HG1v4 Intelligent HART Gateway — DIN-rail HART to Modbus gateway

The Intelligent HART Gateway

HART data anywhere — free secure remote access, full browser setup and commissioning, open JSON data. A secure, UK-designed, drop-in upgrade for the HG1 and HG1+.

Shop the HG1v4

From the panel to the cloud

  • Free remote access

    Reach the gateway from anywhere over a secure, outbound TLS tunnel — no VPN, no fixed IP, no subscription and no per-device fees. Opt-in per device.

  • No software — just a browser

    Configure, commission, monitor and diagnose HART devices from any browser. Basic commissioning built in; full config via PACTware over the virtual COM port.

  • Open data, cloud-ready

    Read HART data as JSON over a simple web request, local or remote, or publish it to any MQTT broker, including AWS IoT Core and Azure IoT Hub, as it changes.

  • Secure by design

    Signed A/B firmware updates with automatic rollback; designed to meet the EU Cyber Resilience Act and IEC 62443.

See it live

A HART transmitter in our workshop, read by an HG1v4 and published over MQTT. The readings update as you watch, in an ordinary browser with nothing installed.

View the live demo

Made in Britain

Designed and built in the UK by Lawnswood Technology, incorporating RAP Systems. Signed, automatic firmware updates with A/B rollback keep every gateway current and safe — a failed update can't brick it. Designed to meet the EU Cyber Resilience Act and IEC 62443.

RAP Systems HM1-UD USB HART modem with USB-A plug

The USB HART Modem

Connect your PC to HART instruments for configuration and diagnostics with PACTware, FieldCare and SIMATIC PDM. A simple USB HART modem for the bench or the field.

Shop the modem