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|  MIL-D-81347C(AS)
(2) Function Code (03) - This will be a one character word
message which indicates a point is to be plotted at the X, Y position defined in the previous position
word. The leading edge of the first character will be drawn O. 25 inch to the right of this point. When
only the second character is to be displayed, its leading edge will be O. 5 inch from the point.
(3) Function Code (04) - This code will signify that a multi-
character message is to be processed (Type Format). The lower left hand corner of the initial char-
acter will be O. 25 inch to the right of the X, Y position defined in the previous positioning word, or
previous word containing a Function Code 04.
3.5.4.4.3.5.1.1.4
Vector Word - The Vector Word (Figure 144) will contain the
data necessary to define both the normal vector and azimuth vector. The X component of the vector
will be contained in bits 15 through 23, with bit 23 as the MSB and bit 15 as the LSB. The Y component
will be contained in bits O through 8, with bit 8 as the MSB, and bit 0 as the LSB.
(1) Function Code (05) - This code will signify that the data ac-
companying the code will define a vector. The center of the vector will be defined by the X, Y coordi-
nates contained in the previous word. Both ax and ay will be 9 bit, one's complement quantities. The
LSB = 1/2 set position bit.
(2) Function Code (06) - This code will be used when an aircraft
heading vector is to be displayed. The X, Y coordinates contained in the previous word will be that of
the aircraft. A four-inch vector whose angular orientation is that of the aircraft heading vector will
be programmed in the accompanying data. The resultant displayed vector shall be one-half inch long,
originating from the Aircraft Symbol, and extending in the programmed direction. A Function Code
(06) shall be able to follow a Function Code (02) without regenerating a new Set Position word (Function
Code (01)).
3.5.4.4.3.5.1.1.5
Circle Word - Function Code (07) - The Circle word, Figure 145,
will contain the necessary data for defining a circle. The radius defining this circle will be contained
in bits O through 7 and 15 through 22, with bits 7 and 22 as the MSB's and bits 0 and 15 as the LSB's.
This word will specify a circle centered on the X, Y coordinates contained in the previous Positioning
word. The radius in this word will always be an eight-bit, positive quantity, where 377 in the octal
code represents one display diameter. The binary equivalent for radius will be identical in both halves
of the data word.
3.5.4.4.3.5.1.1.6
End of Data Word - Function Code (10) - This code will indicate
the End of Data (EOD) from the computer during a particular 25 millisecond frame. If the EOD word
is not received: the Auxiliary Display, upon reinitialization, shall continue to display the remaining
buffer information during the next 25 millisecond frame.
3.5.4.4.3.5.1.1.7
Flashing Character - Function Codes (12), (13), and (14) - Codes
(12), (13), and (14) will signify that all character data accompanying codes (02), (03), and (04),
respectively, shall be displayed in the Flashing Mode. Flashing shall be accomplished by displaying
the information for one-half second, and then preventing the display of this information for the next
half second, by inhibiting the Z axis (video) output.
3.5.4.4.3.5.1.1.8
Character Size - The ADL shall provide controls which will en-
able an operator to continuously vary the size of the characters displayed. Character height and width
shall be continuously adjustable from 1/8 to 1/4 inch.
3.5.4.4.3.5.1.2
Diagnostic Instruction Word - The Diagnostic Instruction Word
will be indicated by a logic "l" in bit 14. The remaining bits will be used to describe the diagnostic
test mode as needed (Figure 146).
3.5.4.4.3.5.2
Input Word Formats - The Auxiliary Display Logic shall generate
frame start and diagnostic data words to the computer via the DMS.
3.5.4.4.3.5.2.1
Frame Start - The frame start word as described in
3.5.4.4.3. 5(4) shall contain no data on the input data lines.
250
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