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|  MIL-N-81604C(AS)
Para 3.5.5.4j
(cont)
of magnetic variation in the right display.
The ANCU requests waypoint information from
the Data Link (AN/ASW-27 or AN/ASW-25)
during alignment and prior to computer control
of the IMU. In order to allow the operator
to check whether any waypoint information, in
fact, has been received, a number from O to 10
shall appear in the left display to indicate
the number of waypoints received.
k. AUX - The function of this DATA switch posi-
tion shall be to take advantage of the flexi-
bility of the ANCU's general purpose computer
to provide new entry and display functions as
desired without modifying the CIU. The AUX
switch position shall be expanded into 10
entry and display positions by use of the
WAYPOINT pushbutton to provide the 0 thru 9
selectable subpositions. Waypoint sup-
position 4 is dedicated to display carrier
vertical lever arm in the CIU left display
and aircraft true heading in the CIU right
display.
3.5.5.5 Keyboard - The keyboard shall consist of 10 pushbuttons
which are used for number entry, the CLEAR pushbutton, and the
ENTER pushbutton. The L\7 and R/9 pushbuttons shall serve dual
functions. At the start of any data entry cycle, one or the
other of these pushbuttons must be depressed. This is a signal
to the CIU that data are going to be entered in either the left
(L) display or the right (R) display. The dual function of the
N/2, W/4, E/6, and S/8 pushbuttons shall allow for selection of
sign or direction.
The ENTER pushbutton shall be used to signal the computer that it
should accept the entered keyboard data which has been temporar-
ily stored in the CIU.
Depressing the CLEAR pushbutton shall be used to take the CIU out
*
of the data entry mode if the data have not yet been inserted
into the computer. This shall reject data entry and return the
CIU to its normal display mode of operation without modifying
computer memory locations.
124
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