User`s manual

EDID NOTES

What is EDID and what is it used for?

Under normal circumstances, an audio/video 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 Switcher

The 8x1 DVISwitcher 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 8x1 DVISwitcher

to insure that EDID is recorded and retransmitted properly, otherwise display of

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

Managing EDID with the 8x1 DVI Switcher

The 8x1 DVISwitcher 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 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 Switcher

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 Switcher will pass its EDID directly to whichever DVI input source is

currently selected.

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

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

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

or LOCAL EDID modes.

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.