Figure 6-11 Discrete In Page; Discrete Inputs - Garmin GTX 3X5 Installation Manual

DISCRETE IN
Refer to section 5 for pinout information.
NOTE
The source priority is based upon the selections made during configuration. Refer to
section 3.10.
Function
AUD MUTE All discrete inputs
Off
AUD CNCL
P3251-37
Off
IDENT
P3251-36
Off
STANDBY
P3251-14
Off
SQUAT
P3251-57
Off
AIR DATA
P3251-58
ALT DATA All discrete inputs Selects between two pressure altitude sources.
All discrete inputs
ID SLCT on main board
(P3251)
GILLHAM On, Off
TIS-A All discrete inputs
190-01499-02
Rev. 4
Table 6-7 Discrete Inputs
Selection
The audio output will be muted until the discrete is opened.
This is connected to a higher priority audio such as TAWS.
When this discrete is grounded by a momentary switch, audio
alerts are canceled.
When this discrete is grounded by a momentary switch, the
SPI activates.
When this discrete is grounded, the unit will go into standby
mode.
This input determines the on-ground status of the aircraft. It is
active low, and a ground on this input can be configured to
mean On Ground or In Air.
Switches between two ARINC 429 ADC sources or two EFIS
ADC sources. Source 1 and 2 are set during configuration.
Source 1 is used when the discrete is open and Source 2 is
used when the discrete is grounded.
Selects the system ID and overrides configuration setting.
GTX 1 system ID is selected when this discrete is open. GTX 2
system ID is selected when the discrete is grounded.
Activates all ten Gillham/Gray code inputs. If set to OFF, the
input pins are available for configuration to other discrete input
functions.
When this discrete is momentarily grounded, TIS-A will toggle
between operate/standby.

Figure 6-11 Discrete In Page

Description
GTX 3X5 Transponder TSO Installation Manual
Page 6-12