RLX-NX — SCADA backend service Everything else connects to Nexus.
Nexus is the tag engine, historian, device drivers, alarms and reporting, plus the web server that serves Spectrum, the configuration console and the manual. Installed once per site, on a plant server or on the panel itself.
Specifications
Version 2026.21. Describes Nexus as built.
| Interfaces | Value |
|---|---|
| Allen-Bradley | EtherNet/IP — ControlLogix, CompactLogix 5370+ |
| Siemens | S7 — S7-300, S7-400, S7-1200, S7-1500 |
| Modbus | TCP, and RTU over serial |
| AutomationDirect | CLICK and CLICK PLUS — TCP and RTU |
| Omron | FINS — TCP and UDP |
| DNP3 | Outstation polling, with sequence-of-events timestamps |
| BACnet/IP | Building plant and HVAC |
| OPC UA | Client and server — connect out, or be connected to |
| Web / API | 8080 HTTP, 8443 HTTPS |
| Report delivery | SMTP, FTP, SFTP |
| Deployment | Value |
|---|---|
| Windows | Server 2019+ or 10/11, 64-bit — packaged installer |
| Linux | .deb for Debian/Ubuntu, .rpm for Fedora/RHEL — x86-64. ARM64 on request |
| Runs as | Windows service, or a systemd unit |
| Historian | Licensed module — no separate database server to deploy |
| Scripting | Sandboxed — no filesystem or network by default |
Not sure about a particular controller? Check your PLC by family, model or part number.
How it works
Talks to your plant
Drivers are built in. There is no separate OPC server to license, install and keep running alongside Nexus.
Each device carries its own poll rate, and the diagnostics for a connection sit on the device itself rather than in a log you have to go and find.
Keeps the data
The historian is part of Nexus. Tag history, alarm history and the audit trail are recorded without standing up a database server.
When a device link drops, writes are buffered and forwarded when it recovers, so a network blip does not become a hole in the record.
Serves everything else
The same service that polls your devices serves the operator runtime, the configuration console, the REST API and the WebSocket feed.
The manual ships with Nexus and is served from it, so the documentation always matches the version you are running.
Reports out
Rendered reports go out over SMTP, or land on an FTP or SFTP target on a schedule. Reporting is a licensed add-on; everything else on this page is in the base gateway.
The console
Next step
Put it on a real PLC this afternoon.
Everything is free to download and free to try. Start the trial and Raylux is completely unlocked for two hours — every driver, every module, unlimited tags and clients, nothing withheld. When the two hours are up you restart it, as often as you like.