Blizzard-lighting Vari White ProPar (Rev A) Manual de usuario descargar pdf (Pagina 11)

Page 11

5. APPENDIX

A Quick Lesson On DMX

DMX covers (and is an abbreviation for) Digital MultipleXed signals. It is the most common

communicationsstandardusedbylightingandrelatedstageequipment.

DMX provides up to 512 control “channels” per data link. Each of these channels was

originally intended to control lamp dimmer levels. You can think of it as 512 faders on a

lighting console, connected to 512 light bulbs. Each slider’s position is sent over the data

link as an 8-bit number having a value between 0 and 255. The value 0 corresponds to the

light bulb being completely off while 255 corresponds to the light bulb being fully on.

DMX data is transmitted at 250,000 bits per second using the RS-485 transmission

standard over two wires. As with microphone cables, a grounded cable shield is used to

prevent interference with other signals.

TherearevepinsonaDMXconnector:awireforground(cableshield),twowiresfor

“Primary” communication which goes from a DMX source to a DMX receiver, and two

wires for a “Secondary” communication which goes from a DMX receiver back to a DMX

source.Generally,the“Secondary”channelisnotusedsodataowsonlyfromsources

to receivers. Hence, most of us are most familiar with DMX-512 as being employer over

typical3-pin“miccables,”althoughthisdoesnotconformtothedenedstandard.

DMXisconnectedusingadaisy-chaincongurationwherethesourceconnectstotheinput

oftherstdevice,theoutputoftherstdeviceconnectstotheinputofthenextdevice,

and so on. The standard allows for up to 32 devices on a single DMX link.

Each receiving device typically has a means for setting the “starting channel number” that

itwillrespondto.Forexample,iftwo6-channelxturesareused,therstxturemight

be set to start at channel 1 so it would respond to DMX channels 1 through 6, and the next

xturewouldbesettostartatchannel7soitwouldrespondtochannels7through12.

Troubleshooting

Symptom Solution

Fixture Auto-

Shut Off

Checkthefaninthexture.Ifitisstoppedormovingslowerthan

normal, the unit may have shut itself off due to high heat. This is to

protectthexturefromoverheating.Clearthefanofobstructions,

or return the unit for service.

Beam is Dim Check optical system and clean excess dust/grime. Also ensure that

the 220V/110V switch is in the correct position, if applicable.

No Light Output Checktoensurextureisoperatingundercorrectmode,IEsound

active/auto/DMX/Etc., if applicable. Contact service for more infor-

mation.

Chase Speed Too

Fast/Slow

Check to ensure proper setup of speed adjustment.

No Power Check fuse, AC cord and circuit for malfunction.

No Response to

Audio

Verifythatthextureisin“SoundActive”mode.

Adjust Audio Sensitivity, If Applicable.

Fixture Not

Responding /

Responding Er-

ratically

Make sure all connectors are seated properly and securely.

Use Only DMX Cables.

Install a Terminator.

Check all cables for defects.

Resetxture(s).

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