ADJ Mega Bar RGBA - DMX Connection Details; XLR Pin Configuration and Line Termination

1 Ground
1 Ground
XLR Male Socket
3 Hot
2 Cold
2 Cold
3 Hot
XLR Female Socket
ADJ Products, LLC - www.adj.com - Mega Bar RGBA User Manual Page 6
Mega Bar RGBA Set Up
XLR Pin Conguration
Pin 1 = Ground
Pin 2 = Data Compliment (negative)
Pin 3 = Data True (positive)
Notice: Be sure to follow figures two and three when making your own cables. Do not
use the ground lug on the XLR connector. Do not connect the cable’s shield conductor
to the ground lug or allow the shield conductor to come in contact with the XLR’s outer
casing. Grounding the shield could cause a short circuit and erratic behavior.
DMX512 IN
3-PIN XLR
1
2
3
1
2
3
DMX +
DMX -
COMMON
DMX512 OUT
3-PIN XLR
Special Note: Line Termination.
When longer runs of cable are used, you 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 is connected between pins 2 and 3 of a male XLR connector
(DATA + and DATA -). This unit is inserted in 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.
Termination reduces signal e rrors and avoids
signal transmission problem s and interference.
It is always advisable to connect a DMX terminal,
(Resistance 120 Ohm 1/4 W) between PIN 2
(DMX-)
and PIN 3 (DMX +) of the last fixture.
5-Pin XLR DMX Connectors.
Some manufactures use 5-pin DMX- 512 data cables for
DATA transmission in place of 3-pin. 5-pin DMX xtures may be implemented in a 3-pin
DMX line. When inserting standard 5-pin data cables in to a 3-pin line a cable adapter
must be used, these adapters are readily available at most electric stores. The chart
below details a proper cable conversion.
1
2
3
3-Pin XLR to 5-Pin XLR Conversion
Ground/Shield Pin 1
Data Compliment (- signal) Pin 2 Pin 2
Data True (+ signal) Pin 3 Pin 3
Not Used Do Not Use
Not Used Do Not Use