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|  MIL-D-81347C(AS)
(g) Enable Analog Video -4 pairs
(h) Vector Slope - 9 pairs
(i) Major Axis -1 pair
(j) X and Y Sign -2 Pairs
(k) Frame and Word Sync - 2 pairs
A logical "O" shall be 4 +1 volts, a logical "l" shall be O +0.5,
-0.0 volts. Transition times shall be less than one microsecond when measured at the 10% and 90%
amplitude points.
(2) Single Ended Transmissions
(a) Switch Common - This line shall be the common refer-
ence for the Operation Mode and Off- Line/Analog Mode Switches and shall have no other connection
within the M PD.
(b) Operation Mode Switch - The three coded lines going to
the MPD Logic shall have no internal connection within the MPD.
(c) Off-Line/Analog Switch - The two coded lines going to
the MPD Logic shall have no connection within the MPD.
(d) Overflow Indicator - The two lines transmitted to the
Overflow Indicator shall be 5
0.5 volts at 150 milliamperes maximum and the overflow active signal
where "open" represents light
''off" and 0 0.5, -0.0 volts represents light "on". These signals
within the MPD. The 5 +0.5 volts at 150 milliamperes maximum shall
shall have no other connection
be referenced to the overflow
active line.
(3) Triaxial Transmissions - All coaxial transmissions shall be
via Amphenol 421-033 cable or equivalent terminated in a differential amplifier with an input im-
pedance of 90 to 95 ohms and 100 picofarads maximum. The following signals shall be transmitted via
triaxial cables.
(a) Vector Unblank
(b) Sweep Enable
A logical "O" shall be 0 + 0.5, -0.0 volts, a logical "1" shall be
5 +1 volts. Transition times shall be less than 100 nanoseconds when measured at the 10% and 90%
points. Triaxial cable lengths shall not exceed 100 feet.
Word Formats
3.5.3.4.1.4.3
Computer Output Signals - Output signals from the computer are
3.5.3.4.1.4.3.1
in the form of a 30-bit parallel binary word. Word formats are shown in Figure 95.
Function Code - The Function Code of the Set or Plot word is
3.5.3.4.1.4.3.1.1
used to identify that word. The function code designator is located in bit positions 4 and 3. The
function code "01" shall designate the Plot function while the function code "10" shall designate the
Set function.
X and Y Position Fields - The X and Y position fields are used
3.5.3.4.1.4.3.1.2
only when a Plot or Set word has been received. The nine bit binary numbers located in each one of
these fields shall be suitable for commanding the X and Y axis deflection circuits, in the MPD, to
place the electron beam on the viewing screen of the MPD. The nine-digit binary numbers are repre-
sented by three-digit octal numbers. The positive number scale extends from zero to a maximum of"
377 octa!. Negative binary numbers are represented by corresponding one's complement binary
168
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