Update of Terminals on Digital Bus SCS (Tegui/Bticino)

The architecture of Legrand (Tegui/Bticino) video intercom systems is based on a 2-wire non-polarized Bus under the SCS communication protocol.

This technology allows simultaneous transmission of data, audio, video, and power, maintaining high signal stability even in older installations.

The Technological Backward Compatibility Concept

The great competitive advantage of this system is that the "brain" of connectivity resides in the terminal (monitor), not in the bus infrastructure or the door panel.

Therefore, we can perform a Wi-Fi Upgrade by replacing the user terminal, as long as the existing installation is SCS 2-wire.

Technical Feasibility Analysis by Models

Any terminal operating under the SCS protocol can be replaced by a new generation monitor with an integrated Wi-Fi Gateway.

Original Terminal Bus Architecture Compatibility with Wi-Fi Monitor
Swing / Polyx / Classe 100 V12 Range 2-Wire Bus (SCS) Full. The bus supports the data flow required for the new terminal.
Series 8 / Classe 100 V16 2-Wire Bus (SCS) Full. These are current 2-wire models without native connectivity.
Series 7 (Digital) Old Digital System None. Requires interface converter or complete system replacement (Kit).
Europe / Siete Series 4+N / Coaxial System Nonexistent. Analog architecture incompatible with digital bus.

Migration Procedure (Commissioning)

To integrate a new Classe 100X or Classe 300 EOS monitor into an existing bus column, the technical process consists of three stages:

  1. Physical Configuration Mapping: It is essential to replicate the addressing of the old terminal. The configurator of the N (apartment number) and P (associated door panel) must be extracted and reinserted into the new device. These configurators are calibrated resistors that assign the logical address on the bus.

  2. Connection Interface: Connection of the BUS terminals (terminal 1 and 2). Being non-polarized, there is no risk of phase inversion, although it is recommended to maintain consistency throughout the column.

  3. IP Provisioning: The terminal acts as an IoT node. Once powered by the bus (or via an additional 1-2 power supply if the bus load is critical), the monitor creates an Access Point (AP) for pairing through the Home + Security App via a 2.4GHz WLAN network.

Power Considerations

When installing a Wi-Fi monitor (such as the 300 EOS), the current consumption on the bus increases.

It is technically necessary to verify if the current power supply (e.g., Ref. 346050) has sufficient amperage available or if an additional local power supply is required for the monitor if the distance to the central node exceeds voltage drop limits.

Would you like us to analyze the bus load calculation for an installation with multiple Wi-Fi monitors?