<s>
Art-Net	B-Protocol
is	O
a	O
royalty-free	O
communications	O
protocol	O
for	O
transmitting	O
the	O
DMX512-A	O
lighting	O
control	O
protocol	O
and	O
Remote	O
Device	O
management	O
(	O
RDM	O
)	O
protocol	O
over	O
the	O
User	B-Protocol
Datagram	I-Protocol
Protocol	I-Protocol
(	O
UDP	O
)	O
of	O
the	O
Internet	B-Protocol
protocol	I-Protocol
suite	I-Protocol
.	O
</s>
<s>
Art-Net	B-Protocol
is	O
a	O
simple	O
implementation	O
of	O
DMX512-A	O
protocol	O
over	O
UDP	O
in	O
which	O
lighting	O
control	O
information	O
is	O
conveyed	O
in	O
IP	O
packets	O
,	O
typically	O
on	O
a	O
private	O
local	B-General_Concept
area	I-General_Concept
network	I-General_Concept
such	O
as	O
Ethernet	O
.	O
</s>
<s>
Supported	O
functions	O
include	O
transmitting	O
and	O
receiving	O
lighting	O
data	O
(	O
e.g.	O
,	O
fader	O
levels	O
for	O
individual	O
lights	O
,	O
positions	O
of	O
movable	O
lights	O
)	O
;	O
management	O
functions	O
such	O
as	O
detecting	O
nodes	O
,	O
updating	O
node	O
control	O
parameters	O
,	O
and	O
transmitting	O
timecodes	O
;	O
and	O
functions	O
that	O
allow	O
nodes	O
to	O
"	O
subscribe	O
"	O
to	O
"	O
publisher	O
"	O
nodes	O
so	O
that	O
,	O
for	O
example	O
,	O
nodes	O
A	O
and	O
B	O
can	O
subscribe	O
to	O
node	O
C	O
(	O
C	O
will	O
unicast	B-Protocol
information	O
to	O
A	O
and	O
B	O
)	O
.	O
</s>
<s>
Art-Net	B-Protocol
has	O
gone	O
through	O
four	O
versions	O
which	O
are	O
claimed	O
to	O
be	O
interoperable	O
.	O
</s>
<s>
Art-Net	B-Protocol
I	O
used	O
broadcasts	O
extensively	O
,	O
giving	O
a	O
universe	O
limit	O
of	O
approximately	O
40	O
.	O
</s>
<s>
Art-Net	B-Protocol
II	O
mostly	O
uses	O
unicast	B-Protocol
packets	O
,	O
and	O
addresses	O
256	O
universes	O
.	O
</s>
<s>
Art-Net	B-Protocol
III	O
,	O
released	O
in	O
2011	O
,	O
addresses	O
issues	O
in	O
managing	O
larger	O
numbers	O
of	O
universes	O
,	O
up	O
to	O
32,768	O
.	O
</s>
<s>
Networks	O
can	O
use	O
DHCP	B-Protocol
or	O
statically	O
configured	O
IP	O
addresses	O
,	O
and	O
use	O
unicast	B-Protocol
packets	O
for	O
greater	O
network	O
efficiency	O
.	O
</s>
<s>
The	O
pink	O
portion	O
is	O
the	O
same	O
on	O
all	O
Art-Net	B-Protocol
packets	O
;	O
the	O
green	O
portion	O
is	O
variable	O
.	O
</s>
<s>
Sequence	O
is	O
a	O
sequential	O
number	O
between	O
1	O
and	O
255	O
allowing	O
the	O
recipient	O
to	O
reorder	O
packets	O
to	O
address	O
out-of-order	B-Protocol
delivery	I-Protocol
(	O
this	O
value	O
is	O
set	O
to	O
0	O
to	O
disable	O
this	O
feature	O
)	O
;	O
physical	O
is	O
an	O
information	O
packet	O
showing	O
the	O
original	O
physical	O
universe	O
of	O
this	O
data	O
,	O
if	O
required	O
.	O
</s>
<s>
In	O
practice	O
the	O
packet	O
is	O
typically	O
unicast	B-Protocol
to	O
the	O
correct	O
node	O
.	O
</s>
