Heltec HRI-485X
Industrial RS-485 wireless converter with ESP32, LoRa SX1262, Ethernet, and ESPHome support. Converts RS-485/Modbus serial data to LoRa, LoRaWAN, LTE, or Ethernet for long-range industrial IoT communication. DIN rail mountable with IP65 protection and 4.5-28V wide voltage input.
$17.90
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Specifications
Components
Xtensa LX6 dual-core processor at 240MHz with 520KB SRAM, 4MB flash, WiFi 802.11 b/g/n and Bluetooth 4.2/BLE. Provides the main processing, Ethernet MAC, and wireless connectivity for the converter.
Semtech SX1262 long-range, low-power sub-GHz RF transceiver supporting LoRa and FSK modulation in the 150-960MHz ISM bands. Provides +22dBm TX power with -134dBm receiving sensitivity for multi-kilometer range.
Realtek RTL8201 single-chip 10/100Mbps Fast Ethernet PHYceiver connected via RMII interface, providing wired LAN connectivity for local configuration and data forwarding.
Maxim MAX3485 half-duplex RS-485/RS-422 transceiver operating at 3.3V with up to 10Mbps data rate. Power-controlled via GPIO16 for energy-efficient RS-485 bus communication.
Bus Interfaces
GPIO Map
Overview
The Heltec HRI-485X is an industrial-grade RS-485 wireless converter designed for bridging legacy serial devices to modern IoT networks. Built around the ESP32 MCU with an SX1262 LoRa transceiver and RTL8201 Ethernet PHY, it converts RS-485/Modbus RTU data to LoRa, LoRaWAN, LTE, or Ethernet — enabling remote monitoring and control of industrial equipment without running new cables.
The device accepts 4.5-28V DC wide-range input, features IP65 environmental protection, and mounts on standard 35mm DIN rails for clean panel installations. A MAX3485 transceiver handles the RS-485 bus interface, while a built-in web configuration page (accessible via LAN at 192.168.4.1) makes setup straightforward. Multiple networking modes are supported including point-to-point, point-to-multipoint, mesh relay, and gateway configurations.
Thanks to its ESP32 core, the HRI-485X can be flashed with ESPHome firmware — turning it into a native Home Assistant Modbus gateway. The ESPHome Devices database includes a ready-made configuration with Modbus sensor examples, making it easy to integrate RS-485 devices like energy meters, HVAC controllers, and industrial sensors into a smart home or building management system. Data encryption and communication keys provide security for sensitive deployments.
Use Cases
6Modbus IoT Gateway
Bridge Modbus RS-485 industrial devices to WiFi, Ethernet, or cellular networks for cloud monitoring.
Industrial RS-485 Communication
Implement robust RS-485 serial communication for industrial sensors, PLCs, and automation systems.
RS-485 to LoRa Bridge
Converts RS-485 serial data to LoRa wireless for long-range industrial telemetry without wired infrastructure.
RS-485 to WiFi Bridge
Bridges RS-485 serial bus devices to WiFi networks, enabling wireless monitoring and control of industrial equipment.
Building Management
Monitoring and controlling building systems like HVAC, lighting, and energy meters via Modbus/RS-485.
LoRa Mesh Networking
Building off-grid mesh communication networks using LoRa radio for text messaging, location sharing, and sensor data relay without cellular or internet infrastructure.
Resources
Where to Buy
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