RSpell

What it enables

RSpell is a small Linux box built for reliable serial/ethernet bridging and edge automation.

Linux OS

We ship a lean, maintained Linux system tuned for reliability, easy field updates, and Buildroot support.

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Edge automation

Run your own services on-device: polling, data shaping, alerts, or protocol translation.

Capabilities →

Affordable & scalable

Cost-effective hardware for deployments where you need multiple serial ports and Linux control.

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Prebuilt features

Ready-to-use features in prebuild system images tuned for specific gateway use cases.

Modbus Gateway

A ready Modbus RTU → Modbus TCP gateway for fast deployment to production systems.

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Serial Gateway

Converts raw serial data into a Websocket API for easy integration to Web based applications.

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MQTT Gateway

Converts serial data into MQTT messages for easy integration with IoT platforms.

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Webserver

Upload your own app, use some backend (builtin or own), and serve static content via Nginx.

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RSpell SDK lets you build a custom OS with Buildroot. If you need help with your image, contact us.

Linux inside, built for integration

RSpell ships with a curated Linux image optimized for embedded reliability, remote access, and long uptimes.

You get a familiar Linux environment to deploy your own services while keeping system updates simple and safe.

Serial I/O that scales

Four independent RS485 lines, switchable to two RS422 lines. Configure baud rate, parity, and bus settings per line.

Gateway-ready networking

Ethernet is standard; Wi-Fi is available depending on the Milk-V Duo variant. Plug it into existing networks or deploy it where wiring is limited.

Build your own services

Linux lets you implement any network layer you need — from a simple REST API to a full web application with dashboards and device management.

Open integration

Deploy your own services and integrate with existing monitoring or control systems.

Designed for field use

Stable OS updates and low power draw make RSpell fit for distributed installations.

Cost-effective

A practical alternative to industrial PCs when you need many serial ports and Linux control.

RGB status LEDs

Four RGB notification LEDs can be controlled from the system to show service status or any custom state.

Hardware highlights

CPU: 1-core 1 GHz RISC-V
RAM: 1 GB
SoC: Milk-V Duo
Networking: Ethernet + optional Wi-Fi
Serial: 4x RS485 (switchable to 2x RS422)
Storage: eMMC 8 GB (optional)
OS: Custom Linux (Buildroot)

Need details for your deployment? We can tailor firmware and configuration guidance.

Serial interfaces that matter

Choose RS485 for multi-drop buses or switch to RS422 when a differential pair is required.

4x RS485 lines

Connect multiple Modbus RTU devices on separate buses.

2x RS422 mode

Switch two pairs for longer runs or point-to-point links.

Gateway at the edge

Bridge serial to Ethernet or Wi-Fi without a bulky industrial PC.

PoE—

Wi-Fi—

eMMC8 GB

Basic model without additional features.

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Planned

RSpell 4422 PoE

PoE✓

Wi-Fi—

eMMC8 GB

Can be powered via PoE. Ideal for quick installation without excess cabling.

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Planned

RSpell 4422 Wi-Fi

PoE—

Wi-Fi✓

eMMC8 GB

Can be connect via Wi-Fi. Ideal for installation in already built-up spaces.

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Planned

RSpell 4422 Full

PoE✓

Wi-Fi✓

eMMC8 GB

All additional features available for the most flexible deployment.

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Where to buy

Reach out to our distribution partners for pricing and availability.

Supplier #1

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Supplier #2

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Supplier #3

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