Chauvet DMX-690 Manuel d'utilisateur télécharger pdf (Page 10)

Fixture Linking

You will need a serial data link to run light shows of one or more fixtures using a DMX-512 controller

or to run synchronized shows on two or more fixtures set to a master/slave operating mode. The

combined number of channels required by all the fixtures on a serial data link determines the number

of fixtures the data link can support.

Important: Fixtures on a serial data link must be daisy chained

in one single line. To comply with

the EIA-485 standard no more than 32 devices should be connected on one data

link. Connecting more than 32 fixtures on one serial data link without the use of a

DMX optically-isolated splitter may result in deterioration of the digital DMX signal.

Maximum recommended serial data link distance:

500 meters (1640 ft.)

Maximum recommended number of fixtures on a serial data link: 32 fixtures

Data Cabling

To link fixtures together you must obtain data cables. You can purchase CHAUVET-certified DMX

cables directly from a dealer/distributor or construct your own cable. If you choose to create your own

cable please use data-grade cables that can carry a high quality signal and are less prone to

electromagnetic interference.

DMX DATA CABLE

Use a Belden© 9841 or equivalent cable which meets the specifications for EIA RS-485 applications.

Standard microphone cables cannot transmit DMX data reliably over long distances. The cable will

have the following characteristics:

2-conductor twisted pair plus a shield

Maximum capacitance between conductors – 30 pF/ft.

Maximum capacitance between conductor and shield – 55 pF/ft.

Maximum resistance of 20 ohms / 1000 ft.

Nominal impedance 100 – 140 ohms

CABLE CONNECTORS

Cabling must have a male XLR connector on one end and a female XLR connector on the other end.

Grounding the common can cause a ground loop, and your fixture may perform

e sure

DMX

INPUT OUTPUT

RESISTANCE 120

OHM

1/4W BETWEEN

2 (DMX -) AND

3 (DMX +) OF

THE LAST FIXTURE

Termination reduces signal errors and

to avoid signal transmission problems

and interference, it is always

advisable to connect a DMX signal

terminator.

DMX connector configuration

CAUTION Do not allow contact between the common and the fixture’s chassis ground.

erratically. Test cables with an ohm meter to verify correct polarity and to mak

the pins are not

grounded or shorted to the shield or each other.

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Chauvet DMX-690 Manuel d'utilisateur Page 10

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