Extron Electronics System 5cr - Manual (Page 37)

Appendix B • Reference
Extron • System 5cr Switcher • User’s Manual B-4
the associated (learned) command is then transmitted through an IR emitter or
broadcaster to the projector, where it is executed. For example, if input #3 is
S-video, selecting that input also sends a signal to the projector to switch to
S-video mode. See IR library.
IR Library –
A library of infrared commands for video projectors that can be used with Extron’s
System 5 switcher. Each library file has a set of commands for a specific
projector, or series of projectors. The files are available at Extron’s web site and
for uploading to the System 5 memory. Once installed, appropriate IR commands
are assigned to operational functions, which are transmitted when that function is
activated, allowing the System to control the projector. See IR learning.
Latching –
For a device that has two states, such as a relay or a switch, latching means that
once put into the active state, the condition remains until it is taken out of that
state by some action. Often the same action latches and unlatches alternately. In
the System 5, the Room relay can operate in two modes: latching or momentary.
LCD –
Liquid crystal display – A panel that utilizes two transparent sheets of polarizing
material with a liquid containing rod-shaped crystals between. When a current is
applied to specific pixel-like areas, those crystals align to create dark images. The
dark areas are combined with light areas to create text and images on the panel.
LCD panels do not emit light but are often backlit or side-lit for better viewing.
LCD panel –
A device used to project video images through a liquid crystal display and an
overhead projector onto a large screen. The panel is placed over the stage of an
overhead projector, projecting the computer display onto a screen.
LCD projector –
Utilizing the LCD technique, these projectors separate the red, green and blue
information to three different LCD panels. Since LCD panels do not produce
color, the appropriate colored light is then passed through each panel and
combined to exit through the projector lens and onto a viewing screen.
Level (audio) –
A term used with signal voltage, power, strength or volume. Audio level can be
expressed as attenuation (less than the original) or gain (more than original).
Library –
See IR Library.
Luma –
This is the signal that represents brightness in a video picture. Luma is any value
between black and white. In mathematical equations, luma is abbreviated as “Y”.
Relay –
In the System 5, a “room” function controlled from the front panel or by a remote
device, which provides normally open and normally closed contacts to a
connector, allowing the user to control other electrical devices.
RGB Delay –
When switching between video inputs, for a brief time, the signal out of the
switcher may be unstable while locking in on the new sync. RGB delay turns the
video on after the sync has stabilized, providing seamless switching.
Room (control) –
The “room” function controlled from the System 5 front panel or by a remote
device provides relay contacts to a connector, allowing the user to control other
devices electrically. Examples include window blinds, lighting, projection screen.
RS-232 –
A method of communicating between two devices using two lines: Tx to transmit
and Rx to receive. Tx on one end becomes Rx on the other. This standard does
not specify balanced control lines.
Serial Port –
A connection that allows communication with other devices over a single pair of
wires. The serial port is most often used with RS-232 protocol.
S-video –
The composite video signal is separated into the Luma (Y) and the Chroma (C).
Y –
In video, “Y” is an abbreviation for Luma.