Alcorn Mcbride V+ series, User Manual

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Application Notes 7-17
Showtime is the main timekeeping sequence for running the theatre show.
Showtime's 0 starting frame corresponds to the first frame played back from
all of the DVD Players. We define it this way to make it easier to program
the sequence of theatre events: all of the time offsets throughout the
sequence are relative to the show frame being played back. (If events need
to occur after StartShow and before the DVD Players play, these events
should be placed in another sequence started by StartShow. At its
completion that new sequence should start Showtime.)
Showtime immediately issues a play command to all of the DVD Players.
Again we do this by starting multiple parallel sequences to assure that the
commands are all processed in parallel and all the players start on the same
frame. By doing this we have guaranteed that the V16+ will send the serial
commands to all players simultaneously.
Simultaneously with a play command to all of the DVD Players, Showtime
sends a start message to the Digital Binloop system. Next, we send a start
pulse message to the projector. Then, we send a serial message to the RCC
telling it to start its motion control playback.