A.D.J. Supply Europe B.V.
– www.americandj.eu – Mega QPlus Go Instruction Manual Page 8
DMX SET UP (continued)
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.
Figure 2
XLR Pin Configuration
Pin1 = Ground
Pin2 = Data Compliment (negative)
Pin3 = Data True (positive)
Figure 3
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 errors and
avoids signal transmission problems and
interference. It is always advisable to
connect
a
DMX
terminal,
(Resistance120 Ohm 1/4 W) between
PIN 2 (DMX-) and PIN 3 (DMX +) of the
last fixture.
Figure 4
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 fixtures may be implemented in a 3-pin DMX line. When inserting standard 5-pin data
cables in to a 3-pin line a cable adaptor must be used, these adaptors are readily available at most electric
stores. The chart below details a proper cable conversion.
3-Pin XLR to 5-Pin XLR Conversion
Conductor
3-pin XLR Female (Out)
5-pin XLR Male (In)
Ground/Shield
Pin 1
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