Swisson XND-8 - Appendix; Art-Net Port Address Representation

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Appendix
Representations of Art-Net Port Addresses
According to the Art-Net 3 specification, the address of an Art-Net port consists of three parts: The Art-Net net, sub-
net and universe number. The Art-Net universe and sub-net number both have a value between 0 and 15 (4 bits).
Many controllers combine these values to the sub-uni number, resulting in a value between 0 and 255 (8 bits), with
the sub-net part occupying the more significant digits. Thus, the sub-uni can be calculated with the formula 16 x sub-
net + universe = sub-uni.
The Art-Net net number was added in Art-Net 3 and has a value between 0 and 127 (7 bits). So, when working with
controllers using Art-Net I or Art-Net II, the Art-Net net must be set to 0.
The Art-Net net, sub-net and universe can be combined to a 15-bit port address with values from 0 to 32767, as
shown below.
Bit Digit
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Subdivided Representation
Net (0 - 127)
Sub-Net (0 - 15)
Universe (0 - 15)
Alternative Representation
Net (0-127)
Sub-Uni (0 – 255)
15-bit Port Address Rep.
(0 – 32767)
For the instances where the Art-Net net number is 0, the 15-bit port address is equivalent to the sub-uni. The table
below gives an overview of the entire Art-Net 3 address space and how it is converted to a 15-bit port address.
Art-Net Address
15-bit Port Address
Net (0 - 127)
Sub-Net (0 - 15)
Universe (0 - 15)
0
0
0
0
Art-Net II addresses
0
0
1
1
…
…
0
0
15
15
0
1
0
16
0
1
1
17
…
…
…
…
0
1
15
31
0
2
0
32
0
2
1
33
…
…
0
15
15
255
1
0
0
256
1
0
1
257
….
….
127
15
14
32766
127
15
15
32767
z
y
x
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