LSC Lighting ePRO - Manual (Page 11)

ePRO Dimmer
Operator Manual V3.0
8
5 DMX EXPLAINED
DMX512A is the industry standard for the
transmission of digital control signals between
lighting equipment. It utilises just a single pair of
wires on which is transmitted the level information
for the control of up to 512 DMX slots (addresses
or channels).
When good quality data cables are used,
DMX512 cable runs may be up to 1,000 metres in
length. When several DMX cables are required to
service different locations, DMX512 splitters can
be used. Each splitter provides multiple isolated
DMX512 outputs.
The ePRO dimmer provides a “DMX Thru” output
allowing you to loop the DMX signal from one
ePRO onto the next. ePRO dimmers have Auto
DMX termination which will automatically
terminate the last dimmer at the end of the DMX
cable.
5.1 Cable selection
Do not use unscreened microphone or low speed
data cables for DMX. This can cause problems in
the DMX network. Make sure the cable conforms
to the EIA485 cable requirements by providing the
following specifications:
Low capacitance
One or more twisted pairs
Foil and braid shielded
Impedance of 85 -150 Ohms, nominally 120
Ohms
22AWG gauge for continuous lengths over 300
metres.
5.2 Typical DMX Installation
In the diagram below the DMX signal from the
controlling console is connected to a MDR splitter
which provides multiple isolated DMX outputs.
The output cables can then be run to various
locations where dimmers and other equipment are
installed. In the event of a fault on one of the
cables, the other outputs from the MDR splitter
will not be affected.