Chapter 10 Automated Devices
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Creating and Editing DDLs
Before a DDL is created or edited (via the console or a text editor), it is
important to understand the following definitions of what comprises a DDL:
1. Types of Traits
There are three
types of traits
used when defining a device: Continuous,
Indexed and Union:
Continuous traits:
These are traits that move continuously from a
minimum value to a maximum value such as pan/tilt or lamp intensity.
The attributes for Continuous traits include
:
Channel offset, Size of the
Data, Invert, X axis, Y axis, Blackout, Default, Maximum and Minimum.
(See Trait Attributes definitions below.)
Indexed traits:
These are traits that do not move continuously. Instead,
discrete values are assigned to each index along with a unique label. These
are most often used to describe the indexed positions of individual colors or
gobos for example.
The attributes for Indexed traits include: Channel offset, X axis, Y axis,
Blackout, Default, Index Label and Index Value.
(See Trait Attributes definitions below.)
Union traits:
These are made of combinations of both Continuous and
Indexed traits. An example of a Union would be a Color Wheel, which uses
a continuous range of DMX 512 values for spins and then discrete (indexed)
values for fixed color positions. The End Union trait is used to flag the end
of the Union structure. For example, if you were to define a Color Wheel as
described above, you would first insert a Union trait, then insert Continuous
and Indexed traits as needed followed by the End Union trait.
2. Trait Labels
Once the type of trait has been determined, a trait label (name) can be
assigned to the trait. The label can be up to eight characters long.
3. Trait Attributes
After the label has been selected, the attributes of the trait can be edited. A
discussion of each type of Trait Attribute follows:
Channel:
This
determines which channel of the DMX 512 data stream
should be used for the trait. This is a relative number which is added on to
the base address of the device once it is assigned. For example, if a device
is assigned to DMX channel 20 and a trait is assigned to channel 1 of the
device, the trait will end up being assigned to channel 20 not 21.
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