Poll
Test and monitor Modbus TCP or RTU devices with practical tools for register-level debugging.
- Read and write registers
- Configure data formats, units, and scaling
- Inspect communication activity
A practical toolkit for engineers
Roach Modbus Tool. From testing to automation.
Test Modbus TCP and RTU devices, simulate slave devices, and automate repeatable test workflows, all in one lightweight Windows application.
One-time payment · No subscription · Windows 10/11 x64 · 30-day trial
Features
Three modes. One focused workflow.
Move from checking registers to simulating devices and running repeatable tests without juggling separate tools.
Slave
Simulate a local Modbus slave to test master-side behavior before target hardware is available.
- Create a local register map
- Validate master and gateway workflows
- Prepare tests before hardware arrives
Script
Automate repeatable read/write cases to reduce repetitive manual testing and make results easier to review.
- Build reusable test sequences
- Use loops and flow control (A/B channels)
- Export results for review (Excel)
Made for real work
Spend less time repeating steps. More time solving problems.
Roach Modbus Tool brings common communication and validation tasks into a single desktop workflow, useful during firmware development, device integration, and lab testing.
Debug at register level
Inspect values and communication behavior while bringing up a device.
Test before hardware is ready
Use slave simulation to prepare and validate parts of your integration workflow.
Repeat and document tests
Turn routine read/write checks into repeatable cases and export results when needed.
Straightforward pricing
One payment. No subscription.
Get the core Roach Modbus Tool workflow with a single-seat license and no recurring subscription fee.
30-day trial
$0
full features
- Evaluate Poll, Slave, and Script
- TCP + RTU
- No credit card to start
One complete toolkit
The essential modes for everyday Modbus engineering tasks.
- Poll mode
- Slave simulation mode
- Script automation mode
- Windows x64 portable package
Roach Modbus Tool
$79
USD · one-time payment
One-time payment. No recurring subscription.
- Unlock Poll, Slave, and Script
- Perpetual use within the purchased license scope
- No monthly or annual fee
- Early unsigned builds: list price may rise later; buyers keep $79
License scope, supported versions, updates, and commercial-use terms should be reviewed before purchase.
Questions before buying
Clear answers. No surprises.
Which platforms are supported?
The current package is intended for Windows 10 and Windows 11 on x64 systems.
Is this a subscription?
No. The listed price is a one-time $79 payment.
Will Windows show a security warning?
If a release is not yet signed or has not built enough reputation, Windows may label it as from an unknown publisher. Please download only from the official release page, then follow these steps: 1. Click "More info". 2. Click "Keep anyway" (browser download) or "Run anyway" (Windows SmartScreen). If you still can't install it, please email the developer. Once the app is code-signed, the price may increase.
Will my $79 license stay valid if the price goes up?
Yes. Existing purchasers keep their $79 rights.
Can I use it for commercial engineering work?
Commercial use depends on the license terms provided with your purchase.
How do I get support?
Use the Feedback page to report a bug or request a feature. Include the software version, Windows version, and steps to reproduce. License questions can use Contact / license in the footer.
Download Roach Modbus Tool
Portable Windows x64 zip — unzip and run RoachModbusTool.exe.
If SmartScreen appears, use More info, then Run anyway.
Make your next Modbus test more repeatable.
One toolkit for polling, simulation, and scripted verification.