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|  MIL-N-81604C(AS)
3.4.3.4 Aircraft Electrical Power - The equipment shall utilize
aircraft electrical power as stated in 3.3.12.
3.4.3.5 CIU Entry/Display - Refer to 3.5.5.4.
3.4.4 Equipment Internal Interface - The CAINS interface of
signals between the units is presented in figure,5. Table VI.
(receiver) and VII (driver) describe interface circuit types A
through E referenced in the following paragraphs.
3.4.4.1 IMU/ANCU Interface - Digitally, the IMU shall supply
incremental velocity and clock pulses to the ANCU, along with
status discretes and calibration data. Accoordingly, the ANCU
shall perform the required platfom management by supplying
binary gyro torquing pulses and control discretes to the IMU.
Transfer of all digital data between the IMU and the ANCU shall
be controlled by the computer program. The IIMU and the ANSU SHALL
pitch and roll in synchro form and heading in resolver form to
the ANCU. In addition, the IMU shall be mechanized to output
*
temperature monitor signals in d-c form.
Platform Discrete Outputs (IMU to ANCU) - The IMU
a.
shall provide five discrete outputs to the ANCU
which denote the operational status of the platform.
In addition, two programmable spare Type B receivers *
in the ANCU may be utilized if necessary.
Accelerometer Coarse Heater On - This discrete
(1)
output from the IMU to the ANCU shall go to
the true (high, open, or IMU power off) state
to indicate that the accelerometer coarse
heater is on. The line driver in the IMU and
the line receiver in the ANCU shall be Type B
circuits.
Gyro Coarse Heater On - This discrete output
(2)
from the IMU to the ANCU shall go to the true
(high, open, or IMU power off) state to indi-
cate that the gyro coarse heater is on. The
line driver in the IMU and the line receiver
in the ANCU shall be Type B circuits.
Gyro Float Temperature - This discrete output
(3)
from the IMU to the ANCU shall go to the true
(high, open, or IMU power off) state to indi-
cate that the gyro float is up to operating
temperature. The line driver in the IMU and
the line receiver in the ANCU shall be Type B
circuits.
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