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Set Position Word Control Field |
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|  MIL-D-81347C(AS)
numbers. The octal representation of the one's complement binary number extends from octal 777 to
octal 400, corresponding to minus zero and minus 377 octal respectively.
Inhibit Control - In the Plot or Set word the Inhibit Control (I),
3.5.3.4.1.4.3.1.3
bit 1, shall provide for either displaying or not displaying the Plot or Set word command (i.e. if a
Set word and an Inhibit bit are received, the display operation associated with that Set word is inhibited.)
A logic "1" indicates an Inhibit operation while a logic "O" indicates normal operation.
Flash Control - In both the Plot and Set Position Words, bit 2
3.5.3.4.1.4.3.1.4
shall provide for flashing either the plot character or the first character of a type sequence. The
flashing shall be at a one Hz rate; one-half second on, one-half second off. The code "0" shall call
for a steady presentation whereas the code "1" shall cause the MPD Logic to flash the proper character
at the prescribed rate.
Plot Character - In the Plot Word the character (CHAR) to be
3.5.3.4.1.4.3.1.5
presented from the Character Matrix shall be selected by the six-digit binary number in bit positions
15 through 20 inclusive. The octal code for character selection is shown in Figure 96.
Bits "O" and "5" - In both the Plot Word and Set Position Word
3.5.3.4.1.4.3.1.6
the function of bits "O" and "5" shall be unassigned.
Set Position Word Control Field - The Set Position Word Control
3.5.3.4.1.4.3.1.7
Field shall be composed of the six bits from bit position 15 through bit position 20 inclusive. The Con-
trol Field codes and associated display operations are shown below:
Display Operation
Control Field Code (Octal)
.
No Display Operation
00
01
No Display Radar Scan Converter Outputs
Display LLLTV Outputs
02
Display Spare Scan Converter Outputs
03
04
Display Ftmction Generator Outputs
05
Display Vector
06
Display Normal Type Sequence
07
Display Short Type Sequence
10
End of Data
11
Display Raw Radar Video
40 Hz Sync
12
13
57.1 Hz Sync
(1) Control Field Code 01 - The Set Position Word Control Field
Code 01 shall cause the Logic to enable the MPD to display the radar information being stored by the"
Radar Scan Converter. The X and Y coordinates of the Set Position Word having a Control Field Code
01 shall cause the X and Y Deflection circuits to center the radar presentation on the specified X and Y
coordinates.
(2) Control Field Code 02- The Set Position Word Control Field
Code 02 shall cause the Logic to enable the MPD to display the signals from the LLLTV. The X and Y
coordinates of the Set Position Word having a Control Field Code 02 shall control the X and Y Deflection
circuits to center the presentation on the specified X and Y coordinates (normally expected to be 000
and 000 respectively). When in the LLLTV mode, no EOD word shall be sent to the MPD.
169
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