Grass Valley Maestro Master Control Reference Manual v.2.4.0 - Manual (Page 58)

58 MAESTRO — Automation Interface Protocol Technical Reference Manual
Section 4 — Definition of Supported Saturn Commands
PROLL (Preroll time)
Hex definition Mnemonic
91 PROLL
Command format:
PROLL <seconds>
Query format:
READ PROLL
Reply format:
IFRE PROLL <seconds>
Use applicable with UPDATE:
Yes
Argument definitions:
<
seconds> = 0-9, 0-9 secs:tenths (two bytes)
Maestro applicability:
As stated.