Connect any modbus rtu devices to a wifi network

WiFi Modbus RS485 Bridge with 5A Relay — Connect Any Modbus Device to WiFi

The MOFI5A is a WiFi-to-Modbus RS485 bridge with a built-in 5A relay. It connects any Modbus RTU device — energy meter, flow meter, sensor, VFD, or PLC — to your WiFi network, pushing data to a cloud dashboard and accepting relay commands remotely. No new wiring. No cellular SIM. Just your existing WiFi.

How It Works

Wire the MOFI5A to your Modbus RS485 device. It connects to WiFi and begins polling the configured Modbus registers automatically. Data is pushed to your cloud platform at set intervals. The 5A relay can be controlled remotely — to switch a pump, valve, alarm, or auxiliary load based on sensor thresholds or manual commands from the dashboard.

The Built-in 5A Relay

Most Modbus bridges are read-only. The MOFI5A adds actuation — the 5A relay lets you respond to what you're reading. Trip a valve when a level sensor crosses a threshold. Switch a pump based on a tank level reading. Trigger an alarm when energy consumption exceeds a limit.

Use Cases

• Energy monitoring — bring Modbus energy meters online without running Ethernet or RS485 cable to a controller
• Water and tank management — read level sensors and control fill pumps from the same device
• Building automation — connect Modbus HVAC units, meters, and sensors to a WiFi-based BMS
• Industrial IoT — add cloud connectivity to any RS485 device on the factory floor
• Outdoor installations — the MOFI5A65 variant is rated for outdoor enclosure use

Key Specifications

• Device side: Modbus RTU RS485
• Network side: WiFi (2.4 GHz)
• Relay: 5A — controllable from dashboard or rule-based automation
• Polling: Automatic, configurable Modbus register polling
• Compatible with: Any standard Modbus RTU RS485 device