User Guide

Crestron CNMSX Integrated Control System
Resistance Equation
R = Resistance (refer to table below).
L = Length of run (or chain) in feet.
PF = Power factor of entire run (or chain).
R <
L x PF
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 after this paragraph.
Wire Gauge Values
RESISTANCE (R) WIRE GAUGE
4
16
6
18
10
20
15
22
13
Doubled CAT5
8.7
Tripled CAT5
NOTE: All network 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, 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.
Four-Pin Network Connector
For four-pin network cable connections in a Crestron remote control system, the
Cresnet cable is used to power Crestron devices. Before making any four-pin network
connections to the CNMSX, refer to the network interconnection after this paragraph.
Recommended Network Cable, Liberty Wire Reference: Cresnet
NETWORK DEVICE
BLACK
BLUE
WHITE
NETWORK
RECOMMENDED COLOR CODE
BLACK
REFER TO LATEST REVISION OF DOC. 5411.
WHITE
BLUE
RED
GND
=
24
=
=
=
(-) Z
(+) Y
PAIR B
PAIR A
TWISTED
PAIR A
PAIR B
TWISTED
CONTROL SYSTEM
G
Y
2
4
FRONT VIEW
Z
TO
RED
BLUE
WHITE
SHIELD
BLACK
RED
G
24
Y
Z
TO OTHER
24
Z
G
FRONT VIEW
Y
TO
DEVICE
Modular Network Connector
For modular cable connections in a Crestron remote control system, the six-conductor
modular cable is used to power Crestron devices. That cable must be rated for 30
Operations Guide - DOC. 8118B Integrated Control System: CNMSX • 13