JANDS DD-8 DMX SPLITTER
Revision 2.0 - 5 July 1998
OPERATING MANUAL
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1.0 Introduction
The JANDS DD-8 is a high quality 8 channel opto-isolating data splitter specifically
designed for distributing one DMX-512 input signal to eight destinations. It is designed
to perform two functions - to isolate faults, and to provide signal amplification where
long cable runs are used.
When a fault occurs, it is possible to get high voltages in the DMX cabling. Such
voltages can propagate along the cable and damage all equipment connected to that
cable. The DD-8 is designed to sever the physical link between elements of the DMX
system, thereby isolating faults on one line from the rest of the system. The DD-8 is fully
protected against internal damage from most such faults. Since these faults can occur in
all systems, the DD-8 is equally suitable for all touring, theatre, exhibition and trade
show applications. In addition, including the DD-8 in a DMX system makes fault finding
relatively simple.
The DD-8 can also be used as a signal amplifier where extremely long cable runs are
necessary, or can be used to drive more than the normal maximum of 32 devices from a
console. It is recommended a DD-8 be used to isolate DMX segments that run to
equipment that is powered from different supplies. Outdoor systems where the console
runs from a separate supply to the dimmers are an example of such systems.
The DD-8 is designed to run from most mains power systems. It will accept an input
voltage from 90 to 130V, or 190 to 265V. The input voltage is set by the user at the
back panel.
The DD-8 is packaged in an all-steel enclosure and is designed to mount in a standard 19
inch rack. The DD-8 occupies one rack space.
