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8
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.
3
1
Termination reduces signal errors and avoids signal
transmission problems 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. 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 adapter must be used, these adapters are readily available
at most electric stores. The chart below details a proper cable conversion.
Mega QA Go
DMX Setup
2
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
