Specifications

ML-M-D- 147X
5.15.3.3 DisPlaYcoding.
5.15 .3.3.1 ~. Coding shall be employed to differentiate between items of information and to
cal) the user’sattention to changes in the state of the system. Coding should be used for critical
information, unusual values, changed items, items to be changed, high priority messages, special
areas of the display, errors in ermy, criticality of command entry, and targets. Consistent, meaningftd
codes shall be used. Coding shall not reduce legibility or increase transmission time.
5.15 .3.3.2 Flash. Flash coding shall be employed to call the user’s attention to mission critical
events only. No more than 2 flash rates shall be used. Where one rate is used, the rate shall be 3-5
flashes per second. Where two rates are used, the second rate shall be not greater than 2 per second.
5.15 .3.3.3 Britiess. Brightness intensity coding shall be employed only to differentiate
between an item of information and adjacent information. No mom than two levels of brightness shall
be used. Each level shall be separated from the nearest other level by not less than a 2:1 ratio.
5.15 .3.3.4 Pattern and location. Pattern and location coding maybe used to reduce user search
time by testrietirtg the area to be searched to prescribed segments.
5.15 .3.3.5 Underlining, Underlining maybe employed to indicate unusual values, errors in
entry, changed items, or items to be changed.
5.15 .3.3.6 Svmbcdand size. Symbol coding may be used to enhance information assimilation
from data displays. Symbols shall be analogs of the event or system clement they represent or be in
general use and well known to the expected users. Where siz difference between symbols is
employed, the major dimensions of the larger shall be not less than 150% of the major dimension of
the smaller. Not more than three size levels shall be used.
5.15.3 .3.6.1 S~ials
vrnbols. When special symbols are used to signal-critical conditions, they
shall be used for only that pupae.
5.15.3 .3.6.2 Markers close to words maxkcd. When aspccial aymbd is used to mark a word,
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5.15.3.3.7 Color. Color coding may be employed to differentiate between classes of
information in comgde~ dense, or critical displays, The coiora aelectd shall not ccmfiictwith the color
associations specified in Table II. Information shall not be cotkd solely by color if the data must be
aaxssed from monochromatic as well as color terminals or printed in hard copy versions.
5.15.3.3.8 Shine. Shape coding may be used forsettrch and idaotifii wsks. When shape
coding is used, the codes selected shall be based on established standards or conventional meanings.
5.1s,3,3,9 LWahmt=
,tiwr.sicm When ~ mpability fm ?x@tnes$ inversion is available
(so-called “revoraevideo”, where M characters on a
bright bac@mund can be changed under
computer control to bright on dark, or vice versa), it may be treed for highlighting critical items that
require user attention. When u.4 for alerting purposes, brightness inversion shall be reserved for tha!
purj.nw, and nut k d fos general highlighting.
5.15.3.4 Dvnamic displays
~ 1‘134 I Chwwing values. Chancing alphanumeric values which the operator must rehahly
. ... ..
read shall not be updated more often than once per second. changing values wmcn me vlcwcr uw tt1
idrn?ifi raw
of change or tn rratl xmw wtlum shall not be updated faster than 5 times per wxxd, IIW
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wcond. ulwn ttw @713y 1~ [0 k L’VISNIWW iw rwi-tl IIIt’