Tektronix Camcorder 2200 User Manual

2-17

 – When mapping inputs to 

pushbuttons, one of the choices in the CONFG 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.

You can perform a transition using any of three different controls: 
the 

, the

 button, or the

 button.

The 

 is used to perform manual transitions. Moving 

the 

 from one limit to the other always performs a 

complete transition.

Using the 

, it is possible to start a transition, stop it at 

any point, reverse it, and even return to the original limit, 
without completing the transition. The arrows at the top and 
bottom of the 

 travel lights to indicate the direction 

that the 

 has to move to complete the transition.