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Chapter 2
Protocols
The QuadCore is fitted with several communication ports and supports various
protocols. This chapter describes these protocols and to which extent they are
implemented in the QuadCore
2.1
DMX-512
DMX-512 is the standard communication protocol for stage lighting. Its official
name is E1.11-2008 USITT DMX512-A. Nowadays the reach of the DMX proto-
col has extended beyond entertainment lighting and is also used for architectural
lighting.
Originally one DMX network contained 512 channels which is called a 'universe'.
With the growing size and complexity of lighting systems it is now very common
for a system to compose of multiple universes, each conveying 512 channels.
It is advised to use a shielded twisted pair cable for DMX cabling. The cable
should be terminated with an 120 Ohm resistor.
DMX-512 is a very successful protocol with, however, a few limitations. The
maximum number of attached devices is limited to 32 and they all have to be
connected in bus-topology having one cable running via each device. Further-
more, a DMX-512 cable should not be longer than 300 meters.
13
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