Bus SCS
SCS is an acronym for "Sistema Cablaggio Semplificato" ("Simplified Cable Solution"). It uses a fieldbus network protocol and has applications in the field of home automation and building automation. It is used mainly in bTicino and Legrand installations.
An SCS bus is based on a sheathed twisted pair formed of two flexible conductors; these are braided and unshielded with isolation 300/500V, SELV as double isolation is required – according to the rules adopted by CEI (International Electrotechnical Committee). The bus is unpolarized, devices are required to support the DC power supply in both polarity.
Two kind of wiring are possible:
Across the SCS bus four different types of signals are transmitted in frequency modulation:
The transmission protocol is the CSMA/CA.
Through the SCS bus you have the following functions:
All the listed functions share the same technology and the same procedures for configuration / installation.
All devices connected to SCS bus must be manually configured, no autolearn is possible, apart Alarm system and extenders. Configuration assign an address and an operating mode. Two kind of configurations are possible:
Device addressing use three different 'digits' A|PL|GR. The A mean the room, the PL is the Point of Load in the room, and GR is the group. Group join loads in same or different rooms in a logical manner. Not all devices has group addressing. All devices must answer to room broadcast called AMB. All devices must answer to general broadcast called GEN. Physical and Virtual addressing has different limitations:
In big houses and buildings, SCS address extension is possible, were different address domains are connected via some bridges. Only some kind of messages can cross a bridge. Here the values of physical configuration jumpers:
Devices connected to the SCS bus are IMQ-certified and comply with these product standards (International Electrotechnical Commission (IEC) EN 50428 - IEC EN 60669-1/A1 - IEC EN 60669-2-1 - IEC EN 50090-2-2 - IEC EN 50090-2-3 ).
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