About Us

Building reliable tools for industrial communication.

ModbusSim is a software product built for engineers, developers, and technicians who work with Modbus protocol in industrial automation, SCADA systems, building management, and IoT applications.

Our Mission

We build professional-grade testing tools that simplify Modbus development and debugging. Our goal is to provide an affordable, easy-to-use desktop application that covers both sides of the Modbus protocol — master polling and slave simulation — in a single tool.

What We Offer

Modbus Poll Simulator is our flagship product. It is a Windows desktop application that enables:

• Master Mode — Poll and control Modbus TCP and RTU slave devices with configurable function codes, intervals, and data display formats.
• Slave Mode — Simulate a Modbus slave device with configurable registers, coils, and inputs for testing master applications.
• Real-time Monitoring — Live data charts, interactive data grids, and full communication logging for debugging protocol issues.

Why Choose Us

• One-time purchase — No subscriptions or recurring fees.
• Free updates — All future updates included with your license.
• 15-day free trial — Try before you buy, no credit card required.
• Email support — Responsive technical support via email.

Contact

For inquiries, support, or feedback, reach us at [email protected].

Visit our Contact page for more ways to get in touch.