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3.SETUP
Fixture Linking
You will need a serial date 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 of channels required by all the fixtures on a serial data
link determines then 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 digital
DMX signal.
Maximum recommended serial data link distance: 500 meters (1640ft)
Maximum recommended number of fixtures on a serial data link : 32 fixtures
DMX DATA CABLE
Use a Belden 9841 or equivalent cable which meets the specification for EIA
RS-485applications.Standard microphone cables cannot transmit DMX data reliably over long
distances. The cable will have the following characteristics:
2-conduuctor twisted pair plus a shield .
Maximum capacitance between conductors - 30 pF/ft.
Maximum capacitance between conductor and shield - 55pF/ft.
Maximum resistance of 20 ohms /1000 ft.
Nominal impedance 100-140 ohms.
