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Page Title:
Discrete Inputs to CAU from ANCU |
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|  MIL-N-81604C(AS)
Para 30.5.10.1
.
Appendix I
(cont)
2 (ANCU to CAU) - The ANCU shall transmit
Data
either a 6-bit or 28-bit message to the CAU on
Data 2. The 6-bit request codes, which pro-
vide the basis for CAU operation decisions,
shall conform to table XXIII. The 28-bit data *
words, for internal CAU usage or retransmission
to external avionics, shall conform to table
XXIV . The CAU line receiver shall be a Type D *
circuit.
Busy - Refer to 3.4.4.3.1c(6). The CAU line *
f.
receiver shall be a Type A circuit.
*
Request Ready - Refer to 3.4.4.3.1c(7). The
g.
CAU line receiver shall be a Type A circuit.
30.5.10.2 Discrete Inputs to CAU from ANCU - Four (a thru d)
of the eight available ANCU programmable output discretes shall
be utilized for the E-2C application.
IMU Level - This is a software developed
a.
discrete supplied from the ANCU to the CAU
which goes true (high, open, or ANCU power
off) to indicate that the platform is level.
If the system has been switched into an
attitude backup mode, and the ANCU is still
*
functioning properly, the platform level
signal will be equivalent to the IMU Ready.
*
If the CAU control command discrete has been
received by the CAU, this signal shall be
When the ANCU is operating properly,
ignored.
this discrete may be used to develop the
*
vertical reliability signal. The ANCU line
driver and the CAU line receiver shall be
Type B circuits.
CAU Flag Set - This output from the ANCU to
b.
the CAU shall go to a true (high, open, or
ANCU power off) state to indicate that the
software has detected a malfunction in the
CAU. This signal, when in the true state
for a minimum-of 20 milliseconds, shall
cause the CAU flag to go to the set (no-go)
state if the CAU flag reset signal is not
The ANCU line driver and the CAU
present.
line receiver shall be Type B circuits.
183
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