ADJ NET 8 Mode D'emploi page 9

D M X S E T U P
DMX-512:
Digital Multiplex, or DMX, serves as a universal protocol utilized by most lighting and controller manufacturers
for communication between intelligent fixtures and controllers. A DMX controller sends DMX data instructions
from the controller to the fixture. DMX data is transmitted as serial data, traveling from fixture to fixture
through the DATA 'IN' and DATA 'OUT' XLR terminals found on all DMX fixtures. Most controllers only have
a DATA 'OUT' terminal.
DMX LINKING:
As a language, DMX enables all makes and models from different manufacturers to be connected and
operated from a single controller, provided that all fixtures and the controller are DMX compliant. To ensure
proper DMX data transmission when using multiple DMX fixtures, use the shortest cable path possible. The
order in which fixtures are connected in a DMX line does not affect the DMX addressing. For example, a
fixture assigned a DMX address of 1 can be placed anywhere in a DMX line—at the beginning, at the end,
or anywhere in the middle. Therefore, the first fixture controlled by the controller could be the last fixture in
the chain. When a fixture is assigned a DMX address of 1, the DMX controller knows to send data assigned
to address 1 to that unit, regardless of its position in the DMX chain.
DATA CABLE (DMX CABLE) REQUIREMENTS:
The Net 8 can be controlled via the DMX-512 protocol. The DMX address
is electronically set using the controls on the front panel of the unit.
Both the unit and the DMX controller require an approved DMX-512 110
Ohm Data cable for data input and output. Accu-Cable DMX cables are
recommended. If you are making your own cables, ensure that you use
standard 110-120 Ohm shielded cable (which can be purchased at most
professional sound and lighting stores). Cables should be made with a
male and female XLR connector on either end of the cable. Additionally,
keep in mind that DMX cable must be daisy-chained and cannot be split.
LINE TERMINATION:
When using longer runs of cable, one may need to use a terminator on the last unit to avoid erratic behavior. A
terminator is a 110-120 ohm 1/4-watt resistor, which connects between pins 2 and 3 of a male XLR connector
(DATA + and DATA -). Insert this unit into the female XLR connector of the last unit in your daisy chain to
terminate the line. Using a cable terminator (ADJ part number Z-DMX/T) will decrease the possibilities of
erratic behavior.
A DMX512 terminator reduces signal errors,
avoiding most signal reflection interference.
Connect PIN 2 (DMX-) and PIN 3 (DMX+) of
the last fixture in series with a 120 Ohm, 1/4 W
Resistor to terminate the DMX512.
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