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Page 6 LED 54AW User Manual rev. A
3.
SETUP
DMX Cabling
The LED 54AW has standard 3-pin XLR connectors for DMX con-
trol and daisy-chaining. Up to 32 devices can be daisy-chained
together on a single run. Standard microphone cables will
probably work OK, but DMX is a serial data transmission with
impedance specifications that are different than analog audio.
Cables specifically designed to transmit DMX signals will always
work best. As an example, Belden© 9841 meets the specifica-
tions for DMX-512 applications. The longer the cable distance,
the more important proper cable selection is.
DMX Termination
Sometimes, errors will crop up in your DMX line – especially if it
is a long run. When this is the case, or if you just want to make
sure your DMX runs have the best chance at accurate transmis-
sion, you can use a terminator. A terminator is a 120 ohm ¼
watt resistor which is connected between pins 2 and 3 of a male
XLR connector (DATA + and DATA -). This connector is inserted
in the female XLR connector of the last fixture in your daisy
chain to terminate the line. Using a cable terminator will de-
crease the possibility of erratic behavior. Terminators are avail-
able on the internet and from lighting retailers. If you’re handy
with a soldering iron, they are simple to build yourself!
1
120 Ohm resistor
¼ watt
DMX Terminator
3-pin XLR Male connector
1
2
3
1
2
3
Shield
Data +
Data -
2
3