Tektronix Camcorder 2200 用户手册

3-22

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.

When mapping inputs to pushbuttons, one of the choices in the 
Configuration menu is 

, and another choice is

. Your 

selection will have an effect on how

 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 

 crosspoint is automatically 

selected on the A Background bus. If black has not been assigned 
to any pushbutton, the

 button is disabled and the 

preset black function is not permitted. If a pushbutton is assigned 
to

, black appears when that button is selected; however the 

preset black function will not use this as the 

 crosspoint. 

The

 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

 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