ADJ UB 12H User Manual page 10

D M X S E T U P
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.
DMX-512 OUT 3-PIN XLR
XLR Male Socket
1 Ground
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.
5-Pin XLR DMX Connectors. Some manufacturers use 5-pin DMX-512 data cables for DATA
transmission in place of 3-pin. 5-pin DMX fixtures may be implemented in a 3-pin DMX line by using a
cable adapter, which can readily be found at most electronics stores. The chart below details a proper
cable conversion.
Conductor
Ground/Shield
Data Compliment (- signal)
Data True (+ signal)
Not Used
Not Used
1
3
2
XLR Female Socket
2 Cold
2 Cold
3 Hot
Termination reduces signal errors and avoids signal
1
transmission problems and interference. It is always
3
advisable to connect a DMX terminal, (Resistance
2
120 Ohm 1/4 W) between PIN 2 (DMX-) and PIN 3
(DMX +) of the last fixture.
3-Pin XLR to 5-Pin XLR Conversion
3-Pin XLR Female (Out)
COMMON
DMX +
1
DMX-512 IN 3-PIN XLR
3
DMX -
2
XLR Pin Configuration
Pin 1 = Ground
1 Ground
Pin 2 = Data Compliment (negative)
3 Hot
Pin 1
Pin 2
Pin 3
10
Pin 3 = Data True (positive)
5-Pin XLR Male (In)
Pin 1
Pin 2
Pin 3
Do Not Use
Do Not Use