12
Managing EDID video display information
Whenever a AV4PRO-DVI unit is powered on (or when the option
is
selected from the
configuration
menu), it will interrogate the connected
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:
1
2
3
4
USB2.0
SWITCHED
USB 1
USB 2
V1
V2
V3
V4
5V
4A
USER
CONSOLE
OPTIONS
Computer 1
Computer 2
Computer 3
Computer 4
Display
1
Display
2
Display
3
Display
4
EDID
EDID
EDID
EDID
Refreshing EDID information during use
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
Configuration
menu.
2 Press
to enter the
Functions
menu
3 Press and then
.
4 Press and then
to exit the menu.
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
display, use the F 2 function discussed above.
To use the stored EDID information at the power up
1 Enter the
Configuration
menu.
2 Press
to enter the
Functions
menu
3 Press and then
.
4 Press and then
to exit the menu.
Hybrid DDC (support for DDC/CI)
The Hybrid DDC feature supports the industry standard DDC/CI
(Command Interface) protocol and allows full two-way
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
Configuration
menu.
2 Press
to enter the
User Preferences
menu and then press
either:
to
Enable Hybrid DDC
to
Disable Hybrid DDC
3 Press
to accept the setting and return to the main menu
section.
4 Press and then
to exit the menu and save changes.
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.
