SRG Engineering — multi-protocol acquisition for energy optimisation

Meter and HVAC data acquisition across the full Weble gateway lineup, with CSV files pushed by FTP into the in-house Optimize platform.

The context

SRG Engineering is a Swiss interdisciplinary engineering consultancy with offices in Geneva, Carouge, Lausanne, Villars-Ste-Croix and Fribourg. Its energy department covers building energy optimisation: audits, data management, energy accounting, large-consumer programmes, Minergie certification, photovoltaics and building physics.

To turn that data into action, SRG relies on its in-house Optimize platform, which consolidates multi-site consumption and feeds the reports delivered to building owners.

Visit srg-engineering.ch

The need

  • Multi-protocol acquisition on heterogeneous installations: M-Bus meters, Modbus RTU/TCP controllers, OBIS (IEC 62056) electricity meters and existing KNX systems.
  • Timestamped CSV file generation directly consumable by the Optimize platform.
  • Automatic FTP upload to SRG servers, with recovery after network outages.
  • One reproducible hardware stack across dozens of sites — from cabinet-mounted controllers to remote sites with no IT infrastructure.
  • Remote maintenance and configuration from SRG offices, with no truck roll for every adjustment.

The solution deployed

SRG Engineering deploys the entire Weble gateway lineup, picked site by site depending on size and available connectivity:

  • WBox S103 — compact sites with few points to read.
  • WBox S485 — commercial buildings with serial buses and Ethernet, in a compact DIN rail form factor.
  • WBox S485 KNX — buildings with an existing KNX installation to integrate.
  • WBox G110 — multi-bus sites needing local logic and extended I/O capacity.
  • WBox E413-LTE — remote sites with no existing IT connectivity, autonomous over 4G.

Weble drivers cover every protocol encountered on customer sites:

  • M-Bus Driver — thermal and fluid meters over wired or wireless M-Bus.
  • Modbus Driver — controllers and HVAC equipment over Modbus RTU and Modbus TCP.
  • OBIS Driver (IEC 62056) — electricity meters with standardised readout.
  • KNX Driver — point acquisition on existing KNX buses.
  • CSV Driver — timestamped serialisation of acquired data as CSV.
  • FTP Driver — automatic upload of CSV files to the SRG server.

Two modules complete the operational stack:

  • Remote access module — every gateway is reachable from SRG offices for commissioning, point updates and troubleshooting.
  • Monitoring module — local energy dashboards built on the gateway itself, complementing the Optimize platform with on-site visualisation.

The benefit

  • A single hardware platform across every site — the SRG engineer picks the gateway, not the ecosystem.
  • Full protocol coverage: no meter or equipment is left out of the acquisition.
  • End-to-end automation from the field measurement to the CSV file delivered into Optimize.
  • Centralised maintenance from SRG offices, keeping operational costs predictable.
  • Immediate local visualisation via the monitoring module, with no cloud dependency.