CNX Dual Processor Modular Control System
Crestron
CNRACKX-DP
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.
Preparation for Use
Refer to the hookup diagram on the next page. Aside from attaching power last,
complete the connections in any order. The serial cable to the PC may be attached to
the DB9 connector (COMPUTER) of the CNRACKX-DP front panel or either
CNXCPU.
CAUTION:
The external power supply provides power to the CNRACKX-DP and
its expansion cards and is
NOT
designed to fulfil the power requirements of all
devices in a Cresnet system. Depending upon the load factor(s) of the devices, power
supplies and wiring that are independent of the CNRACKX-DP may be required.
Refer to
on page 9 for additional information.
CAUTION:
The CNRACKX-DP is designed to be operated with only
one
CNPWS-75 or CNPWSI-75 External Power Supply. Do not connect more than one
power supply to the CNRACKX-DP.
CAUTION:
To prevent overheating, do not operate this product in an area that
exceeds the recommended ambient temperature of 104
°
F (40
°
C). Consideration must
be given if installed in a closed or multi-unit rack assembly since the operating
ambient temperature of the rack environment may be greater than the room ambient.
Contact with thermal insulating materials should be avoided on all sides of the unit.
CAUTION:
Care must be given to connecting units to the supply circuit so that
wiring is not overloaded. The ratings on the supply input should be considered in this
concern. Refer to
on the previous page for further information.
CAUTION:
If making connections to the modular port labeled CRESNET,
DO
NOT
use 6-conductor telephone cables. Telephone cables are wired in a crisscross
fashion and are not compatible with Crestron equipment. Refer to the latest revision
of Modular Cable Requirements (Doc. 5682). This document can be obtained from
10
•
CNX Dual Processor Modular Control System: CNRACKX-DP
Operations Guide - DOC. 8151
