Ddc Switches - Extron electronics Dual Link DVI Transmitter and Receiver DVI DL 201 Rx User Manual

DDC switches

When the DVI-D source device boots up, it uses the Display
Data Channel (DDC), a two-way communication protocol, to
obtain Extended Display Identification Data (EDID) from the
display device. This allows the source to output a resolution
that matches the capabilities of the display.
A bank of three switches allows the user to determine how the
source device will obtain the EDID. The EDID can be obtained
directly from the display device, or from the internal memory
within. The three switches are:
EDID Minder — This switch must be on for the EDID Minder
function to be enabled. The factory default for this switch is the
off position.
Default EDID — When the Default EDID switch
is on (factory default; see figure at right), an EDID
showing a typical Dual Link DVI display resolution
of 2560x1600 @ 60 Hz is passed to the source device.
ON
ON
The EDID Minder switch must also be on for the
Default EDID switch to function.
1 2 3
OFF
Remote DDC — When this switch is off, the DDC
is routed to the local monitor. When the switch is on, the DDC
is routed to the remote display device.
See page 3-2 for more information about configuring these
switches to provide the source device with the correct EDID.
DVI DL 201 Tx/Rx • Installation 2-17