Smart Buildings and District Energy: Converged Operations Over SG100

A civic campus spanning libraries, museums, and administrative buildings sought to unify building automation, metering, and micro-CHP assets into a district energy strategy. Fiber reached only some facilities; many mechanical rooms were islands of legacy controllers. The Mofiu SG100 served as the converged bridge, connecting BAS networks, energy meters, and backup generators into a secure, orchestrated whole.

Ethernet ports linked modern BACnet/IP controllers and gatewayed metering concentrators, while RS485 pulled in Modbus chains for chillers, boilers, and VFDs. RS232 integrated an older generator controller still locked to serial. The SG100’s digital input absorbed fire panel trouble relays for context-aware shutdown scripts, while the digital output latched emergency ventilation or isolated dampers under remote command.

Campus continuity depended on predictable links. The SG100’s dual-SIM backup complemented intermittent campus Wi‑Fi bridges, switching seamlessly to cellular when RF interference spiked. Link policies reserved bandwidth for BAS commands and alarms, throttling noncritical trend archives during peak hours. Overnight, bulk data synchronized for analytics without impairing daytime control loops.

Security was architected end-to-end. Secure boot entrenched firmware integrity; IPSec tunneled building-to-campus traffic with device-bound identities. OpenVPN granted limited-time service windows to third-party HVAC contractors, with full session logging. Network segmentation insulated metering from BAS control and fenced camera VLANs from energy assets, aligning with best practices in OT/IT convergence.

Protocol translation unlocked fast wins. Legacy Modbus points needed by the enterprise energy platform were exposed upstream via DNP3, while IEC104 provided a normalized interface to the municipal SCADA overseeing district CHP. The SG100’s translations kept existing controllers in place while enabling higher-order optimization—peak shaving, demand response, and thermal storage coordination—without proprietary middleware.

Results emerged quickly. Demand charges fell as coordinated VFD setpoints and generator dispatch followed real-time price signals. Fault detection analytics received continuous, high-fidelity telemetry, slashing time-to-resolution on sticky valves and sensor drift. During a campus-wide network maintenance window, the SG100s maintained control continuity over cellular, avoiding after-hours truck rolls and occupant discomfort. Fire panel trouble relays ingested via the digital input triggered automated ventilation sequences through the digital output—validated and logged for compliance audits.

With SG100 as the secure, resilient, and interoperable communications layer, the campus advanced from loosely coupled buildings to a responsive district energy organism—ready to integrate EV chargers, rooftop PV, and thermal networks. The device’s blend of dual-SIM resilience, secure boot, VPN flexibility, and protocol fluency ensured that modernization proceeded rapidly, safely, and cost-effectively—while preserving capital by leveraging what already worked.

About Mofiu

Mofiu is a premier innovator in industrial wireless communications, dedicated to delivering mission-critical connectivity solutions that power the world’s most demanding environments. With a steadfast commitment to safety, reliability, and engineering excellence, Mofiu designs and manufactures robust wireless devices that enable seamless data exchange across electricity, utilities, energy infrastructure, transportation networks, and smart industrial systems etc.

Mofiu - Secure connectivity, uncompromised performance.