Raw serial, Modbus RTU/TCP master & slave — one app, one timeline. Select any broken frame and the AI tells you what it is, why it failed, and what to check next.
Valid FC03 response, but checksum 3B 91 ≠ computed 3A 91 — single-bit error, likely corruption on the wire.
Screenshot the register map from any device manual. The AI extracts addresses, types, byte order, scaling and units into a point map.
You confirm the address base and any flagged rows — nothing imports silently. One click builds segmented poll tasks and starts reading real values.
CRC fail, exception code, garbage bytes, timeouts — select the frame and get ranked causes plus a checklist, right where the error happened.
Raw serial and parsed Modbus share one spine: microsecond timestamps, response latency (Δ) per exchange, byte-level field coloring, filter and export.
The first protocol tool that reads hex back to you: what the frame is, which byte is wrong, the most likely cause, and what to check next.
Manual screenshot → typed, scaled, named register grid. Address-base confirmation and conflict checks make it safe, a device profile makes it reusable.
Poll real devices and simulate them — with sine/increment value generators — in the same window. Loop them back to test your own software with no hardware.
Clip passively onto a live 485 bus. Fieldbench splits the stream, runs CRC heuristics and offers one-click Modbus decoding of the entire history.
Activate once — online or fully offline — and it never phones home. Portable .zip for locked-down factory PCs. Only the optional AI needs a network.
The tool is a one-time purchase. AI is an optional add-on — it burns metered API capacity, so it's the only thing that subscribes.
Yes — every core feature works with zero network. Activation has a fully offline path (machine code → activation file), and once activated the app never phones home. Only the optional AI assistant needs a connection; when you're offline its button simply grays out.
No. Fieldbench Pro is a one-time purchase you own forever, including all 1.x updates. The AI assistant is the only subscription, because every explanation consumes metered API capacity — and the app is fully usable without it.
Modbus Poll and Modbus Slave are two separate $129 purchases with an interface from another era. Fieldbench puts master, slave and raw serial in one timeline, can passively monitor a live bus, auto-detects Modbus, explains broken frames with AI, and imports register maps from manual screenshots.
It shouldn't — installers and the portable build are code-signed. If SmartScreen still shows a prompt on a fresh release, "More info → Run anyway" is safe; the signature details will show Fieldbench as publisher.
Yes. Checkout is handled by Paddle as merchant of record — you get a proper invoice with VAT/sales tax handled for your country. Most engineers simply expense it.
30 days, no questions asked. If Fieldbench doesn't save you time, you shouldn't pay for it.
Free forever for single-connection work. Sixty seconds to first frame.
Download for Windows