User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 4−25
15 Dec 2005
Table 4−3. ACSS ATCRBS−Mode S Control Panel Interface Descriptions
Connector
Pin
Designation Functional Description
J1−1, 2 PANEL AND DISPLAY LIGHTING INPUT: (J1−1 LOW, J1−2 HIGH)
5 V ac, 3.0 Watts maximum lighting input for front panel and display lighting. Lighting is
provided by incandescent lamps.
J1−3, 4 115 V ac INPUT POWER: (J1−3 HIGH, J1−4 LOW)
The control panel is powered from a 115 V ac power bus. A single power supply provides
the power requirements for the control panel. Maximum power is 2.0 Watts.
J1−5 ANTENNA TRANSFER DISCRETE OUTPUT: (J1−5)
This discrete output is used to provide the ability to switch a RF relay for dual transponder
installations that have only one set of antennas. The output is OPEN when the transponder
is in standby (inactive) mode, and GROUND when the transponder is in an active
operational mode.
J1−6 DC GROUND INPUT: (J1−6)
Reference for all discrete inputs/outputs. Tied to aircraft dc ground.
J1−7 STANDBY/ON OUTPUT: (J1−7)
This discrete output (STANDBY/ON) will mimic the XPDR switch position placing one
transponder in Standby and the other in the ON (active) mode. Both transponders will
never be in the ON mode simultaneously. This output is low (GROUND) when in Standby
mode and OPEN when in the ON mode. This output can sink 100 mA maximum.
Connect this pin to transponder STANDBY/ON Discrete Input.
J1−8 CHASSIS GROUND INPUT: (J1−8)
Tied to airframe. Also used to connect ARINC 429 cable shields to the chassis.
J1−9 FUNCTIONAL TEST INPUT: (J1−9)
Functional test can also be initiated using this discrete input. When J1−9 is grounded
through a remote test switch, a functional test similar to pushing the TCAS TEST button on
the front panel is initiated.
J1−10 WARNING AND CAUTION OUTPUT: (J1−10)
This discrete output provides a low signal to a remote master warning system when the
control panel receives a Monitor Lamp fault indication from the active transponder.
Otherwise it provides 7 to 30 V dc or a resistance of >100 K ohms to ground. This output
can sink 20 mA maximum.
J1−12 XPDR FAIL #2 INPUT: (J1−12)
The control panel XPDR FAIL annunciator is controlled by this input. When the
transponder is operating normally this input remains grounded. Otherwise, the transponder
opens this input to indicate a transponder failure. The control panel then turns the
annunciator ON to alert the user of a transponder malfunction. The transponder fail
annunciator turns on only when the failed transponder is selected by the control panel
Mode switch.
Connect this pin to the transponder XPDR FAIL #2 Discrete Output.