User's Manual
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 4−29
15 Dec 2005
Table 4−4. Gables Control Panel Interface Descriptions (cont)
Connector Pin
Designation
Functional Description
J1/J2−13 IDENT INPUT: (J1/J2−13)
The IDENT discrete input provides another means of activating the IDENT function. This
input allows the control panel to interface with an external IDENT switch located in the
cockpit. When the input is grounded, the IDENT function is activated; otherwise it should
remain open.
J1/J2−14 TRANSPONDER FAIL LOGIC DISCRETE INPUT: (TDR−94D ONLY) (J1/J2−14)
This input allows the control panel to use 28 volt logic from a Collins TDR−94D
transponder to control the transponder fail annunciator. This input should not be used
unless a Collins TDR−94D transponder is used with this control panel.
J1/J2−15 AIR/GROUND SW DISCRETE OUTPUT: (J1/J2−15)
This output is directly connected to the AIR/GND discrete input (J1/J2−24). This output
can be routed directly to the transponder to disable it (Standby), and terminate ATC code
replies. J1 discrete logic operates independently from J2.
J1/J2−16 AIR DATA SOURCE OUTPUT: (J1/J2−16)
Ground/Open output that is dependent on the front panel ALT RPTG and XPNDR switch
positions. This discrete output is enabled when altitude reporting is selected in the ON
mode. When altitude reporting is selected OFF, the J1/J2−16 output remains in the
OPEN state.
This discrete output is connected to the transponder AIR DATA SOURCE SELECT
Discrete Input.
J1/J2−18 MONITOR LAMP POWER INPUT: (J1/J2−18)
These inputs are used as the input power source for the transponder fail annunciator on
the front panel of the control panel. The input supply voltage is a dimmable 26 V dc at
200 mA maximum.
J1/J2−20 TRANSPONDER STRAPPING CONFIGURATION: (J1/J2−20)
This discrete input programs the control panel to operate, and be able to properly
interface to one of two types of transponder configurations. If this input is left OPEN then
the control panel operates in accordance with ACSS transponder specifications. If the
input is GROUNDED, it is programmed to operate in accordance with Collins transponder
specifications.
J1/J2−21 LAMP TEST INPUT: (J1/J2−21)
To initiate a lamp test, J1 or J2 pin 21 must be grounded through an external switch. All
segments and annunciators in the control panel LCD (except RPLY and decimal points)
are ON for as long as this input is grounded. ARINC 429 labels are not affected by the
activation of a lamp test mode.