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|  MIL-N-81604C(AS)
Para 3.4.4.4b
(cont)
(3) Headinq Slow Slew - In the CIU, the heading
*
slow slew line shall be connected to the
*
heading slew return line when slewing at
either the DCR or INCR low slew rates. Refer
*
to Appendix I, as the slew rates are a function
of the aircraft unique CAU.
CIU No-GO - This output from the CIU routed through
c.
the ANCU to the CAU shall be supplied to indicate
that the CIU malfunction flag has been set. When
*
the flag is in a set (no-go) state, a short circuit
shall be supplied to the CAU. When the flag is in
*
the reset (go) state, an open circuit shall be
supplied to the CAU. This switch output shall have
a minimum current rating of 250 ma resistive and
*
100 ma inductive at 28 volts d-c.
Enter - Depressing the ENTER pushbutton shall gener-
d.
*
ate a true (high) pulse which is two clock pulses
in width. This pulse shall be used as an interrupt
input to the ANCU. This pulse shall also be trans-
mitted to the CAU. The line driver in the CIU and
the line receiver in the ANCU shall be Type A
circuits.
Position Fix (POS FIX) - Depressing the POS FIX
e.
pushbutton shall generate a true (high) pulse which
*
is two clock pulses in width. The pulse whiich
used as an interrupt input to the ANCU. The CIU
line driver and the ANCU line receiver shall be
Type A circuits.
Flag Reset - The true (high) state of this input to
f.
the CIU shall reset the CIU malfunction flag to the
no-fault state. This signal shall be routed through
the ANCU from the CAU. The false (low or open)
state shall cause restoration of the fault indicator
circuit to its normal fault monitoring condition.
The CIU shall respond in this manner to true or
false states which occur for a minimum of 20 milli-
seconds. The line receiver in the CIU shall be a
Type C circuit.
75
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