User manual

Setup
Legend™ 1200E Spot User Manual 9 8/13/2009 10:57 AM
120 ohm ¼ W
resistor between
pin 2 (DMX -) and
pin 3 (DMX +) on
the output of the
last fixture.
Data Cabling
You must use DMX compliant data cables to link two or more DMX compatible
fixtures together. You may purchase CHAUVET certified DMX cables directly from
a dealer/distributor or construct your own cable.
USITT recommends limiting the total length of the DMX cable (from the first
fixture/controller to the last fixture) to 300 ~ 455 m (985 ~ 1,500 ft).
If you choose to create your own cable, make sure to use data-grade cables that
can carry a high frequency signal and are less prone to electromagnetic
interference. Use a Belden© 9841 or equivalent cable, which meets the
specifications for EIA RS-485 applications.
Do not use standard microphone cables for DMX applications because they
cannot transmit DMX data reliably over long distances.
DMX Data Cable
The data cable must have the following characteristics:
Type: shielded, 2-conductor twisted pair
Maximum capacitance between conductors: 30 pF/ft
Maximum capacitance between conductor and shield: 55 pF/ft
Maximum resistance: 20 ohms/1000 ft
Nominal impedance: 100 ~ 140 ohms
DMX Cable
Connectors
Each DMX cable must have a male, 3 or 5-pin XLR
connector on one end and a female, 3 or 5-pin XLR
connector on the other end.
To avoid signal transmission problems and interference, it is always advisable to
connect a DMX signal terminator, as seen below.
Test all DMX cables with an ohmmeter to verify their correct polarity and to
make sure that there are no short-circuits between any of the pins, or between
any pin and ground. If the Common wire touched the chassis ground, a
ground loop could form, which may cause the fixture to perform erratically.
120 ohm, ¼ W
resistor between
pin 2 (DMX -) and
pin 3 (DMX +) on
the output of the
last fixture.
1
3
2
To DMX Input
(Female)
DMX Connector Configuration
Common
DMX +
DMX -
1
3
2
1
3
2
To DMX Output
(Male)