Rainbow RCC 100, Manual, Page: 10 / 22

DMX System
Drawing:
General:
The DMX signal from a control desk is fed into the splitterbox together with the 24V DC
from the power supply unit. The power/control signal link is distributed from the splitterbox
in 4 paralell outputs. Each output can support up to 12 individual scrollers. This makes a
possible total of 48 scrollers/splitterbox. Make sure trat you connect the return cable from
the last unit to the splitterbox to ensure reliable functioning. Each scroller is given an
address with the switches at the back of the scroller. T power more than 24 units from one
splitterbox, you will have to use the option of connecting two 24 unit power supplies in
parallel.
Return connection:
The return connection from the last scroller back to the splitterbox ensures sufficeint power
for the scrollers within the loop. It also serves the the purpose of a correct termination for
the DMX signal. You can replace the return cable with a terminator plug in the last scroller
of each output – providing the speed of the last scroller isn´t affected by not having a
return cable. A terminator plug is made of a male 4-pin XLR connector with a 100Ohm
resistor between pin 2&3.
Analog desk – DMX system:
If you want to run the scrollers in DMX mode from a control desk with an Analog output,
you will need an Analog to Digital converter. DMX gives easy patching of channels to the
scrollers.