Tektronix Grass Valley 3000 - Manual (Page 76)

2-40
Section 2 — Startup & Configuration
Control Connections
Three forms of control connection to the DPMs are supported.
These are:
■ CPL (Control Point Language)
■ PBusII (Peripheral Bus II)
■ GPIs
Control Point Language — CPL is the communication protocol used
to couple the switcher with Kaleidoscope or Krystal. One of its
uses is to convey the physical-to-logical channel mapping
information described previously. It is also used for run control of
effects, aux bus selection (including front/back switching) and
tally.
When DPM TYPE is set to KSCOPE in the DPM Setup Menu, CPL
is automatically invoked. PORT ASSIGN must be set to the port to
which the serial cable is connected ( PORT A1 ).
Also, when KSCOPE is selected as the DPM TYPE , aux bus control
is automatically assigned to Kaleidoscope. With Kaleidoscope
controlling the aux buses, when a source button is selected on the
Kaleidoscope panel, that source button is also selected on the
switcher for that aux bus, and vice versa. So an effect running on
Kaleidoscope can cause the switcher to select different
crosspoints. This is the mechanism used to achieve front/back
switching.
All control connections have an associated control delay. The
CONTROL DELAY in the DPM Setup Menu should be set to 6 fields
when the DPM TYPE is set to KSCOPE .
When any other type of DPM is selected as the DPM TYPE , aux bus
control is performed by the Model 3000 Switcher.
Peripheral Bus II (Port A3 Only) — PBusII is used for run control of
effects using triggers. With current software, PBusII triggers are
learned into the
MISC E-MEM level. For example, when using
PBusII as the control connection for a DPM-700, the following
should be set in the DPM Setup Menu: