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|  MIL-N-81604C(AS)
Para 3.4.3.2a
(cont)
Binary 1 = ground:
*
nominally +1 VDC max
at 100 ma max
Binary 1 and O on the clock line to the
AN/ASW-27 are defined as follows:
Binary 0 = open circuit: nominally 1000
*
to ∞ ohms at +12 to +28 VDC
Binary 1 = ground:
nominally +1 VDC max at
*
10 ma max
b. Taxi Discrete - This taxi discrete will be supplied
to the ANCU from the aircraft as an indication to
the computer that the aircraft is moving relative
to the ground or the aircraft carrier deck.
The two wire input shall be a short circuit for
aircraft not moving and open otherwise. The ANCU
input circuit shall be a Type B receiver.
c.
Weight on Wheels Discrete - This discrete shall be
supplied as an indication to the computer that the
aircraft is not airborne. The two wire signal shall
be a short circuit for weight on wheels and an open
circuit otherwise. One of these wires shall be
grounded in the ANCU and the other shall provide the
signal input to a type B receiver. In addition, the
signal wire shall be routed through the ANCU to the
P s u The two-wire signal shall be a short circuit
for the weight on wheels condition, regardless of
the presence or absence of aircraft power, and an
*
open circuit otherwise.
*
3.4.3.3 IMU/External - The IMU shall output two signals which
hay be used to operate an external air valve to control flow of
cooling air through the IMU heat exchanger. Refer to 3.5.1.8.4.
*
he signals shall be transmitted over two lines; an open circuit
will be provided to indicate a closed valve is required.
The
valve open signal is 115 VAC, 400 Hz half-wave rectified, positive
d-c at 250 milliamps maximum.
*
The 250-milliapere load may be either resistive or inductive; if
*
nductive, the switching transient must be suppressed.
nverse rating on the rectified output is 400 volts peak. The
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