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|  MIL-N-81604C(AS)
Para 3.4.4.1
(cont)
.
*
Spare D-C Signals - The ANCU shall accept six spare
j.
*
d-c signals for digital conversion.
3.4.4.2 IMU/CAU Interface - This interface is necessary to pro-
vide IMU input/output signals for use in the various CAU config-
urations which may exist in different aircraft.
a.
Discretes
(1) IMU Ready - This discrete output from the IMU
to the CAU goes to the false (high, open, or
IMU power off) state to indicate that the IMU
is not ready to accept computer control or the
IMU is not level in the attitude reference
mode. The true state of this discrete shall
be used to indicate that the platform is ready
to accept computer control or the platform is
level when in the attitude reference mode.
While in the attitude reference mode, the IMU
shall maintain analog control of the gyros
even after the IMU READY discrete goes true.
This discrete shall go true, when indicating
that the computer should accept control, at
41 2 seconds from ambient temperatures above
-10F. This time may be extended linearly to
96 seconds at -65F. The line driver in the
IMU shall be a Type B circuit.
(2) IMU No-Go - This output from the IMU shall be
*
supplied to indicate that the IMU no-go flag
has been set. When the flag is in a set
(no-go) state, an open circuit shall be sup-
*
plied. When the flag is in a reset (go) state,
*
a ground shall be supplied. The contact
rating of this switch shall be 250 ma resistive
*
or 100 ma inductive at 28 volts d-c.
(3) Flag Reset - The true (high) state of this
input to the IMU shall reset the IMU malfunc-
tion flag to the no-fault state. The false
(low or open) state shall cause restoration
of the fault indicator circuit to its normal
fault monitoring condition. The false
respond in this manner to true or false states
52
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