The C-Bus Network Bus is the communications wiring for the system, consisting of an unshielded twisted pair (UTP) ‘Cat 5’ cable. The Bus not only provides the means of communication between units, but also the small amount of power needed to operate the circuitry within each C-Bus unit.
The C-Bus Network is electrically isolated from the mains power, & operates at safe extra low voltage levels (36 V dc). Legal restrictions of mains wiring do not apply, so C-Bus wiring may be run into places that would be dangerous (or illegal) with normal mains wiring.
All Input & Output devices are wired to any point in the C-Bus Network by a twisted pair cable, which carries all communications between the Units.
The C-Bus connections may be looped from unit to unit or a branch can be made at any point. This ‘free topology’ structure provides a flexible system layout. New units can be added anywhere, at any time, without re-configuration.
During commissioning, the system is programmed so that specific commands trigger specific responses in one (or more) devices on the Network. At any time the commands can be re-programmed, & C-Bus units can also be added, removed or moved.
The size of a C-Bus Network is practically unlimited. A large network is usually divided into sub-networks of 100 C-Bus Units, with a total cable length of 1000m per sub-network. This allows a C-Bus system to be divided into manageable sections, simplifying design, limiting potential fault propagation & aiding in any troubleshooting.