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|  MIL-N-81604C(AS)
Para 3.4.4.3.1c(5)
(cont)
of the particular aircraft requirements
and the program in the ANCU.
The following are examples of the type
of information which may be transmitted:
*
(a) Inertially-derived velocity
*
(b)
Aircraft heading
*
(c)
Present position latitude
*
(d)
Magnetic variation
*
(e)
CAU mode control
*
(f)
Built-in-test information
The ANCU line driver shall be a Type D
circuit.
Busy - The true state of this signal
(6)
shall inform the CAU that the ANCU is
busy with interleave or interrupt. The
ANCU line driver shall be a Type A circuit.
Request Ready - The true state of this
(7)
signal shall inform the CAU that the ANCU
has information ready to send or that the
ANCU desires information. The ANCU line
driver shall be a Type A circuit.
ANCU Output Discretes
3.4.4.3.2
Programmed Discretes - There shall be eight
a.
discrete outputs from the ANCU which are con-
trolled separately from the computer progrm.
Their function depends upon the particular pro-
gram which is contained in the ANCU. The eight
discrete outputs shall be Type B circuits.
CAU Control Command - This discrete from the ANCU
b.
to the CAU shall go to a true (high, open, or
ANCU power off) state to indicate that the CAU
should take control of the CIU and that the CAU
should take control of mode determination and
supply sine latitude/magnetic slave heading error
torquing to the IMU azimuth gyro if the magnetic
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