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|  MIL-N-81604C(AS)
Para 3.4.4.3.5
(cont)
c.
Serial Data to CIU - Refer to 3.4.4.4.a(3). This "
signal shall be received from the CAU and retrans-
mitted by the ANCU. The line receiver in the ANCU
shall be a Type A circuit.
d.
Serial Data from CIU - Refer to 3.4.4.4a(4).This
signal shall be received and retransmitted to
the CAU by the ANCU. The line driver in the ANCU
shall be a Type A circuit.
e.
Enter - Refer to 3.4.4.4d. This signal shall be
*
received and retransmitted to the CAU by the ANCU.
The line driver in the ANCU shall be a Type A
circuit.
3.4.4.3.6 CIU No-Go - Refer to 3.4.4.4c. This signal shall be
*
routed through the ANCU from the CIU.
3.4.4.3.7 Heading Slew - Refer to 3.4.4.4b. This signal shall
*
be routed through the ANCU from the CIU.
3.4.4.4 CIU Interface - Except where noted, the CIU shall be
under control of the ANCU or the CAU. The ANCU shall control
the CIU whenever self-test determines that the ANCU is capable
of proper control. The CIU shall communicate with the CAU
through line receivers and line drivers in the ANCU in order to
enter and display latitude and magnetic variation in the attitude
reference modes when the ANCU is inoperative. The CIU to CAU
transmission path through the ANCU shall be operational even
when all ANCU power is off, except for +5 VDC power to the CIU
a.
Serial Communication- Digital data shall be trans-
mitted between the CIU and the ANCU or CAU consisting
of BCD data words for numeric displays (e.g. ,
latitude) a discrete data word for switch positions
(Command Word), and a discrete data word for annun-
ciator lamps (Status Word). See figure 14 for the
*
serial communication timing diagram. See figure 15
*
for the serial data format.
(1) CIU Clock - This clock input to the CIU shall be
supplied by the controlling unit. It shall be
a continuous clock with a frequency no greater
than 500 KHz from the ANCU and no greater than
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