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Section 3 — Menu Descriptions
Each input, including internally generated signals such as black
and background, can be mapped to any vertical column of source
select (“crosspoint”) buttons. You may determine the input
assignments and the characteristics of the input signals through
the use of the Configuration submenus, as described in the
following procedures.
NOTE:
The external video and key assignments are set up following
installation to correspond to the video and key inputs connected to the
frame. These assignments should never be changed by the operator.
Configuring the Black Crosspoint
When mapping inputs to pushbuttons, one of the choices in the
Configuration menu is BLACK, and another choice is NONE. Your
selection will have an effect on how PRESET BLACK operates, and
what will happen in the event the controller CPU fails.
When the first transition during a preset black operation is
completed, the left most BLACK crosspoint is automatically
selected on the A Background bus. If black has not been assigned
to any pushbutton, the PRESET BLACK button is disabled and the
preset black function is not permitted. If a pushbutton is assigned
to NONE, black appears when that button is selected; however the
preset black function will not use this as the BLACK crosspoint.
Processor Failure
The BLACK crosspoint is also important in the situation where the
Controller main CPU fails while one of the M/Es is performing a
re-entry. When it fails, the M/Es are required to abandon their re-
entry crosspoints and select BLACK on the same bus. In the case
where black was never assigned to a pushbutton, the M/E selects
the left most crosspoint on the bus.
BLACK