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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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