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Managing EDID video display information
Whenever a AV4PRO-DVI unit is powered on (or when the option
selected from the
configuration
monitor(s) to determine whether EDID (Extended Display Identification Data)
information is available. If EDID information is available, it will be copied and
used; otherwise a default set of data, stored within the AV4PRO-DVI, will be
substituted. You can also optionally choose to prevent the unit from seeking
new EDID information and instead rely only on stored data.
EDID Emulation
The AV4PRO-DVI units use our EDID Emulation feature to ensure that the
collected EDID information (up to two pages) is correctly supplied to every
connected computer, whether it is currently selected or not:
Display
4
Display
3
Display
2
USER
Display
CONSOLE
1
5V
4A
Hybrid DDC
In addition to EDID Emulation, all AV4PRO-DVI units provide a feature known
as Hybrid DDC. This feature supports the industry standard DDC/CI (Command
Interface) protocol and allows full two-way communication between the
display and the currently selected computer. This allows the computer to make
adjustments to the display (e.g. brightness, colour balance, etc.), an important
requirement for certain professional applications. Hybrid DDC can also transfer
the authorisation signals that are required by HDCP (High-bandwidth Digital
Content Protection) compliant video sources and displays that ensure high
definition copy protection.
menu), it will interrogate the connected
4
3
2
OPTIONS
EDID
EDID
EDID
Computer 4
Computer 3
Computer 2
Refreshing EDID information during use
is
You can refresh the EDID information from the connected monitor(s)
without the need to power cycle the AV4PRO-DVI.
To refresh EDID information during use
1 Enter the
2 Press
3 Press
4 Press
Using stored EDID information only
You can choose to prevent the unit from interrogating the video
display(s) during startup. When you invoke this option, the unit will
only use the EDID information that it has already stored and pass this
on to the connected computers. To revert to interrogating the video
V4
display, use the F 2 function discussed above.
V3
To use the stored EDID information at the power up
1 Enter the
V2
2 Press
3 Press
V1
1
4 Press
USB 1
USB 2
Hybrid DDC (support for DDC/CI)
USB2.0
SWITCHED
The Hybrid DDC feature supports the industry standard DDC/CI
EDID
(Command Interface) protocol and allows full two-way
Computer 1
communication between the display and the currently selected
computer. You can enable or disable the Hybrid DDC feature as
required.
To enable/disable Hybrid DDC feature
1 Enter the
2 Press
either:
to Enable Hybrid DDC
to Disable Hybrid DDC
3 Press
section.
4 Press
Configuration
menu.
to enter the Functions menu
and then
.
and then
to exit the menu.
Configuration
menu.
to enter the Functions menu
and then
.
and then
to exit the menu.
Configuration
menu.
to enter the User Preferences menu and then press
to accept the setting and return to the main menu
and then
to exit the menu and save changes.
12
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