Manual, MX20 Installation Manual, or appropriate GTN 6XX/7XX Installation
Manual for TIS configuration.
An AUDIO MUTE SELECT mute switch may be used to control TIS audio alerts. TIS (Traffic) Mute
must be clearly marked with MUTE ON/MUTE OFF or TIS Audio ON/Audio OFF labels. The muting
feature may be enabled through a Multi-Function display. In order to prevent inadvertent muting, the status
of muting must default to "Mute off" upon each power cycle. Refer to the GNS 480 (CNX80) Installation
Manual or appropriate GTN 6XX/7XX Installation Manual for AUDIO configuration.
4.6
Serial Data Electrical Characteristics
The GTX 33 manages support for several equipment interfaces. The GTX 33 can be configured to include
GPS, Airdata, AHRS, EFIS/Airdata, and ADLP 429 inputs, functioning as an ARINC 429 data
concentrator.
The GTX 33 has four ARINC 429 input ports, making it capable of taking altitude, air data, heading, EFIS
selected course and possible future features, and then concentrating it on the ARINC 429 OUT 2 ports for
possible data link applications.
The GTX 33 is designed to feed all outgoing data to the external display via RS-232 data ports.
4.6.1
RS-232 Input/Output
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 in Appendix D for the RS-232 serial data
interconnect.
When connecting two GTX 33 transponders to a GPS, the unit can only receive RS-232 serial data from
one unit at a time. Use a DPDT switch for connecting both serial data and External Standby Select. Refer
to Figure D-4.
Table 4-7.
RS-232 Input/Output
Pin Name
Connector
Pin
I/O
RS-232 OUT 1
P3301
23
Out
RS-232 IN 1
P3301
22
In
RS-232 OUT 2
P3301
25
Out
RS-232 IN 2
P3301
24
In
SIGNAL GROUND
P3301
51
--
SIGNAL GROUND
P3301
58
--