Link485 Air
Wi-Fi Modbus Gateway
Link485 Air bridges your RS-485 Modbus devices to Wi-Fi networks, enabling cloud integration, mobile apps, and modern IoT platforms. Convert Modbus RTU to Modbus TCP, MQTT, or HTTP/REST APIs with an easy-to-use web configuration interface.
Key Features
1x Modbus RTU Interface
Connect legacy Modbus RTU devices (RS-485) to Ethernet networks and enable remote access via Modbus TCP protocol.
2x 5A Relay Outputs
Control equipment directly with two built-in 5A relays for automated control based on Modbus data or schedules.
Wi-Fi Connectivity
2.4 GHz 802.11 b/g/n Wi-Fi radio for wireless connection to existing networks. Supports MQTT, HTTP REST API, and Modbus TCP.
Bluetooth Low Energy (BLE)
Built-in BLE radio for local configuration, diagnostics, and mobile app connectivity without network access.
Technical Specifications
Modbus Interface
| Ports | 1x Modbus RTU (RS-485) |
| Baud Rate | 1200 - 115200 bps |
| Termination | 120Ω switchable |
Relays & I/O
| Relay Outputs | 2x 5A (NO/NC) |
| Rating | 250V AC / 30V DC |
| Control | Modbus, schedule, cloud |
Wireless
| WiFi | 1x 802.11 b/g/n 2.4GHz |
| BLE | 1x Bluetooth Low Energy |
| Security | WPA2-PSK, WPA3 |
Protocols
| Modbus TCP | Client/Server |
| MQTT | v3.1.1, TLS 1.2 |
| HTTP/HTTPS | REST API |
Power & Physical
| Input Voltage | 12-24V DC |
| Operating Temp | -20°C to +70°C |
| Mounting | DIN rail 35mm |
Perfect For
Building Automation
Connect HVAC, lighting, and energy meters to Wi-Fi for centralized monitoring and control.
Data Logging
Stream sensor data to cloud databases, time-series platforms, or analytics systems.
Factory Monitoring
Connect production machines to MES/SCADA systems via Wi-Fi without additional wiring.
Energy Management
Monitor power meters and integrate with energy management systems via MQTT or REST API.
Frequently Asked Questions
Yes! Link485 Air supports WPA2-Enterprise authentication (802.1X) for corporate WiFi networks with RADIUS servers. It also works with guest networks and can handle captive portals in most cases.
Link485 Air uses WPA2/WPA3 encryption for WiFi. All cloud communication uses TLS/SSL encryption. The web configuration interface supports HTTPS. You can also configure VPN tunneling for additional security.
Link485 Air automatically reconnects when WiFi becomes available. It buffers Modbus data locally during disconnections (up to 1000 transactions). You'll receive alerts via SMS/email if the connection stays down for more than configured threshold (default 5 minutes).
Yes! Link485 Air works perfectly on local WiFi networks without internet. You can use Modbus TCP mode to communicate with local SCADA/BMS systems. Internet is only required if you want to use Link485 Cloud features or send data to external services.
Link485 Air supports up to 32 Modbus slave devices on the RS-485 bus. Polling rate depends on your requirements - typical installations poll 10-20 devices every 1-5 seconds without issues.
