Crestron CP2E Specifications download pdf (Page 23)

Crestron CP2 & CP2E 2-Series Compact Control System

CAUTION: Provide sufficient power to the system. Insufficient power can lead to

unpredictable results or damage to the equipment. Please use the Crestron Power

Calculator to help calculate how much power is needed for the system

(http://www.crestron.com/calculators

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)

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

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

Operations Guide – DOC. 5980A 2-Series Compact Control System: CP2 & CP2E • 19

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Crestron CP2E Specifications Page 23

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