DMX: Difference between revisions

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DMX is a digital lighting control protocol, in which instead of 1 core for each channel used & a common gorund (like on the [[Technical:Lighting Desk|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.
DMX is a digital lighting control protocol, in which instead of 1 core for each channel used & a common gorund (like on the [[Technical:Lighting Desk|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==
==Current supported devices==
* Chamsys MagicDMX dongle
 
* Eurolite DPX405 dimmer
If you're taking out equipment with different pin numbers, remember to take some conversion cables.
* DMX outboard & Analogue to DMX system
 
=== 3-pin ===
*[[Dimmers#Eurolite DPX-405|Eurolite DPX-405]]
*[[Lanta Orion Trico 7|Trico's]]
 
=== 5-pin ===
*[[Strand 200+]]
*[[Dimmers#Strand 6pack|Strand 6pack]]


==Infrastructure==
==Infrastructure==
YSTV runs 2 lines (one each way)down a single Cat5e cable, from the control room's Master patch panel, to the LX patch panel in the studio.
YSTV runs 2 lines (one each way)down a single Cat5e cable, from the control room's Master patch panel, to the LX patch panel in the studio. Currently unused.


==Connections==
==Connections==
These are on 3 or 5 pin XLR. Currently, all YSTV DMX equipment uses 3 pin XLR
These are on 3 or 5 pin XLR.


'''DO NOT plug dmx into any sound gear or use audio cables as a substitute, something will get fried.'''
'''DO NOT plug dmx into any sound gear - something will be unhappy!'''


==Technical==
==Technical==
* DMX requires a cable impedance of 120ohms.
* DMX requires a cable impedance of 120ohms.
** So you must not use microphone cable!
** try not to use mic cable, however it will suffice for short runs (<40m)
* Equipment is "daisy chained" together, using each device's input and an output ports(they must be the correct way round).
* Equipment is "daisy chained" together, using each device's input and an output ports.
* Data+ and Data- must be a twisted pair.
* Data+ and Data- must be a twisted pair.
* Multiple types of cable will do the job:
* Multiple types of cable will do the job:
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** 10outoften
** 10outoften
** Usedlighting / stagelighting (lighting Partners Ltd)
** Usedlighting / stagelighting (lighting Partners Ltd)
Cat5e:
* Impedance of 110 ohms (approx) makes it suitable.
* Use any twister pair, and pick another as ground.


==Useful Notes==
==Useful Notes==
*Don't run DMX right next to audio cables of any kind unless completely unavoidable, even if everything is balanced. You will hear the DMX data - The sync pulses manifest as an intermittent tone & noise.
*Don't run DMX right next to audio cables of any kind unless completely unavoidable, even if everything is balanced. You may hear the DMX data - The sync pulses manifest as an intermittent clicks...
 
[[Category:Lighting]]

Latest revision as of 09:06, 23 July 2021

DMX is a digital lighting control protocol, in which instead of 1 core for each channel used & a common gorund (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

If you're taking out equipment with different pin numbers, remember to take some conversion cables.

3-pin

5-pin

Infrastructure

YSTV runs 2 lines (one each way)down a single Cat5e cable, from the control room's Master patch panel, to the LX patch panel in the studio. Currently unused.

Connections

These are on 3 or 5 pin XLR.

DO NOT plug dmx into any sound gear - something will be unhappy!

Technical

  • DMX requires a cable impedance of 120ohms.
    • try not to use mic cable, however it will suffice for short runs (<40m)
  • Equipment is "daisy chained" together, using each device's input and an output ports.
  • Data+ and Data- must be a twisted pair.
  • Multiple types of cable will do the job:


Sheilded Twisted pair:

  • This is the "defacto-standard"
  • You can get it almost anywhere, below are some retailers (no links because they inevitably die! - just go googling)
    • Canford
    • 10outoften
    • Usedlighting / stagelighting (lighting Partners Ltd)

Cat5e:

  • Impedance of 110 ohms (approx) makes it suitable.
  • Use any twister pair, and pick another as ground.

Useful Notes

  • Don't run DMX right next to audio cables of any kind unless completely unavoidable, even if everything is balanced. You may hear the DMX data - The sync pulses manifest as an intermittent clicks...