User Guide

Wall Mount LCD Controller Crestron APAD
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
40,000
Where:
R x P
L <
L = Length of run (or chain) in feet.
R = 6 Ohms (Crestron Certified Wire: 18 AWG (0.75 MM
2
))
P = Cresnet power usage of entire run (or chain).
Make sure the cable length value is less than the value calculated on the right side of
the equation. For example, a Cresnet run drawing 20 watts should not have a length of
run more than 333 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 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 the Crestron corporate headquarters at 1-888-CRESTRON [1-888-273-7876].
For assistance in your local time zone, refer to the Crestron website
(http://www.crestron.com/
) for a listing of Crestron worldwide offices.
You can also log onto the online help section of the Crestron website to ask
questions about Crestron products. First-time users will need to establish a user
account to fully benefit from all available features.
20 • Wall Mount LCD Controller: APAD Operations & Installation Guide – DOC. 6455