Clipsal C-Bus Instruction Manual download pdf (Page 43)

1250SM0904R10/09 C-Bus™ Basic Programming

10/2009 C-Bus™ Products Training Course

C-Bus Clock

When referring to a C-Bus Clock, we refer to a pulse that establishes and

synchronises communications on a C-Bus network. Without a C-Bus clock

you will not be able to operate or program any C-Bus units.

Each C-Bus network can only have one C-Bus clock active. Although there

can only be one active C-Bus Clock on a network, more can be enabled to

offer some basic redundancy.

It is recommended that each C-Bus network has a maximum of 3 C-Bus

clocks enabled on it. An internal algorithm will decide which clock will be

active, and will then deactivate the remaining enabled clocks.

When enabling a C-Bus Clock, try to enable it in the centre of the C-Bus

network to avoid attenuation and distortion due to:

 cable length

 cable capacitance

 general interference.

The C-Bus Clock is actually a 5 Vp-p pulse that is superimposed onto the

C-Bus DC Voltage. The C-Bus clock can only be viewed using an

oscilloscope. The figure below shows a C-Bus clock as viewed through an

oscilloscope.

Figure 28 - A C-Bus clock viewed using an oscilloscope

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Clipsal C-Bus Instruction Manual Page 43