Clipsal C-Bus Especificações descarregar pdf (Página 19)

1A. Introduction to C-Bus

The Clipsal C-Bus data cable is strongly recommended due to its distinctive pink outer sheathing.

This reduces confusion between a C-Bus network and information systems (such as data, ﬁre and

telephone), at the same installation. The Cat-5 UTP also has a 240V mains rated outer sheath. This is

a requirement where the cable enters a switchboard, and is present in the same enclosure as single

insulated mains wire.

The RJ45 end is an 8-position modular connector that looks like a large phone plug. There are

a couple variations available. The primary variation you need to pay attention to is whether the

connector is intended for braided or solid wire. For braided/stranded wires, the connector has

contacts that actually pierce the wire. For solid wires, the connector has ﬁngers, which pierce the

insulation and make contact with the wire by grasping it from both sides. The connector is the weak

point in an ethernet cable, choosing the wrong one will often cause grief later. If you just walk into a

computer store, it’s pretty impossible to tell what type of connector it is, if it isn’t speciﬁcally labelled.

Strain relief boots are somewhat helpful sometimes.

The C-Bus connectors are wired as a standard patch lead, as shown in Table 1.

Pin Connection Colour

1 Remote Override ON Green &

white

2 Remote Override ON Green

3 C-Bus Negative (-) Orange &

white

4 C-Bus Positive (+) Blue

5 C-Bus Negative (-) Blue &

white

6 C-Bus Positive (+) Orange

7 Remote Override OFF Brown &

white

8 Remote Override OFF Brown

RJ45 pictured with clip facing down.

Table 1 – C-Bus connector identiﬁcation

4.6 Standard Network Topology

C-Bus units can be wired together in a number of different ways. They can be “daisy chained”

together. This uses the least amount of cable but may cause excessive voltage drop over long runs.

(Spreading C-Bus power supplies or output units with in-built power supplies around the network, will

address this).

Alternatively C-Bus units can be “star wired” back to a central point, such as a switchboard where the

output units are mounted. This limits voltage drop but may use more cable.

In most cases the most suitable topology is a combination of daisy chain runs, which are star wired

out from output unit locations.

Ring topologies are not recommended. While they offer some redundancy in case of broken or

damaged wires, ring topologies can provide parallel communication runs that may result in distorted

waveforms and “race” conditions.

A calculator tool and information regarding voltage drop across networks is available at

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