Serial Data Electrical Characteristics; Table 4-7 Discrete Inputs Pin Assignments - Garmin GTX 330 Installation Manual

4.5.2 Discrete Inputs
EXTERNAL IDENT SELECT (remote IDENT) is a momentary input.
Refer to Figure D-4 for the squat switch interconnect and to
configuration.
EXTERNAL STANDBY SELECT (remote STANDBY) is a switched discrete input used when two
GTX 330 systems are installed in an aircraft. Refer to
EXTERNAL STANDBY SELECT interconnect and to
configuration. When EXTERNAL STANDBY SELECT is grounded, the GTX 330 operates in standby
mode.
When TIS CONNECT SELECT is inactive ("Standby" is displayed on the 400/500 Series units) the
GTX 330 logs onto TIS service when a momentary ground is applied to J3301-46. When TIS is active, a
momentary ground logs off of TIS service. Refer to
Figure D-8 for TIS CONNECT SELECT connections, and to
and Section 5.2.10 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
Figure D-8 for AUDIO MUTE SELECT connections and to
configuration.
AVIONICS MASTER ON SELECT
EXTERNAL IDENT SELECT*
EXTERNAL STANDBY SELECT*
SQUAT SWITCH IN
TIS CONNECT SELECT*
AUDIO MUTE SELECT*
*These inputs are considered active if either the voltage to ground is < 1.9 V or the resistance to ground
is < 375 . These inputs are considered inactive if the voltage to ground is 11-33 Vdc.

4.6 Serial Data Electrical Characteristics

The GTX 330 can be configured to include GPS, Airdata, AHRS, EFIS/Airdata, and ADLP ARINC 429
inputs, functioning as an ARINC 429 data concentrator.
Since the Garmin 400/500 Series products have only two ARINC 429 input ports, the GTX 330 manages
support for several equipment interfaces. The GTX 330 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 port. This line is then wired to an ARINC 429 input port on the
400/500 Series products. TIS data is included on the same high-speed ARINC 429 bus.
Airborne Data Link Processor (ADLP) is reserved for future data link applications. ADLP requires an
ARINC 429 input and output. The ADLP interface allows the Mode S data link transponder to function as
190-00207-02
Rev. U

Table 4-7 Discrete Inputs Pin Assignments

Pin Name
Section 5.2.11 for the squat switch
Figure D-4, Figure D-7, and
Section 5.2.20 for verifying external standby
Figure D-1, Figure D-3,
Section 5.2.2, Section
Section 5.2.2 and
Pin Number
GTX 330/330D Installation Manual
Figure D-9 for the
Figure D-4, Figure D-7
5.2.3, Section 5.2.9
Figure D-1, Figure D-4, and
Section 5.2.3 for AUDIO
I/O
1 In
12 In
13 In
17 In
46 In
47 In
Page 4-7
and