Gefen EXT-DVIKVM-441DL user manual Edid Modes, What is Edid and what is it used for?

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EDID MODES

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 tailor its output to create resolutions and/or features that are compatible with the attached device/display. This capability information is called EDID (Extended Display Identification 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 4x1 DVI KVM DL/SL Switcher

The 4x1 DVI KVM 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 4x1 DVI KVM DL/SL Switcher to insure that EDID is recorded and retransmitted properly, otherwise display of the input sources might not occur correctly (or at all).

Managing EDID with the 4x1 DVI KVM DL/SL Switcher

The 4x1 DVI KVM DL/SL Switcher uses 2 modes for routing EDID. They are:

1.When the local EDID Mode is ON, (factory default setting) the Switcher copies the EDID of the connected display to the local memory location as they are selected. Each device must fully “boot up” before you can select the next input. The connected device derives EDID information from the local memory location.

2.When the local EDID Mode is OFF, each time a new source device is selected, the Switcher connects EDID from the attached display to the currently selected input source.

Both modes are described in greater detail on the opposite page.

NOTE: The 4x1 DVI KVM 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 4x1 DVI KVM DL/SL Switcher?

There is a bank of 4 DIP (Dual Inline Package) switches located on the main circuit board of the Switcher underneath a small piece of silver grey tape on the underside of the Switcher. When the sticker is removed, there will be two DIP switch banks visible, one with 4 switches and one with 8 switches. The 8-switch DIP switch bank is not used here (it is used for the DL (dual link) feature covered later on page 12.)

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Contents 4x1 Dvikvm DL/SL Switcher Technical Support Asking for AssistanceTechnical Support Hours Write ToContents Introduction Gefen 4x1 DVI KVM DL/SL SwitcherGefen How It WorksOperation Notes Features FeaturesPackage Includes Front Panel Back Panel Panel LayoutPanel Descriptions How to Connect the 4x1 DVI KVM DL/SL Switcher Connecting and Operating the 4X1 DVI KVM DL/SL SwitcherWiring Diagram for the 4x1 DVI KVM DL/SL Switcher LED Indicator Input Selection Buttons RMT-4IR Remote Control DescriptionEmpty Battery Slot IR Code Dip Switches 4X1 DVI KVM DL/SL Switcher Remote InstallationHow to Resolve IR Code Conflicts RMT-4IR Remote and 4X1 KVM Switcher ConfigurationManaging Edid with the 4x1 DVI KVM DL/SL Switcher What is Edid and what is it used for?Edid Modes Edid Lock Mode DIP Switch 4 = on Local Edid Mode OFF Switch 3 = onEdid Modes FunctionDL Dual Link Only Mode Switch=ON DL Dual Link and SL Single Link Mode Switch=OFF DefaultDL Dual Link only Modes DL Dual Link Only ModesWhat are the RS-232 communications port settings? How do I use these features?RS-232 Serial Control RS-232 Features RS-232 Serial Control CommandsFunctions Syntax Function Description#EDIDDSTOBA Function #EDIDDSTOLO Function#EDIDBATOLO Function #DDCTOLO Function #DDCTODS Function#DEF Function #LOEDIDTOBA param1 param2 param3 #LOEDIDTOBA Function#PRBAEDID Function #LOEDIDTOLO Function#PRLOEDID Function #PRDSEDID FunctionInput Binary Command DescriptionHYPERTERMINALtm Settings in Microsoft Windowstm Using SHORT-CUT Characters to Change SettingsRack Mount Installation 5V DC SpecificationsProduct Registration WarrantyPage Page Page Rev A6 Nordhoff St., Chatsworth CA