User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 4−49
15 Dec 2005
Table 4−8. XS−950 Data Link Transponder Interface Descriptions (cont)
Connector Pin
Designation
Functional Description
P1B−6F,
P1B−6G,
P1B−6H
ALTITUDE TYPE SELECT PROGRAM INPUT:
The Altitude Type Select program pins are used to configure the transponder for the type
of altitude source that is connected to it. The inputs use ground/open logic. The Altitude
Type Select Common (pin P1B−6H) can be used to supply a ground.
Program Pin
P1B−6F P1B−6G Definition
Ground Ground Selects Gillham Altitude Source
Ground Open Selects ARINC 575 Altitude Source
Open Ground Selects ARINC 407 Synchro Altitude Source
Open Open Selects ARINC 429 Altitude Source
P1B−7A
THRU
P1B−7J
ARINC 565 ANALOG AC AIR DATA COMPUTER #2 INPUTS:
Second ARINC 565 Analog AC Air Data Computer Input. See pins P1A−4A Thru 4J.
P1B−71 BOTTOM ANTENNA RF INPUT:
RF input from bottom antenna.
P1C−1 XPDR 115 V ac INPUT POWER: (H)
This pin along with the XPDR 115 V ac RETURN line (pin P1C−7) provides the 115 V ac
power requirements for the transponder.
NOTE: Only −10XXX thru −54XXX transponders accept 115 V ac, 400 Hz input power.
If the 115 V ac version is used, the power should be connected through a 5 amp
circuit breaker, and the pins for the 28 V dc input (P1C−10 and P1C−3) should
be left unconnected.
P1C−3 XPDR +28 V dc RETURN: (L)
See pin P1C−10.
P1C−4 XPDR OFF (NO) INPUT:
This discrete input is used to turn the transponder power supply OFF. It should not be
connected in aircraft installations.
P1C−6 FAN +28 V dc OUTPUT: (+)
The 28 V dc version of the transponder can control an externally mounted 28 volt fan to
provide cooling air for the transponder. The Fan +28 V dc Output (P1C−6) should be
connected to the positive input of the fan, and the Fan Return (NO) Output (P1C−9)
should be connected to the negative input of the fan. The output has the capability to
drive a fan that draws up to 200 mA of current. The fan is turned on when the internal
transponder temperature rises above 30 degrees centigrade. In the 115 V ac version of
the transponder, the outputs are not used.
P1C−7 XPDR 115 V ac RETURN: (C)
See pin P1C−1.
P1C−8 SIGNAL GROUND INPUT:
Connect to Aircraft Signal Ground.