Grass Valley Maestro Master Control Reference Manual v.2.4.0 - Manual (Page 136)

136 MAESTRO — Automation Interface Protocol Technical Reference Manual
Section 5 — Definition of Extended Maestro Commands
MAESTRO_PREROLL_DURATION
Hex definition Mnemonic
0x4B MAESTRO_PREROLL_DURATION
Command format:
MAESTRO_PREROLL_DURATION
Query format:
READMAESTRO_PREROLL_DURATION
Reply format:
IFRE MAESTRO_PREROLL_DURATION
Use applicable with UPDATE:
Yes
Argument definitions:
(unsigned two bytes) = seconds:frames
Notes
For a 30 frame video standard, the valid range for Pre Roll time is from 0 seconds and 0 frames (0:00) to 9 seconds and 29
frames (9:29). For a 25 frame video standard, the valid range for Pre Roll time is from 0 seconds and 0 frames (0:00) to 9
seconds and 24 frames (9:24). If there is a Pre Roll time entered in the GPIO Definition Table, then an entry of a Pre Roll
time outside the valid range will result in the Pre Roll Duration defaulting back to the Pre Roll time from the GPIO defini-
tion table. If there is not a Pre Roll time entered in the GPIO Definition Table, then an entry of a Pre Roll time outside the
valid range will result in an error message being reported (that is, the command will not be executed).