Gefen EXT-VGA-142N User Manual download pdf (Page 4)

The 1:2 VGA Hub allows computers with VGA graphic cards to display a picture

on two VGA displays or projectors simultaneously, making it perfect for presenta-

tions where the operator uses a small monitor at the computer while the audience

views the image on a second larger display or projector.

How It Works

The 1:2 VGA Hub is connected to a PC video source with a VGA (male to female)

cable from the computer’s VGA graphics card port to the VGA Hub’s input con-

nector.

There are two VGA outputs on the 1:2 VGA Hub. VGA output one is the Primary

connection, which queries the Primary Display attached to it and determines the

possible video resolutions, timings and frequencies that can be used to create a

picture. This information is called EDID (Extended Display Identiﬁ cation Data).

VGA output two is connected to the second (Secondary) display and creates an

image by following the EDID settings obtained from the ﬁ rst (Primary) display;

therefore, both displays should be capable of the same resolutions and refresh

rates in order to display an identical picture. For more information regarding

EDID, please read the Operation Notes immediately below this paragraph.

INTRODUCTION

READ THESE NOTES BEFORE INSTALLING OR

OPERATING THE 1:2 VGA HUB

• Display information (EDID) is not sent back to the source. Standard VESA

resolutions should be output by most computers without the need of an EDID.

If using a non-VESA standard resolution or if EDID is needed, an EDID storage

and relay device is necessary. Gefen recommends the use of a DVI Detective

(part# EXT-DVI-EDID, EXT-DVI-EDIDN, or EXT-DVI-EDIDP) with two VGA to

DVI adapters.

OPERATION NOTES

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Gefen EXT-VGA-142N User Manual Page 4