Movement Speed - MA SCANCOMMANDER User Manual

Scancommander Scancommander Scancommander Scancommander Scancommander
Handling within the
Scancommander
Lamp types with 10 to 16
BIT accuracy
Lamp types with smooth
movements by creating
intermediate steps
Lamp types with a speed
channel
eMail: info@malighting.de . Tel.: + 49 9 31 49 79 40 . User's Manual Scancommander

3.3.7 Movement speed

Slow movements are one of the major applications of moving lights. The
MA SCANCOMMANDER controls fades by updating the position about 40
times a second. The intern resolution of the SCANCOMMANDER is 1600
steps for Pan and 1600 steps for Tilt. Using one or two channels per direction,
the Pan/Tilt informations can be sent with 8 to 16 bit accuracy. Depending on
the lamp type, the single steps of the SCANCOMMANDER will be conducted
with individual degree of accuracy.
As the DMX 512 signal features a 8 bit resolution, it offers control with 256
steps. A much improved movement control is possible, if the lamp offers a
second channel for fine adjustment, reaching a 10, 12 or 16 bit resolution.
Unfortunately today only few of the available lamps feature this second
channel for high resolution control via DMX 512.
Some of the lamps feature an intelligent logic, which enables the lamp to
make smooth movements by creating their own intermediate steps. Therefore
these lamps show a little delay on slow movement (Hysteresis). Especially
when doing the movement setup, this may cause some loose of accuracy.
Other lamps require that the speed data are sent on a separate DMX 512
channel. As this speed information has to be set by the user any time there
are changes between fast movement and slow fades or follow spot operations,
it is not very handy.
Setting this speed to maximum leaves no chance to do slow movements, as
the lamps will jump from position to position.
Appendix 1 lists the scans, which will successfully interface with the
MA SCANCOMMANDER. Unused features such as focus or zoom can be
used as a makeshift for lamps which need additional speed information.
Controlling the movement speed of these scans can be done by programming
some selective memories on S1 to S10, which only set a value on to the speed
channels.
(>>4.3 Selective memories)
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