Shelly PRO Modbus Add-on RS485

An RS485 communication add-on for Shelly PRO devices designed for integration with building and energy management systems. Direct attachment enables data exchange with external controllers and platforms. This is an expansion add-on and not a standalone device. It requires a compatible Shelly PRO device to operate Shelly PRO EM-50 Shelly PRO 3EM 120 A Shelly PRO 3EM-400 Shelly PRO 1 or Shelly PRO 2.

Key Features

• Standard Modbus integration with BMS EMS SCADA and PLC systems
• Direct plug-in to compatible Shelly PRO devices via expansion port
• RS485 wired communication for stable long-distance connectivity and multi-device networks up to 32 nodes
• Modbus Client mode for reading data from meters inverters HVAC and external controllers without custom gateways
• Modbus Server mode for sharing device data and status with BMS EMS SCADA and monitoring platforms
• Half-duplex operation for reliable data exchange at speeds up to 10 Mbps over distances of up to 50 m outdoors depending on local conditions
• Low power consumption under 1 W powered via 3.3V or 12V from the host device
• Wide environmental range operating from -20°C to 40°C with 30 – 70 humidity up to 2000 m altitude
• App-based configuration via Shelly Smart Control for quick setup and management
• Hybrid wired and wireless ecosystem combining RS485 infrastructure with Shelly cloud and APIs
• DIN-rail-ready design for secure installation inside electrical panels

Use cases

• Energy Monitoring
  With the Pro Modbus Add-on RS485, Shelly Pro EM devices become suitable for professional energy monitoring systems in commercial, commercial-residential, and multi-tenant buildings. The Add-on allows energy data to be delivered directly to BMS, EMS, SCADA dashboards through RS485 – a widely adopted professional communication standard.
• Building Automation System (BMS)
  The Pro Modbus Add-on RS485 enables Shelly Pro devices to integrate directly into Building Management Systems (BMS) used in commercial buildings, hotels, offices, and large residential installations. Through RS485, BMS controllers can reliably communicate with Shelly device to monitor electrical loads and operate building equipment.
• Professional Automation and Equipment Control
  The Pro Modbus Add-on RS485 allows Shelly Pro devices to participate in professional automation environments by communicating with PLC’s, motor controllers, and gateways over RS485. This expands Shelly’s capabilities to factories, workshops, and production-related facilities, while maintaining a flexible and compact automation approach.
• Renewable Energy Integration
  The Pro Modbus Add-on RS485 enables Shelly Pro devices to be seamlessly integrated into renewable energy systems such as solar PV installation, battery storage solution, microgrids, and hybrid energy setups. With RS485 connectivity, Shelly devices can communicate directly with solar inverters, charge controllers, and energy gateways that rely on robust wired communication.
• HVAC Integration

  The Pro Modbus Add-on RS485 enables Shelly Pro devices to integrate seamlessly HVAC systems that can use RS485 communication. Using the add-on, Shelly Pro devices can monitor HVAC operational data, control auxiliary equipment, and connect HVAC installations to building automation platforms through a reliable, long-distance wired interface.

Main applications

• Professional Automation and System integration (PLC Integration, process control, factory monitoring, etc.)
• BMS – Building Automation (HVAC Systems, Lightning control, etc.)
• EMS – Energy Management System (consumption tracking, billing and cost allocation, etc.)
• Renewable Energy and Smart grid (solar monitoring, battery storage, etc.)
• Professional Residential and Commercial automation (smart homes, mixed-use buildings, commercial spaces, etc.)