Grass Valley 2200 - Manual (Page 77)

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Timeline Control (4E, 4F, CE, and CF) Commands
Bit-Mask Format
The two-byte bit mask allows the editor to specify any combination of effects
addresses 00 through 0A. The LSB (bit 0) represents the Þrst address, and bit 10
represents the DPM 4 address. The top 6 bits are Òdon't care.Ó
Data Field Format
All time data (Þeld count) and speed data is speciÞed to be binary data in S15.16
format. The lower two bytes specify a fractional Þeld value. The topmost bit is the
sign bit and the next 15 bits represent whole Þeld values.
Note the following examples:
+1 field ==> 00 01 00 00
Ð 1 field ==> FF FF 00 00
+1 (unity) speed ==> 00 01 00 00
Ð 1/2 speed ==> FF FF 80 00
Setting the Run Time for a speed of zero is the same as sending a STOP command.
The editor is allowed to write a negative Þeld count or to trim in a negative
direction which results in a negative Þeld count. In either case the result is to
display a negative timecode in the menu and position the video at the 1st
keyframe. The video will remain at that position until one of the following occurs:
¥ The effect runs long enough for the field count to pass zero
¥ The editor successively trims the field count in a positive direction until
zero is passed
¥ The editor writes a positive, non-zero field count to the switcher
Bit Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
PGM-PST Mix System
Mix/Effects 1 System
Mix/Effects 2 System
Mix/Effects 3 System
Downstream Keyer (DSK)
Background (BKGD)
Miscellaneous (MISC)
DPM 1
DPM 2
DPM 3
DPM 4