Rose Electronics UltraVista Plus - Manual (Page 9)

UltraVista Plus Installation and Operations Manual 5
Configuring DVI Input resolution
Because the timings and resolution of the DVI input are set by the DVI
source machine, the UltraVista Plus can only configure this indirectly by
presenting a programmable “Preferred Mode” as part of its EDID (Extended
Display Identification Data).
Most graphics cards and HDMI appliances automatically select the
“Preferred Mode” resolution and timings presented by the UltraVista Plus
EDID, but they may need to be forced to re-detect if the EDID contents are
changed by the UltraVista Plus application. This would typically be via a hot-
plug event caused by disconnecting and reconnecting the DVI input cable.
The configuration application will allow read-back of the resolution that is
currently being detected, as well as the ability to read and write the internal
EDID rom.
Monitor Outputs
The UltraVista Plus can be configured to read the corresponding EDID of
each monitor that is connected and to drive out a signal that corresponds to
the resolution, timings and mode (RGB or DVI) of the Preferred Mode. This
is the factory default configuration.
Please note that when different monitors are attached to the four outputs,
each may advertise a different Preferred Mode, therefore each output will be
driven at a different mode.
Whenever the monitor EDID is used, the UltraVista Plus will calculate the
internal scale factors to ensure that the monitor (at whatever resolution it is
being driven) will still display the correct proportion of the input image.
If an EDID cannot be read (for example if the monitor cable does not
support the DDC signals required), there is a default mode that can be
programmed into the UltraVista Plus’s memory. This is factory configured to
1920x1080p.
In some cases it may be that the user requires a very specific output timing
(for example when genlocking to the input) irrespective of the monitor
EDIDs. In this case the UltraVista Plus can be configured to always output
the mode that has been programmed as the default mode.