modbus-studio
An open-source Modbus master that runs in your browser. It polls Modbus TCP, RTU and RTU-over-TCP devices, decodes their registers into engineering values, writes coils and registers, and shows every frame on the wire. Run it on your laptop, or on a gateway or Raspberry Pi on the plant network and open it from any browser.
Install and run
pipx install modbus-studio # or: pip install modbus-studio
modbus-studio # open http://127.0.0.1:8000
The package includes the web UI; no Node.js is needed. A slave simulator comes with it, to try everything without hardware:
modbus-studio-sim # Modbus TCP on :5020, RTU over TCP on :5021
Then, in the UI, + Connection → Modbus TCP, 127.0.0.1, port 5020, and
+ Window. Serial ports (RTU) are listed in the connection dialog.
What it does
- Modbus TCP, RTU over TCP and RTU on a serial port; FC01–FC04 reads, FC05/06/15/16 writes.
- 16, 32 and 64-bit integers and floats in the four byte orders, scale and unit per register, aliases, CSV register maps.
- Several polling windows with their own scan rates, a traffic monitor with the raw frames, a real-time chart, writes with a confirmation dialog and a write log.
- Export to InfluxDB 2.x and publishing over MQTT, configured from the UI.
- REST API and WebSocket (OpenAPI at
/docs), JSON workspaces saved automatically.
On a network
The server listens on 127.0.0.1 only. To open it to other machines, set a token:
MODBUS_STUDIO_HOST=0.0.0.0 MODBUS_STUDIO_TOKEN="$(openssl rand -hex 24)" modbus-studio
Anyone who can reach the API can write to your devices: do not expose it without a
token, and preferably keep it behind a VPN or a reverse proxy with TLS.
modbus-studio --help lists the settings.
More
Documentation, the Docker image (ghcr.io/electrolabopen/modbus-studio, amd64 and
arm64), the changelog and the issue tracker: https://github.com/electrolabopen/modbus-studio
(español).
MIT licensed. modbus-studio is an independent project, not affiliated with, endorsed by or sponsored by Witte Software. "Modbus" is a trademark of Schneider Electric USA, Inc.
1 maintainer
Metadata
1 maintainer
Release files for modbus-studio 0.1.0
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