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|  MIL-D-81347C(AS)
computer via the
DMS upon receipt of an End of Data (EOD) code
from the computer (last word in the
display buffer).
It shall resume requests for data upon receipt of
the 40 Hz sync signal. The time
between requests
for sequential output data shall be in accordance
with the timing constraints in the
following table.
Computer output timing shall be as described for
Normal Output Data in Appendix I.
MAXIMUM OPERATION TIMES PER WORD
Operation
Execution Time
24 sec nominal
Positioning
550 sec maximum
Circle
Vector
550 sec maximum
140 sec maximum **
Character (regardless of
mode)
5 sec maximum
End of Data
5 sec maximum
No Operation
** l The average Type Character operation time per word shall be
less than 95 microseconds.
Operating Requirements - The following is a description of the
3.5.4.4.3.3
operational requirements of the ADL.
Data Transmission - The ADL shall indicate its readiness to accept
3.5.4.4.3.3.1
data by means of the ODR line being set. Data will be of several categories and thus have unique tim-
ing controls for the various modes of operation. Data will be transmitted in two sequential words:
(1) First Transmission -
(a) Four bits denoting Set Position Mode
(b) `IWO eight-bit fields containing X and Y positioning
(2) Second Transmission -
(a) Four bits denoting Operation Mode
(b) TWO nine-bit fields containing Command Word Data
Function Codes - There are four general types of Function Codes:
3.5.4.4.3.3.2
(1) Set Position Word - Two eight-bit one's complement fields
for X and Y position.
(2) Circle Plot Word - Two eight-bit fields denoting the circle
radius.
(3) Vector or Azimuth Vector Word - Two nine-bit one's com -
plement field X and Y vector components.
(4) Character Plot Word - TWO six-bit fields employed to specify
two characters.
Diagnostics - The ADL shall provide diagnostic data to the com-
3.5.4.4.3.3.3
puter. This data shall be initiated by a Diagnostic Instruction word from the DMS. The Diagnostic
Instruction word shall be transmitted to the ADL via ODR/OA data transfer mode. The diagnostic data
shall be transmitted to the DMS using the IDR/IA mode of data input.
244
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