User's Manual Part 2

T
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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--91
Table 4--26. OMS Label 352 Discretes
Bit FUNCTION DESCRIPTION
11 MMU Partition Test 0 = Normal, 1 = Fail
12 Over--Temperature Monitor 0 = Normal, 1 = Fail
13 PCI Bus Monitor 0 = Normal, 1 = Fail
14 PCI Bus Configuration Test 0 = Normal, 1 = Fail
15 Power Fail Monitor 0 = Normal, 1 = Fail
16 Power Supply Monitor 0 = Normal, 1 = Fail
17 SDRAM Flash Copy Monitor 0 = Normal, 1 = Fail
18 SDRAM/EDC Test 0 = Normal, 1 = Fail
19 Software Event Log 0 = Normal, 1 = Fail
20 Software Heartbeat Monitor 0 = Normal, 1 = Fail
21--29 Spare 0 = Normal, 1 = Fail
G. TAWS/RWS Discrete Output Data
(1) Ground Discrete Parameters
This section describes the T
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CAS TAWS/RWS ground discrete outputs. The ground
discrete outputs are used to drive alert lamps and are not activated when power is
removed from the LRU. All Ground discretes in this section are dependant on the
aircraft Flight Deck configuration and subsequent ASDB settings.
(a) Alert Prioritization Output 1 -- 4
These discretes exist to inform external LRUs that T
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CAS has a h igher priority
alert. For example, on the input side, if the Alert Prioritization Input 2 Value was
’5’ and the Alert Prioritization Input 2 Discrete became active because an
engine --out condition was detected, the T
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CAS would suppress all of its alerts of
lower priority but still allow output alerts of priority 1 through 4. On the output
side, the T
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CAS would set only the Alert Prioritization Output # discretes to
active whose corresponding values are of lower priority than the alert. Other
LRUs capable of sensing the states of these discretes would suppress their own
alerts of lower priority.
(b) Audio On
The Audio On output discrete is used to inhibit other audio systems (e.g., TCAS)
during GPWS warnings. In addition, it can be used to drive the audio key line
input provided on some aircraft audio systems.
The Audio On discrete is activated whenever any aural message is being
annunciated and it remains activated until the aural message is completed.