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GTX 330 Installation Manual Page 4-7
190-00207-02 Revision G
4.5.2 Discrete Inputs
Table 4-7. Discrete Inputs Pin Assignments
Pin Name Pin Number I/O
EXTERNAL IDENT SELECT* 12 In
EXTERNAL STANDBY SELECT* 13 In
SQUAT SWITCH IN 17 In
TIS CONNECT SELECT* 46 In
AUDIO MUTE SELECT* 47 In
* These inputs are considered active if either the voltage to ground is < 1.9 V or the resistance to
ground is < 375 Ω. These inputs are considered inactive if the voltage to ground is 11-33 Vdc.
EXTERNAL IDENT SELECT (remote IDENT) is a momentary input.
Refer to Figure C-4 for the squat switch interconnect and to Sections 5.2.10. and 5.2.15 for the squat
switch configuration.
EXTERNAL STANDBY SELECT (remote STANDBY) is a momentary input used when two GTX 330
systems are installed in an aircraft. Refer to Figures C-4, C-7 and C-9 for the EXTERNAL STANDBY
SELECT interconnect and to Sections 5.2.15 for verifying external standby configuration. When
EXTERNAL STANDBY SELECT is grounded, ARINC 429 OUT PORT 1 remains active, while PORT
2 is inactive.
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 P3301-46. When TIS is active, a
momentary ground logs off of TIS service. Refer to Figures C-1, C-3, C-4, C-7 and C-8 for TIS
CONNECT SELECT connections and to Sections 5.2.2, 5.2.3, 5.2.8 and 5.2.9 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 Figures C-1, C-4 and C-8
for AUDIO MUTE SELECT connections and to Sections 5.2.2 and 5.2.3. for AUDIO configuration.