Isys i/O
®
Tilt Touchpanel Media Center
Crestron
TPMC-12
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 (101 meters). If
Cresnet HP is used for the same run, its length could extend to 1250 feet (381
meters).
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
Use of a Cresnet Hub/Repeater (CNXHUB) is advised whenever the number of
Cresnet devices on a network exceeds 20 or when the combined total length of
Cresnet cable exceeds 3000 feet (914 meters).
Reference Documents
The latest version of all documents mentioned within the guide can be obtained from
the Crestron website (
). 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
MediaManager Applications Guide
QM-TX QuickMedia Transmitter
TPMC-CH-IMC Interface Module
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].
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.
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Isys i/O
®
Tilt Touchpanel Media Center: TPMC-12
Operations Guide – DOC. 6675A
