1 user
$69
per user. Launch price until 31 December 2026, then $69.
per user
- One license per person, for use on all that person's computers
- Perpetual license, delivered as a license key by email
- Updates: as stated on your purchase receipt
Modbus master and slave test tool for Windows
Test, poll and diagnose Modbus devices on one screen.
Busscope speaks Modbus TCP, Modbus/TCP Security (TLS), RTU and ASCII, with poll windows, live charts, diagnostics, a request runner and a register probe.
Current version 0.1.0. No license key needed to evaluate.
- 4transports: TCP, TLS, RTU, ASCII
- 12display formats in 4 byte orders
- ∞poll windows on one connection
- Livecharts, traffic view and logging
Features
What the Modbus tester does
Register poller windows
Open any number of poll windows that share one connection. Add value labels such as 1=Running and name cells, including pasting names from Excel.
- One connection, as many windows as you need
- Names appear in charts, log headers and print
- Per-cell colors, fonts and conditional rules
Live charts
Each poll window has its own live chart. Cell names appear in charts, log headers and print.
- One chart per poll window, fed by the live values
- Log the same values to CSV or Excel (.xlsx)
- Print preview of any window
Diagnostics and Request Runner
Functions 07, 08 (all sub-functions), 11, 17 and 43/14 in a dedicated diagnostics window. The Request Runner sends scripted requests and checks the answer against what you expect.
- Expectations: OK, EX n, TIMEOUT, RESP hex
- Save and load request lists as JSON
- Read the frames on the wire in the traffic view
And the details that save time
Display formats
12 display formats with 4 byte and word orders, set per cell, per selection or for a whole window.
Cell names and value labels
Name any cell, paste names from Excel, and turn raw values into words such as 1=Running.
Cell colors and fonts
Fixed colors per address plus two conditional rules (= > < >= <= and) evaluated on the live value. Fonts per address. All saved in the workspace.
Write dialog
Functions 05, 06, 15, 16, 22 and 23 from the write dialog, with a confirmation before anything is sent. Writing to equipment is your responsibility, as the EULA spells out.
Register Probe
Finds readable and illegal address ranges on a device.
Logging, print, workspaces
Log to CSV or Excel (.xlsx), print preview of any window, and save everything (connection, windows, formats, names, charts, auto-connect) as a .bsw workspace.
Supported protocols: Modbus TCP, Modbus RTU and TLS
Modbus/TCP Security uses TLS 1.2 or newer with mutual authentication and the ALPN identifier mbap-tls. For serial lines, Busscope offers RS-485 echo removal and RTS toggle.
Function codes: 01-06, 15, 16, 22, 23 (read and write), and 07, 08, 11, 17, 43/14 (diagnostics).
Guides: Modbus TCP, RTU, TLS and register polling
Modbus TCP tester
Connect to a device, poll coils and registers, write with confirmation and read the frames on the wire.
Modbus RTU tester
Serial settings, RS-485 echo removal and RTS toggle for Modbus RTU and ASCII devices.
Modbus register poller
Several poll windows on one connection, with formats, names, colors, live charts and logging.
Modbus/TCP Security (TLS)
Connect to secured devices with TLS 1.2 or newer, client certificates and a CA file.
Pricing
One perpetual license, with volume prices for teams. Each license is delivered as a license key by email. Details and how licensing works.
2-5 users
$59
per user. Launch price until 31 December 2026, then $59.
per user
- For teams: one key, one invoice
- Same perpetual license as the single license
- Updates: as stated on your purchase receipt
6 or more users
$50
per user. Launch price until 31 December 2026, then $50.
per user
- For teams: one key, one invoice
- Same perpetual license as the single license
- Updates: as stated on your purchase receipt
License sales open soon. You can already download the evaluation; questions about licenses: support@busscope.com.
Evaluate it first
Install Busscope and run it without a key. In evaluation mode features or the evaluation period may be limited. It is meant for trying the tool, not for production or commercial use.
Frequently asked questions
Can I try Busscope before buying?
Yes. Without a license key Busscope runs in evaluation mode. Features or the evaluation period may be limited. Evaluation use for production or commercial purposes is not permitted. See the download page.
How do I receive my license key?
After purchase the license key is sent to the email address you gave at checkout. See Pricing for details.
Can Busscope write to my devices?
Yes. Busscope has a write dialog for functions 01-06, 15, 16, 22 and 23. Writing to industrial equipment can have physical consequences. You are responsible for checking that every write is safe, and Busscope must not be the only safeguard in safety-critical systems (EULA section 8).
Does Busscope send my data anywhere?
Busscope does not send your device data, polled values or project files to the licensor (EULA section 7). The site itself uses no analytics or tracking. See the privacy policy.
Is Busscope affiliated with other Modbus tools?
No. Busscope is independent software written from the public Modbus specification. It is not affiliated with, endorsed by or derived from any other Modbus product. "Modbus" is a trademark of its respective owner.
What about the third-party libraries inside Busscope?
Busscope includes third-party components under their own licenses. The Qt libraries are shipped as separate DLL files and may be replaced as the GNU LGPL v3 allows. The list is on the EULA page.