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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 must
have the following characteristics:
Type:
Maximum capacitance between conductors:
Maximum capacitance between conductor and shield:
Maximum resistance:
Nominal impedance:
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.
Setting up a DMX Serial Data Link
1. Connect the (male) 3-pin connector side of
the DMX cable to the output (female) 3-pin
connector of the controller.
2. Connect the end of the cable coming from
the controller which will have a (female)
3-pin connector to the input connector of
the next fixture consisting of a (male) 3-pin
connector.
3. Then, proceed to connect from the output
as stated above to the input of the following
fixture and so on.
Setting the Starting Address
This DMX mode enables the use of a universal DMX controller device. Each fixture requires a start address
from 1~512. A fixture requiring one or more channels for control begins to read the data on the channel
indicated by the start address. For example, a fixture that uses six DMX channels and was addressed to start
on DMX channel 100, would read data from channels: 100, 101, 102, 103, 104, and 105. Choose start
addresses so that the channels used do not overlap, and note the start address selected for future reference. If
you are not familiar with DMX, download the DMX Primer from www.chauvetlighting.com.
LED PAR 38-18UV User Manual
shielded, 2-conductor twisted pair
Universal DMX Controller
Continue the link
13
30 pF/ft
55 pF/ft
20 ohms/1000 ft
100 ~ 140 ohms
This drawing
provides a general
illustration of the
DMX input/output
panel of a lighting
fixture.
Rev. 2
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