20
CABLE SELECTION
We recommend the following Belden signal cables:
•
Indoor exposed or inside conduit above grade: . . . . . . . . . . . . . . . . . . . . Belden 9842
•
Indoor plenum: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Belden 82842
•
Outdoor exposed, direct burial, or inside conduit below grade: . . . . Belden 3107DB
Suitable alternative cables must meet all of the following requirements:
•
Construction: Shielded, twisted pair (or multi-pair).
•
Impedance: Between 90 and 120Ω.
•
Capacitance: 15pF or less.
GENERAL CABLING REQUIREMENTS
Ensure that:
•
The mains input is derived from a suitable overload-protected supply.
•
All cable access points, plus the enclosure cover are correctly sealed.
•
All local codes are followed during planning and installation.
•
Only suitable cable connectors are used within the junction box.
•
Connections are made, inspected and certified by a qualified electrician.
TIPS FOR ACHIEVING SUCCESSFUL DMX CONTROL
•
Do not exceed a total cable length of 1,500 ft (457m) without buffering.
•
Do not exceed a total of 32 fixtures on a single line without buffering.
•
Use only connection cables with a characteristic impedance of 120Ω, preferably where
the DMX + and DMX – data lines are twisted around each other and the ground link exists
as a coaxial screen surrounding the inner cores.
•
Connect a 120Ω terminating resistor between the DMX + and DMX – output connections
of the final fixture.
•
Do not introduce a passive Y-split into the control cabling. If it is necessary to split the
control link in order feed fixtures located in different directions, use a powered DMX
splitter/buffer.
•
Ensure that the DMX + and DMX – connections do not become crossed at any point.
WIRED DMX CONTROL
When connecting multiple fixtures (not using the Outdoor Linking System) connect the
DMX output of the controlling device to the input wires of the first fixture and feed the
output of that fixture to the next. The final fixture in the line should have a 120Ω terminating
resistor connected between its DMX + (red/white) and DMX – (black/white) output lines:
Summary of Contents for Unity SNS2019
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Page 50: ...48 DIMENSIONS...
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