Fixture Linking; Data Cabling; Dmx Data Cable; Cable Connectors - Chauvet LEG-4500 User Manual

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 D ATA C ABLE
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:
C ABLE CONNECTORS
Cabling must have a male XLR connector on one end and a female XLR connector on the other
end.
3-pin DMX connector configuration
INPUT
5-pin DMX connector configuration
Termination reduces signal errors.
To avoid signal transmission
problems and interference, it is
always advisable to connect a DMX
signal terminator.
CAUTION Do not allow contact between the common and the fixture's chassis ground. Grounding
the common can cause a ground loop, and your fixture may perform erratically. Test
cables with an ohm meter to verify correct polarity and to make sure the pins are not
grounded or shorted to the shield or each other.
Legend™ 4500 User Manual
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
COMMON
1
DMX +
3
2
-
DMX
1
3
2
1
OUTPUT
3
2
11
Resistance 120
ohm 1/4w
between pin 2
(DMX -) and pin
3 (DMX +) of the
last fixture.
Resistance 120
ohm 1/4w
between pin 2
(DMX -) and pin
3 (DMX +) of the
last fixture.
12/10/2008 4:28 PM