Grass Valley 1200 Operation Manual - Manual (Page 52)

3-6
Section 3 — Controls & Menus
PST (Preset) Bus
PST bus crosspoints select the background video that will be
placed on air by the next background transition.
PGM (Program) Bus
PGM bus crosspoints select the background video that is on air at
the switcher’s Program output.
■ You can select a PGM crosspoint directly; this causes an
immediate cut to the new video.
■ Or you can select a source on the PST bus and then do a
background transition to transfer the Preset selection to
Program.
At the end of a background transition the PGM and PST selections
“flip-flop”—the PST source transfers to PGM, and the PGM
source transfers to PST.
Figure 3-3. Crosspoint Buses
Aux
Key
PGM
PST
Uncal
Uncal
Uncal
Uncal
Uncal
Uncal
Key 1
Key 2
DSK
Bkgd Routr
4 Routr
3 Routr
2 Routr
1 DPM
2 DPM
1 VTR
3 VTR
2 VTR
1 Cam
3 Cam
2 Cam
1 Black
Bkgd Routr
4 Routr
3 Routr
1 DPM
2 DPM
1 VTR
3 VTR
2 VTR
1 Cam
3 Cam
2 Cam
1 Black
Bkgd Routr
4 Routr
3 Routr
2 Routr
1 VTR
3 VTR
2 VTR
1 Cam
3 Cam
2 Cam
1 Black
Bkgd Routr
4 Routr
3 Routr
2 Routr
1 VTR
3 VTR
2 VTR
1 Cam
3 Cam
2 Cam
1 Black
RTD1 TK 1 GF 2 GF 1
DPM
2 DPM
1
DPM
2 DPM
1
Routr
2