Gefen EXT-DVI-841DL User Manual download pdf (Page 13)

EDID NOTES

What is EDID and what is it used for?

Under normal circumstances, a computer source device (digital or analog) will

require information about a connected device/display to assess what resolutions

and features (capabilities) are possible. The source device can then cater its

output to create resolutions and/or features that are compatible with the attached

device/display. This capability information is called EDID (Extended Display

Identiﬁ cation Data). A source device can only accept and read one EDID data

structure/record from a connected source device/display. Likewise, the source

device can output only one video resolution to a connected device/display.

The importance of EDID with regards to the 8x1 DVI DL/SL Switcher

The 8x1 DVI DL/SL Switcher handles multiple sources/inputs. Each connected

source device must correctly read one EDID data structure in order to address its

display device correctly. EDID management is carefully handled by the Switcher

to insure that EDID is recorded and retransmitted to sources properly at all times,

otherwise display of input sources might not happen correctly (or at all).

Managing EDID with the 8x1 DVI DL/SL Switcher

The 8x1 DVI DL/SL Switcher has the ability to use 2 modes for routing EDID.

1. The default mode is the LOCAL mode which will store the EDID of a source

device (one for each input) into the 8x1 DVI DL/SL Switcher. The EDID

stored in each LOCAL location can be from a local display device or from

a remote source over the RS-232 serial communications port. The 8x1 DVI

DL/SL Switcher also includes a built-in EDID memory bank which can store

up to 7 separate EDID data structures which can then be loaded to each of

the LOCAL EDID locations.

2. The second mode is the DS (Down Stream) mode which functions as a

simple EDID pass-through. In this mode, the display device connected to the

8x1 DVI DL/SL Switcher will pass its EDID directly to whichever DVI input

source is currently selected. HDCP is supported in this mode only.

NOTE: The 8x1 DVI DL/SL Switcher also features an EDID Lock Mode,

allowing the EDID to be stored. See the following page for details.

How do I change EDID modes in the 8x1 DVI DL/SL Switcher?

There is an bank of 4 DIP switches located on the main circuit board on the

underside of the 8x1 DVI DL/SL Switcher. DIP switch 3 can be used to set either

the DS or LOCAL EDID modes. The bank of 8 DIP switches are used for the DL

(dual link) only feature and are explained on page 12.

TIP: Advanced EDID functions can also be managed via the RS-232 serial

communications port. See page 13 for more information on the RS-232 serial

communication features.

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Gefen EXT-DVI-841DL User Manual Page 13