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A-2 DMX Protocols Technobeam
®
User Manual
MSpeed vs. Fast Changes
There are two different ways you can choose to move the color and litho
wheels: fast changes or MSpeed changes.
A
fast
change means the color or litho movement is completed in the shortest
amount of time after the wheel starts moving.
An
MSpeed
(motor/mirror speed) change occurs smoothly over the entire
MSpeed time value. For example, if you choose a numerical DMX value of 202
for an MSpeed color change from position 2 to position 4, that means the color
wheel changes gradually to position 4 over 11.41 seconds. (Most controllers
also allow you to program advanced features, like crossfade or delay time.
Make sure your MSpeed value is at least as long as the crossfade or delay time;
otherwise, the color or litho change will not complete before the next page or
scene starts.)
MSpeed time values are shown in Table A-3 on page A-13.
Ramp Open, Snap Shut
The Shutter construct includes parameters named “Ramp open, snap shut” and
“Snap open, ramp shut”. A
snap
is an instant shutter movement (opening or
closing); the snap time never varies. What you can vary is the timing of the
ramp
, which is a gradual shutter movement. A lower value always means a
longer ramp, and a higher value always means a shorter ramp.
Forward and Reverse Spins
A
forward
spin on all wheels and positions means the wheel or position spins
clockwise as you’re looking at the projected image. A
reverse
spin means the
wheel or position spins counter-clockwise.