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C-Bus™ Basic Programming 1250SM0904R10/09

C-Bus™ Products Training Course 10/2009

When terminating C-Bus cable conductors by twisting wires together,

ensure the bare copper of both wires are securely twisted together. Also

check that the:

 conductors are not over twisted (try to keep it to about 5 twists)

 copper wires have not been nicked (to reduce potential cable breaks)

 copper wires are not soldered together (cold creep might occur with

soldered wires)

 copper wires are not frayed

 stripped conductor length is kept to a practical minimum

 insulation is not damaged.

C-Bus Cable

Figure 17 - Terminating C-Bus pairs by twisting the cable

When terminating the C-Bus cable with an RJ45 plug, ensure that the RJ45

has been wired with the correct pin out.

Pin Wire Function Wire 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

1 2 3 4 5 6 7 8

RJ45 with clip facing down

Table 13 - C-Bus RJ45 pinouts

Cable Length

The maximum amount of C-Bus cable that can be installed into a single

C-Bus network is 1km. Exceeding this maximum cable length can:

 Distort and corrupt C-Bus messages

 Cause excessive voltage drop across the C-Bus cable.

As a rule of thumb, try not to use more than 3 boxes of Cat-5, Cat-5E, or

Cat-6. Each box contains

1000 feet of cable; therefore 3 boxes of Cat-5 will ensure you have used a

maximum of 3000 feet.

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