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14
Disabling DDC
As previously mentioned, DDC offers “Plug and Play”
ease of setup to the user. To take advantage of DDC
requires suitable hardware and software inside your
computer and it is possible that you will be attaching your
monitor to a computer that does not support DDC. In most
cases, this does not cause a problem other than the fact
that the screen mode will need to be optimised manually.
However, if you are attaching to the DDC monitors PS/2
computer or one of a handful of video adapter cards, DDC
may not be compatible with the computer and results in
either a blank screen or a green screen being displayed.
In such a situation, this sequence should be followed:-
Press and hold the left hand side of Key 7 (see page 10)
for 15 seconds. This disables DDC. DDC can be enabled
again by pressing and holding the right hand side of Key 7
15 seconds.
In both cases it is recommended that (if possible) this is
done while something is displayed on the screen since
after the 15 second delay the screen will flash, confirming
that the change has been implemented.
In addition it is possible to find out whether or not DDC is
enabled by looking at the LED. If DDC is disabled, the
LED will go amber for two seconds at power up, before
turning green. If DDC is enabled, the LED will be
continually Green.
Each time the monitor is powered on, the LED will
indicate the DDC status.
DDC Reset
It is possible that even if you are attaching to a DDC-
capable computer your computer will not recognise your
monitor as being DDC enabled. There are three likely
reasons for this.
1 Monitor set to ‘DDC disabled’. Refer to the above
section for details on how to enable DDC again.
2 DDC not enabled within your computer. Consult your
computers documentation.
3 DDC may have ceased to operate for some reason.
This may happen if attaching to a computer that has not
fully implemented VESA recommendations on DDC or if,
during installation, the monitor was first connected to the
computer while the monitor’s power cord was already
plugged in.
use.doc Page 14 Sunday, July 16, 1995 3:45 PM