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RS485 (DMX/RDM) Cable Terminations
Loop a shielded twisted pair cable (eg Belden 9841, though
many people now use a CAT5e cable) from the
control/monitoring point, around all enclosures.
Maximum total cable length is 1,200M (4,000ft). For longer
runs and wildly distributed systems, use a DMX/RDM
splitter (make sure that it supports RDM) and multiple
cable runs.
Use the termination switch to terminate each RS485 cable
run at the last enclosure on each run.
Luminaire Power Control using DMX512
The DEC4 controller includes a 30A 2-pole relay that
protects the enclosed equipment in the event of a serious
high temperature event by cutting off power.
You may use DMX512 to control power to the luminaire
inside the enclosure. This is very useful in hot locations,
where the luminaire may be stressed by being held in
standby mode all day under hot sun. By powering the
luminaire down it will tolerate much higher temperatures
without harm.
Tempest recommends the JESE RDM-TRI interface to
monitor enclosure status in any installation and control the
enclosure power relay in smaller systems.
More complex installations are very likely to include some
kind of show control system that will certainly include DMX
control. This is the preferred method of controlling power
to the luminaires.
Tornado G4 User Manual
RS485 Line
Termination
(LT) Switch:
TERMINATED
Data + Data - Common Data + Data - Common
JESE RDM-TRI interface connects to
a PC via USB to monitor and control
a network of Tempest enclosures.
Tempest Item # 2000.195
DATA OUT
DATA IN
Tempest recommends
the JESE SH8 DMX/RDM
Splitter for large or
complex RS485
networks.
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