Ethernet/Cresnet Interface Crestron CEN-CN
6 •• Ethernet/Cresnet Interface: CEN-CN Operations Guide - DOC. 5721
network port, the load factor of that unit is the load factor of the entire run. The
length of the run in feet and the load factor of the run should be used in the following
resistance equation to calculate the value on the right side of the equation.
Resistance Equation
R = Resistance (refer to next table).
L = Length of run (or chain) in feet.
LF = Load factor of entire run (or chain).

R < L x LF

40,000 Where:

The required wire gauge should be chosen such that the resistance value is less than
the value calculated in the resistance equation. Refer to the table below.
Wire Gauge Values
RESISTANCE (R) WIRE GAUGE
416
618
10 20
15 22
13 24 (Double-CAT 5)
NOTE: All 4-wire 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.
NOTE: When daisy-chaining Cresnet units via 4-wire Cresnet wiring, always twist
the ends of the incoming wire and outgoing wire which share a pin on the network
connector. After twisting the ends, tin the twisted connection with solder. Apply
solder only to the ends of the twisted wires. Avoid tinning too far up the wires or the
end becomes brittle. After tinning the twisted ends, insert the tinned connection into
the Cresnet connector and tighten the retaining screw. Repeat the procedure for the
other three conductors.
Configuration Setup
To configure the CEN-CN, a local PC that contains a Crestron Viewport is required.
The Viewport is one of the development tools that is part of Crestron’s SIMPL
Windows or VisionTools Pro-e (VT Pro-e) control software applications.

Installing Crestron Development Tools

Crestron control software is available in an electronic form; CD-ROM, email, or
from Crestron’s website. Regardless of how and from where the software is
obtained, this section provides the necessary installation steps.
NOTE: The latest versions of these applications are available from Crestron’s
website (www.crestron.com). Crestron ControlCD also contains a version (which
may not be as current as the website version). To obtain a free copy of the CD-ROM,
contact Crestron at 1-888-CRESTRON [1-888-273-7876]. Alternatively, complete a
literature request from the Crestron website to obtain one.