OSRAM EASY DMX 16x4 SO - Manual (Page 30)

30 XII 2009
EASY DMX SO Installation
Installation
Mounting the control unit
Mounting Dismounting
Wiring limitations
When planning the DMX link, the following considerations must be taken into ac-
count in addition to the information provided in corresponding DMX device instruction
sheets:
•
For outdoor installations, only use data cables designed for exterior use.
•
Typical DMX cable properties:
• low capacitance
• impedance: 85 to 150 ohms
• electrically shielded
• at least 1 twisted pair of conductors
• minimum wire size: 0.25 mm² (AWG 24) for runs up to 300 meters
• CAT 5 network cables designed for direct burial can be used, but it is recom-
mended to use conduits
•
DMX devices must be “daisy-chained” (DMX cable must be connected in one single
chain of DMX devices).
•
Max. 32 DMX devices per chain. See the separate instruction sheets of the DMX
devices for exceptions.
•
An optically isolated amplifier or splitter must be used to:
• amplify the DMX signal in environments with a high degree of electromagnetic
interfaces
• extend a link beyond 300 meters
• extend a link to include another 32 DMX devices maximum
• branch the link into further single chains, each containing max. 32 DMX devices