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Crestron CLS-C6RF
When calculating the length of wire for a particular Cresnet run, the wire gauge and the
Cresnet power usage of each network unit to be connected must be taken into
consideration. Use Crestron Certified Wire only. If Cresnet units are to be daisy-chained
on the run, the Cresnet power usage of each network unit to be daisy-chained must be
added together to determine the Cresnet power usage of the entire chain. If the unit is a
home-run from a Crestron system power supply network port, the Cresnet power usage
of that unit is the Cresnet power usage of the entire run. The wire gauge and the Cresnet
power usage of the run should be used in the following equation to calculate the cable
length value on the equation’s left side.
Cable Length Equation
L = Length of run (or chain) in feet
R = 6 Ohms (Crestron Certified Wire: 18 AWG (0.75 MM ))
or 1.6 Ohms (Cresnet HP: 12 AWG (4 MM ))
P = Cresnet power usage of entire run (or chain)
2
2
L <
40,000
R x P
Where:
Make sure the cable length value is less than the value calculated on the right side of the
equation. For example, a Cresnet run using 18 AWG Crestron Certified Wire and
drawing 20 watts should not have a length of run more than 333 feet. If Cresnet HP is
used for the same run, its length could extend to 1250 feet.
NOTE: All Crestron certified Cresnet wiring must consist of two twisted pairs. One
twisted pair is the +24V conductor and the GND conductor, and the other twisted pair is
the Y conductor and the Z conductor.
Strip and Tin Wire
When daisy-chaining Cresnet units, strip the ends of the wires carefully to avoid nicking
the conductors. Twist together the ends of the wires that share a pin on the network
connector, and tin the twisted connection. Apply solder only to the ends of the twisted
wires. Avoid tinning too far up the wires or the end becomes brittle. Insert the tinned
connection into the Cresnet connector and tighten the retaining screw. Repeat the
procedure for the other three conductors.
Add Hubs
For larger networks (i.e., greater than 28 network devices), it may become necessary to
add a Cresnet Hub/Repeater (CNXHUB) to maintain signal quality throughout the
network. Also, for networks with lengthy cable runs, it may be necessary to add a
Hub/Repeater after only 20 devices.
Reference Documents
The latest version of all documents mentioned within the guide can be obtained from
the Crestron website (http://www.crestron.com/manuals
). This link will provide a list
of product manuals arranged in alphabetical order by model number.
List of Related Reference Documents
DOCUMENT TITLE
2-Series Control Systems Reference Guide
CAT5 Wiring Reference Guide
Crestron e-Control Reference Guide
RoomView Reference Guide
Further Inquiries
If you cannot locate specific information or have questions after reviewing this
guide, please take advantage of Crestron's award winning customer service team by
calling Crestron at 1-888-CRESTRON [1-888-273-7876].
• iLux
™
Integrated Lighting System w/infiNET
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: CLS-C6RF Operations Guide - DOC. 6418A
40