Extron Electronics DVI DA Plus Series User Guide - Manual (Page 14)

EDID Minder
When a DVI video source boots up, it normally communicates with the output device using
the bidirectional Extended Display Identification Data (EDID) communication protocol. The
source device then produces a signal with a resolution that is compatible with the output
device.
The Extron EDID Minder feature maintains continuous EDID communication with the
attached source and ensures that the DVI source powers up correctly and maintains a proper
video output even if the display is off, or when a new monitor is connected to the output.
In default mode, when the distribution amplifier is powered on, it automatically scans all
detectable outputs, selects the device with the lowest native resolution and passes the EDID
information from that device to the input device.
While the distribution amplifier remains powered on, it monitors the Hot Plug Detect (HPD)
signal on each output and repeats the scan process every time a display is connected or
disconnected.
If all outputs displays are removed, the EDID provided is that of the last stored display to
which the distribution amplifier was connected. If no output device has previously been
connected to the unit, or the unit has been through a power cycle with no displays attached,
the EDID uses the factory default, reporting a native rate of 1024x768.
When the EDID Minder is in Lock mode (see page 10), the last recorded EDID is stored to
the input and used after a power cycle or after the displays have been changed.
Disabling the EDID Minder
Some applications require that the distribution amplifier does not automatically read the
EDID from one or more specific outputs. In those cases, the EDID Minder feature can be
disabled so those specific outputs are ignored during the automatic scanning process:
1. Remove and keep the screws holding the cover to the base. For the DVI DA4 Plus, there
are three screws along the rear edge of the top and two screws on each side. For the
DVI DA6 Plus and DVI DA8 Plus, there are four screws along the rear edge of the top
and three screws along each side. Set aside the cover.
2. Check the part number of the printed circuit board (outlined in yellow in figure 5 on the
next page). The boards must have a part number of 20-1496-01LF and higher for the
DVI DA4 Plus or 20-1497-01LF and higher for the DVI DA6 Plus or DVI DA8 Plus.
NOTE: If the part number of the board is lower than these values, you cannot
deactivate the EDID Minder on your model. Replace the cover as described in
step 5.
DVI DA Plus Series • Operation 8