Product manual

TAC Xenta Server – Gateway, Technical Manual B Protocols
Schneider Electric Buildings AB, June 2011 175 (184)
04-00124-06-en
B.8.1 C-Bus Lighting Networks
Each C-Bus Lighting Network consists of a number of input and output
nodes. An output node can be a relay or a dimmer that is connected to a
bank of lights. An input node can be either human-operated or auto-
mated, and can cause messages to be sent to any output nodes OVER
the C-Bus to control these banks of lights. Optional C-Bus bridges can
be used to extend the number of nodes on a network.
To allow flexible control without re-wiring, the C-Bus system also
allows one or more banks of lights to be assigned to logical groups. Sub-
sequently, Input nodes can be programmed to direct messages to these
logical groups using Group Variables. Hence control of a group can be
achieved without knowledge of the network architecture or its node
addressing. Group Variables can be assigned a number between 0 and
254 (hex 00 to FE), allowing a maximum of 255 lighting groups in a sin-
gle application.
Each Group Variable belongs to a single C-Bus lighting application. On
smaller networks there may be only a single lighting application, but on
larger networks more may be used to further partition the control logic.
Applications can be assigned a number between 48 and 95 (hex 30–5F),
although 56 (hex 38) is the default for lighting applications.
Note
• Currently the SP9121 CBus C-Bus Xenta 913 only supports
lighting applications, and does not explicitly support inter-bridge
routing. If any C-Bus Bridges are employed then these should be
configured to transparently pass lighting messages as applicable.