DMX: Difference between revisions
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Revision as of 16:51, 21 August 2010
DMX is a digital lighting control protocol, in which instead of 1 core of cable for each channel used (like on the Lighting Desk), 512 channels of control are transmitted down 3 wires: Data+, Data-, Gnd, with ground usually being the sheild or braid, Data+ & Data- are a twisted pair.
Current supported devices
- Chamsys MagicDMX dongle
- Eurolite DPX405 dimmer
- DMX outboard & Analogue to DMX system
Infrastructure
DMX requires a cable impedance of 120ohms. So you must not use microphone cable! All DMX equipment operates at 120ohms. Equipment is "daisy chained" together, and each device has an input and an output (they must be the correct way round).
YSTV runs 2 universes down a single Cat5e cable, as this is a very close impedance, and it is actually quite common to use Cat5e to run DMX
Connections
These are on 3 or 5 pin XLR. Currently, all YSTV DMX equipment uses 3 pin XLR
DO NOT plug dmx into any sound gear or use audio cables as a substitute, something will get fried.
Useful Notes
Don't run DMX near audio cables of any kind, even if everything is balanced. You will hear the DMX data - The sync pulses manifest as an intermittant tone & noise.
