Crestron CNX-B4 Installation Guide download pdf (Page 12)

Single Gang Keypads Crestron CNX-B2/B4/B6/B8/B12

8 • Single Gang Keypads: CNX-B2/B4/B6/B8/B12 Operations & Installation Guide - DOC. 8173A

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 below.

Wire Gauge Values

RESISTANCE (R) WIRE GAUGE

Doubled CAT5

8.7

Tripled CAT5

NOTE: All 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, 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.

Identity Code

Every equipment and user interface within the network requires a unique

identity code (NET ID). These codes are recognized by a two-digit

hexadecimal number from 03 to FE. The NET ID of each unit must

match an ID code specified in the SIMPL Windows program. Refer to

“Setting the Net ID in Device Settings” on page 17 for details of the

SIMPL Windows procedure.

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Crestron CNX-B4 Installation Guide Page 12