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|  MIL-N-81604C(AS)
3.4.4.3.3
ANCU
Input
Discretes
a. Programmed
Discretes - There shall be seven dis-
crete inputs to the ANCU which are transmitted
directly to the computer for use by the program.
The ANCU line receivers shall be Type B circuits.
Flag Reset - The true (high) state of this input
b.
to the ANCU shall reset the ANCU malfunction flag
to the no-fault state. The false (low, open, or
CAU power off) state s h a l l
respond
in
the fault indicator circuit to its normal fault
monitoring condition. The ANCU shall respond in
this manner to true or false states which occur
for a minimum of 20 milliseconds. The line
receiver in the ANCU shall be a Type C circuit.
CAU Fail - This Output from the CAU to the ANCU
c.
is also routed through the ANCU to the CIU and
shall go to a true (ground or open) state to
(1) cause
perform the following two functions:
*
the CAU malfunction indicator on the CIU to
illuminate , and (2) notify the computer that a
The line receivers
CAU malfunction has occurred.
in the CIU and ANCU shall be Type C circuits.
Synchro Excitation - Excitation shall be provided from
3.4.4.3.4
the CAU (if part of the system) or aircraft fot the use as arefer-
ence on the ANCU A/D converters. The excitation shall be 26, VAC,
This reference signal must be in phase and from the
400 Hz.
same source as the excitation provided to the
excitation
*
3.4.4.3.5 CIU Back Up Signals - In the event that the ANCU is
*
shall
unable to communicate with the CIU, signals listed below
*
allow the CAU to provide limited CIU control. See fig. 14
for the serial communication timing diagram.
*
This signal
CIU Clock - Refer to 3.4.4.4a(1).
a.
shall be received from the CAU and retransmitted
The line receiver in the ANCU shall
by the ANCU.
be a Type A circuit.
Control - Refer to 3.4.4.4a(2). This signal shall *
b.
be received from the CAU and retransmitted by the
The line receiver in the ANCU shall be a
ANCU.
Type A circuit.
65
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