Advanced Edid Management - Lightware UMX4x4-Pro2 User Manual

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4.2. Advanced EDID management

Each DVI sink (e.g. monitors, projectors, plasma displays, and switcher inputs) must
support the EDID data structure. Source BIOS and operating systems are likely to query
the sink using DDC2B protocol to determine what pixel formats and interface are
supported. HDMI standard makes use of EDID data structure for the identification of the
monitor type and capabilities. Most DVI sources (VGA cards, set top boxes, etc.) will
output DVI signal after accepting the connected sink's EDID information. In case of EDID
readout failure or missing EDID the source will not output DVI video signal. UMX4x4-Pro2
provides Lightware's Advanced EDID Management function that helps system
integration. The built in EDID memory stores and emulates pre-programmed factory
EDIDs, user's EDIDs and all monitor's EDID that is connected to the output connectors.
The router stores the EDID of all attached monitors or projectors for each output in a
non-volatile memory. This way the EDID from a monitor is available when the monitor is
unplugged, or switched off.
Any EDID can be emulated on any input. An emulated EDID can be copied from the
EDID router's memory (static EDID emulation), or from the last attached monitors
memory (dynamic EDID emulation). For example, the router can be set up to emulate a
device, which is connected to one of the outputs. In this case the EDID automatically
changes, if the monitor is replaced with another display device (as long as it has a valid
EDID).
EDID is independently programmable for all inputs without affecting each other. All inputs
have their own EDID circuit. EDID management can be controlled via serial port or
Ethernet.
Info: The user is not required to disconnect the DVI cable to change an EDID as opposed to
other manufacturer's products. EDID can be changed even if a source is connected to the
input and it is powered ON.
Info: When EDID has been changed, the router toggles the HOTPLUG signal for 2 seconds.
Some sources do not observe this signal, so in this case the change is not recognized by
the source. In such cases the source device must be restarted or powered OFF and ON
again.
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„I have changed to a different EDID on an input port of the matrix to have a
different resolution but nothing happens."
Some graphics cards and video sources read out the EDID only after power-
up and later they don't sense that EDID has been changed. You need to
restart your source to make it read out the EDID again.
„I have a UMX4x4-Pro2 and I'm using a Lightware factory preset EDID. I
would like to be able to choose from different resolutions, but my source
allows only one resolution."
Most of the Lightware factory preset EDIDs allow only one resolution, forcing
the sources to output only that particular signal. You need to select a
Universal EDID. It supports all common VESA resolutions. Additionally it
also features audio support.
Section 4. Technologies