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| MIL-N-81604C(AS)
Para 3.4.3.2a
(cont)
The ANCU shall output a "Data Link Discrete"
(2)
to the aircraft. When this discrete is true
(+28 VDC), the ANCU shall accept align data
from the data link receiver. When the Data
Link Discrete is false, the ANCU shall accept
waypoint data from the data link receiver.
True = +28 VDC 5% at 150 ma max
False = open circuit (nominally >100K ohms)
The ANCU shall accept information from the
(3)
AN/Asw-25 over 43 lines, consisting of 42
*
parallel data lines (format in accordance with
documents specified in (1) above) and one data
ready line. The data ready line' becomes a
binary O for 200 10 s while the data on the
*
data lines are changing, and is a binary 1 at
*
other times. The data change each 16 ms
nominally. Binary 1 and binary O are defined
as follows:
*
nominally 56 a
Binary O = open circuit:
max at 28 VDC
*
nominally +1V max
Binary 1 = ground:
at 10 ma max
The ANCU shall accept information from the
(4)
AN/ASW-27 over 2 lines, the serial data line,
and the data ready line, and shall provide a
clock to the ASW-27 over the clock line. Each
*
16 ms (nominally), the data ready line shall
become a binary O for 200 s. Otherwise it is
*
a binary 1. Within 1.0 ms, the ANCU must clock
in the 42 bits of data from the AN/ASW-27 at a
maximum rate of 1.0 MHz. The clocking is ac-
complished on the transition from a binary O to
a binary 1. The clock pulse width shall be
greater than 400 nsec. Binary 1 and binary O
on the serial data line and the data ready line
from the ASW-27 are defined as follows:
*
nominally 56 a
Binary 0 = open circuit:
max at 28 VDC
31
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