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AZUREM2.DOC 18.03.1999 12:40
fixture waits for the correct channels to come up, then reads in the levels
for those channels.
Dimmers can also understand DMX; some dimmers can read it directly,
others use a demultiplexer or “demux” to convert the DMX into the normal
0 to 10 volt analogue signals they are used to.
10.5 Moving light control desks
Sliders are ideal for controlling dimmers. More complicated dimmer control
desks have memories to record the level of all the dimmers, so you can
recall a setting without having to set all the sliders again during a show.
However, once you start controlling lights that move and change colour,
sliders become less ideal, because it is the movement rather than the end
level which is important. Dedicated moving light desks such as the Azure
include many helpful functions which makes the programming of
intelligent lighting much easier, such as palettes of pre-programmed
colours and positions, and a shape generator to create movements.
10.6 A few cautions about using DMX
DMX is a robust system which normally works very well, but sometimes it
can be problematic. Here are a few tips for making DMX work well.
?? DMX cabling should be twisted-pair data cable. Microphone cable is not
recommended because it doesn’t transmit the signal as well. You will
probably get away with it, but equally you might have problems.
?? Always connect a terminator plug on the last fixture. This has a 120
ohm resistor across the DMX line and prevents data interference on the
line. It might work without but…
?? Don’t split the DMX cable. Loop it from one unit to the next. If you
have to split it, use a proper active splitter unit.
?? Don’t try to run more than 16 fixtures from one DMX line. Either use
several DMX lines (the Azure has four) or use a DMX repeater unit.
Again, you will probably get away with using more if you have to, but
the DMX signal will be weaker than it should be.
?? Don’t run your DMX lines near high voltage cables or neon. They may
pick up interference which will stop the system working, or worse, blow
up the receiver electronics in the fixtures (this really does happen).
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