User's Manual Part 2

T
2
CAS / Part No. 9000000
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
34-43-20
15 Feb 2003
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4--74
Table 4--19. APM/ASDB Programmable Discret e Outputs(cont)
Digital Signal Definition NotesPin #
Ground Discrete Output #8 RTP--13J GND Disc Output 500mA
Ground Discrete Output #9 RTP--13K GND Disc Output 500mA
Ground Discrete Output #10 RTP--14A GND Disc Output 500mA
Ground Discrete Monitor Output #1 RTP--14B GND Disc Monitor 500mA
Ground Discrete Monitor Output #2 RTP--14C GND Disc Monitor 250mA
Ground Discrete Monitor Output #3 RTP--14D GND Disc Monitor 250mA
(a) Discrete Input Ground/Open
T
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CAS provides ground/open discrete inputs for aircraft level discrete interfaces.
The GROUND and OPEN logic states are determined as follows:
GROUND ≤ 3.5 Vdc at the input OR a resistance of less than 10 Ohms to
ground.
OPEN ≥ 14.0 Vdc at the input OR a resistance of g reater than 100k Ohms to
ground.
The discrete inputs source 1.0 ± 0.25 ma of current when the input is grounded
and has diode isolation circuitry to prevent the inputs from being loaded to
ground when power is removed from the T
2
CAS.
NOTE: When an input goes to a discrete on both TCAS and TAWS/RWS, the
input current is twice the specification for a single discrete.
(b) Discrete Input +28 V
dc/Open
T
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CAS provides +28 Vdc/open discrete inputs for aircraft level discrete
interfaces. The +28 Vdc and OPEN logic states are determined per the
following:
+28 V d c ≥14.0 Vdc at the input.
OPEN ≤ 3.5 Vdc at the input OR a resistance o f greater than 100k Ohms to
the positive voltage source.
The discrete inputs sink 1.0 ± 0.25 mA of current when a +27.5 V
dc input and
has diode isolation circuitry is applied to prevent the inputs from being loaded to
ground when power is removed from the T
2
CAS.
NOTE: When an input goes to a discrete on both TCAS and TAWS/RWS, the
input current is twice the specification for a single discrete.