Extron electronic 68-388-01 manual Lcd

Appendix B • Reference

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.

Extron • System 5cr Switcher • User’s Manual B-4