User's Manual Part 2
T
2
CAS / Part No. 9000000
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
34-43-20
15 Feb 2003
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
4--39
Table 4--4. XS--950 Data Link Transponder Interface Description (cont)
Connector Pin
Designation
Functional Description
P1B--3J ALTITUDE COMPARISON F AIL DISCRETE OUTPUT:
This discrete output annunciates a comparison failure in the altitude data for the
transponder if Gillham altitude data is selected. The output annunciates a failure if the
two altitude sources are not within 500 feet.
The output drives a ground logic threshold (voltage of less than +3.0 Vdc) when the
altitude is valid, and an open logic threshold (resistance is greater than 100k Ohms to unit
ground) when a failure has occurred. The output is capable of sinking 200 mA of current.
P1B--3K XPDR FAIL DISCRETE OUTPUT #1:
This discrete output is set to annunciate an internal transponder failure or that the Mode S
address is illegal (All 0’s or 1’s). The output will source a voltage of greater than +5.0 Vdc
at 100 mA of current when a failure has occurred, and an open circuit (resistance of
greater than 100k Ohms to unit ground) when the transponder is operating normally. The
output contains diode isolation. Connect this pin to the Control Panel XPDR FAIL #1
input.
P1B--4A THRU
P1B--4K, AND
P1B--5K
ENCODING ALTIMETER #1 INPUTS:
First of two Encoding Altimeter interfaces. See pins P1A--1A thru 4K and P1A--2K.
P1B--5A, 5B ARINC 429 AIR DAT A COMPUTER #2 BUS INPUT: (P1B--5A [A], P1B--5B [B])
Second ARINC 429 Air Data Computer bus input. See pins P1A--7H, 7J.
P1B--5C, 5D ARINC 575 AIR DAT A COMPUTER #2 BUS INPUT: (P1B--5C [A], P1B--5D [B])
Second ARINC 575 Air Data Computer bus input. See pins P1A--6H, 6J.
P1B--5E, 5F ARINC 429 COMM A/B TO ADLP BUS OUTPUT: (P1B--5E [A], P1B--5F [B])
See pins P1A--2A, 2B.
P1B--5G ALTITUDE COMPARISON ON / OFF DISCRETE INPUT:
This discrete input is used to enable/disable the Altitude Comparison function. The
Altitude Comparison function is used only if a Gillham altitude source is selected. This pin
uses a ground/open logic as follows:
Ground = Altitude Comparison Enabled
Open = Altitude Comparison Disabled
NOTE: If an altitude source other than Gillham is selected, the input has no function.
P1B--5H MODE S DATA LINK PROGRAM INPUT:
This program input specifies if the transponder is connected to an Airborne Data Link
Processor (ADLP) Unit. The input uses ground/open logic as follows:
Ground = ADLP is Installed
Open = ADLP is not installed
P1B--5J ANTENNA BITE PROGRAM INPUT:
This program input specifies if the transponder is to perform a built--in test to the antenna
subsystem. The transponder performs a continuity check of the antenna to make sure it
is not an open circuit. The input uses ground/open logic as follows:
Ground = Enables Antenna Subsystem Test
Open = Disables Antenna Subsystem Test