DMX Primer 11
Cable Connectors
Cabling must have a male XLR c onnector on one end and a female XLR
connector on the other end.
Do not allow contact between the common and the fixture’s c hassis 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 m ake sure the pins are not
grounded or shorted to the s hield or each other.
Setting the Starting Address
This DMX mode enab les the use of a uni versal DMX control ler device. Each fi xture requires a
start address from 1 ~512. A fixture requiring one or mor e channels for control begins to read th e
data on the chann el indicated by the s tart address. For ex ample, a fixture th at uses six DMX
channels and was ad dressed to start on D MX channel 100, would read data fr om channels: 100,
101, 102, 103, 104, and 105. Ch oose start addresses so that th e channels used do not overlap,
and note the start address selected f or future reference.
If this is your first time addressing a fixture using the D MX control protoc ol, we suggest jumpi ng
to the “Appendix” s ection and reading the heading “DMX Pr imer”. It contains very useful
information that wi ll help you underst and its use.
COMMON
DMX +
DMX -
INPUT
OUTPUT
1
3
2
1
3
2
1
3
2
120 ohm ¼ W resistor
between pin 2 (DMX -) and
pin 3 (DMX +) on the output
of the last fixture
To avoid signal transmission problems
and interference, it is always advisable to
connect a DMX signal terminator.
DMX connector configuratio n
Terminator