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RGB Video The video output (analog or digital) of most computers. Analog RGB video can have 3, 4,
or 5 wires - one each for red, green, and blue, and either none, one or two for sync. For
three-wire RGB, the green wire usually provides sync. (See TTL Video).
RS-232 A common asynchronous data transmission standard recommended by the Electronics
Industries Association (EIA). Also called serial communication.
RS-422 A less common asynchronous data transmission standard in which balanced differential
voltage is specified. RS-422 is especially suited to long distances.
S-Video The output from certain video tape players and video equipment. S-Video separates sync
and luminance from color information, typically producing a higher quality display than
composite video.
Scan Frequency The horizontal or vertical frequency at which images are generated.
Scan Line One horizontal line on the display.
SECAM A video output format of some video tape and disc players (used primarily in France).
SECAM (Sequential Couleur á Mémoire) signals are similar in resolution and frequency
to PAL signals. The primary difference between the two standards is in the way color
information is encoded.
Slidebar A slidebar is a graphical display of an adjustable setting. The numerical setting often rep-
resents a percentage but can be a specific unit such as degrees Kelvin.
Source The device, such as a computer or VCR, connected to the projector for display. A source
is identified at the projector as , , , or , or as other user-defined num-
bers. A source may have numerous corresponding channels defined and recognized by the
projector. See Input.
Source Setup See Channel.
Spot Size The diameter of the smallest dot that can be generated by a CRT projector. This projector
has a fixed spot (pixel) size.
Sync This term refers to the part of the video signal that is used to stabilize the picture. Sync
can occur in three forms:
1) "Composite sync": the horizontal and vertical components are together on
one cable.
2) "Sync-on-green": the sync is part of the green video.
3) "Separate sync" or "H.SYNC and V.SYNC": the horizontal and vertical
components of the sync are on two separate cables.
Sync Width The duration of each sync pulse generated by a computer. The sync width is part of the
blanking time.
TTL Video A type of RGB video with digital characteristics.
Terminated A wire connecting a single video source to a display device, such as a projector, must be
terminated by a resistance (usually 75Ω for video).
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GLOSSARY