Runco Vx 80d Projector User Manual

93Runco VX-40d/-50d/-60d/-80d Owner’s Operating Manual
Glossary
APPENDIX A
This appendix defines the specific terms used in this manual as they apply to this projector. 
Also included are other general terms commonly used in the projection industry.
Active Line Time ➤The time, inside one horizontal scan line, during which video is generated.
Ambient Light Rejection ➤ The ability of a screen to reflect ambient light in a direction away from the “line of best 
viewing”. Curved screens usually have good...

94Runco VX-40d/-50d/-60d/-80d Owner’s Operating Manual
Appendix A: Glossary

Color Temperature ➤
The coloration (reddish, white, bluish, greenish, etc.) of white in an image, measured using 
the Kelvin (degrees K) temperature scale. Higher temperatures output more light.
Component Video ➤See YCbCr or YPbPr.
Composite Video ➤The output of video tape players and some computers, characterized by synchr
onization, 
luminance and color signals combined on one output cable.
Contrast (ratio) ➤The degree of...

95Runco VX-40d/-50d/-60d/-80d Owner’s Operating ManualAppendix A: Glossary

Gain or Screen Gain ➤
The ability of a screen to direct incident light to an audience. A flat matte white wall has 
a gain of approximately 1. Screens with gain less than 1 attenuate incident light; screens 
with gain more than 1 direct more incident light to the audience but have a narrow viewing 
angle. For example: An image reflecting off a 10 gain screen appears 10 times brighter 
than it would if reflected off a matte white...

96Runco VX-40d/-50d/-60d/-80d Owner’s Operating Manual
Appendix A: Glossary

Appendix A: Glossary
Line of Best Viewing ➤
When light from a projector is incident on a screen, the light reflects from the screen such 
that the angle of reflection equals the angle of incidence. The Line of Best Viewing is along 
the line of reflection.
Loopthrough (Loopthru) ➤The method of feeding a series of high impedance inputs from a single video source with a 
coaxial transmission line in such a manner that the line is...

97Runco VX-40d/-50d/-60d/-80d Owner’s Operating ManualAppendix A: Glossary

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).
RS232 ➤
A common asynchronous data transmission standard recommended by the Electronics 
Industries Association (EIA). Also called serial communication.
RS422 ➤A less...

98Runco VX-40d/-50d/-60d/-80d Owner’s Operating Manual
Appendix A: Glossary
Vertical Offset ➤
The difference between the center of the projected image and the center of the projector 
lens. For clarity, offset is often expressed as the maximum amount of the image that can 
be projected above or below the lens center without degrading the image quality. Vertical 
offset ranges depend on the type of lens in use, and whether or not the image is offset 
horizontally at the same time.
Video ➤The signal that...

99Runco VX-40d/-50d/-60d/-80d Owner’s Operating Manual
A serial link of RS232 or RS422 enables ASCII communication with the projector so that it 
can be controlled remotely from a PC or other controller. From a PC, connect a standard 
9-wire RS232 serial cable to the RS232 IN port. Or, for long-distance (>100 ft.) links with 
an RS422-compatible PC or controller, connect RS422 cable to the 
RS422 port.
Serial Communications Cables
APPENDIX B
From projector to DHD Controller (RS232)
From projector to...

100Runco VX-40d/-50d/-60d/-80d Owner’s Operating Manual
Appendix B: Serial Communications Cables
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101Runco VX-40d/-50d/-60d/-80d Owner’s Operating Manual
Throw Distance
APPENDIX C
Calculating Throw Distance
It  is  important  throw  distance  be  precisely  calculated  for  your  installation  using  the 
appropriate formula from the chart below. To calculate throw distance you must know the 
screen size and the lens type installed in the projector. In general, the larger you want the 
image to be the greater the distance you must allow between the lens and the screen.
NOTES: 1) Throw distance is...

102Runco VX-40d/-50d/-60d/-80d Owner’s Operating Manual
Appendix C: Throw Distance
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