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ST-800X User Manual 8 2007-03-07/10:58
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.
The Thruster™ fixtures use 2 channels of DMX control.
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 20Ω / 1000 ft.
• Nominal impedance 100 - 140Ω
Cable Connectors
Cabling must have a male XLR connector on one end and a female XLR connector on the other end.
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 to perform
erratically. Test cables with OHM meter to verify correct polarity and to make
sure the pins are not grounded or shorted to the shield or each other.
COMMON
DMX +
DMX -
INPUT OUTPUT
1
3
2
1
3
2
1
3
2
Resistance 120
ohm 1/4w between
pin 2 (DMX -) and
pin 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
DMX connector configuration