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What is Clipsal C-Bus?
Introduction
C-Bus is a microprocessor-based control and management system
for Buildings and Homes. It is used to control lighting and other electrical
services such as pumps, Audio Visual Devices, Motors, etc. Whether simple ON/OFF
control of a lighting circuit, or variable (analogue) type control, such as
electronic dimmable fluorescent ballasts, C-Bus can be used to easily control
virtually any type of electrical load.
To ensure fast and reliable operation, each C-Bus device has
its own in-built microprocessor and “intelligence”, allowing units to be
individually programmed.
C-Bus uses a patented method for updating the status of units.
This method does not require a central computer or central controller to handle
databases or lookup tables to operate. The status of each C-Bus unit is
initiated at specific time intervals, without the need of a central controller.
Each device is allocated a specific time frame to broadcast its status,
synchronised by a self-generated system clock pulse. This allows large amounts
of data to be transmitted in a very small time frame, effectively and reliably
on the network, leading to low processing overheads and low bandwidth
requirements.
Why C-Bus?
The primary reasons to use C-Bus are:
- Highly robust and reliable control system, but low cost per
node.
- Wide range of tools available to allow 3rd party companies to
interface to both PC based and embedded systems.
- A single C-Bus cable connection can control an unlimited
number of devices.
- Ultimate flexibility in switching and control – functions can
be changed, added, removed, moved, reprogrammed, at any position on the network,
at any time - without any cumbersome hard-wiring.
- C-Bus is simple to install and commission.
- C-Bus can control any type of load, digital and analogue.
Simple Control
Each C-Bus device is programmed to issue and respond to the
certain commands. A virtually unlimited number of commands can be programmed
into the C-Bus system. Generally, Input Devices are programmed to issue
commands, and Output Devices are programmed to execute those commands.
When a C-Bus Group Address command is issued by a C-Bus Device,
any other Devices that have been programmed with that Group Address will be
activated, wherever they are on the C-Bus Network. There is no need for any
direct 240V connection between any C-Bus units.
Multiple Events
Single Devices can also produce multiple events. For example,
you may program an Input Switch so that the length of time the key is pressed
determines what Command is issued - a short press issues an on/off command and a
long press controls a dimming command.
Multiple commands do not have to control the same Output
Device(s), so complex scenarios can be easily created, for example a single push
button switch controlling a whole floor of a building.
Multiple Input devices can conditionally control a single
Output Device, dependant on specific circumstances. This allows multiple levels
of over-ride switching and other complex control systems to be created easily.
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