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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
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.
3.
Locate the DIP switches. There is a single bank of four switches for the DVI DA4 Plus (outlined in red in figure 5). Each switch
regulates the correspondingly numbered output (1-4).
Rear Panel
Part Number
Figure 5.
Printed Circuit Board for the DVI DA4 Plus
There are two banks of four switches for the DVI DA6 Plus (see figure 6) and the DVI DA8 Plus. In the bank to the left, each
switch regulates the correspondingly numbered output (1-4). In the bank to the right, switches 1 and 2 correspond to outputs
5 and 6 for the DVI DA6 Plus; switches 1-4 correspond to outputs 5-8 for the DVI DA8 Plus.
EDID Disable DIP Switches
Figure 6.
EDID Disable DIP Switches for the DVI DA6 Plus
EDID Lock
on page 6), the last recorded EDID is stored to the input and used
EDID Lock and
EDID Minder
Pre-emphasis
Inactivation
DIP Switches
DIP Switches
Bank 1:
Outputs 1-4
Bank 2:
Outputs 5-6 (DVI DA6 Plus)
Outputs 5-8 (DVI DA8 Plus)
DVI DA Plus Series • User Guide
5
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