Vicon VC2650-DSP, Installation And Operation Manual

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and
4) The screen will appear divided into 48 squares, as shown in the following
figure:
1
1
1
1
Some of the 48 squares will have a white dot in them, which means that
the BLC function is activated in these areas of the screen. If the
“PRESET” submenu is turned “ON,” then the areas with white dots,
which were designated at the time of manufacturing, will be shown and
cannot be changed.
5) If you want to change the BLC setting, exit from the ‘WINDOW AREA
SET...” menu by pressing the [Enter] switch for approximately two
seconds. Turn the “PRESET” menu “OFF” and then select the
‘WINDOW AREA SET...” menu.