v1.2.7 — Latest Release

Download Modbus Simulator Free

Professional Modbus RTU + TCP + ASCII simulator for Windows engineers. Master & Slave modes. No hardware required. 30-day free trial.

🐧 Download for Linux (64-bit .zip)

✅ Windows 10/11 (64-bit) ✅ Linux 64-bit (.zip) ✅ Includes SCADA Desktop bonus ✅ 30-day free trial ✅ Email verification required

What's Included in v1.2.7

Released July 2026 — All features in the free trial

🔌 Modbus RTU Simulator

Serial port simulation for RTU devices. Configure baud rate, parity, stop bits. Test over virtual COM ports.

🌐 Modbus TCP Simulator

Full TCP/IP master and slave simulation. Port 502 or custom. Connect from any Modbus TCP client.

👑 Master + Slave Modes

Both modes in one application. No separate purchase. Switch between master and slave instantly.

📊 Real-Time Register View

Live coil, discrete input, input register, and holding register monitoring. Multiple display formats.

🐛 Diagnostic Mode

New in v1.1.1 — detailed request/response logging, error simulation, slave-mode log view.

📁 Slave Mode Log

New in v1.1.1 — scrollable request history in slave mode so you can see what master is sending.

How to Install

Download the ZIP bundle — click the green button above. Includes Modbus Simulator + SCADA Desktop. Free account required (for license tracking and updates).

Extract the ZIP — right-click → Extract All.

Run ModbusSimulator-Setup.exe (or SCADA-Setup.exe) — double-click and follow the installer. Windows may show SmartScreen warning — click "More info → Run anyway" (safe, unsigned freeware).

Start your trial — 30-day free trial starts automatically on first launch. Buy license for unlimited use ($59 one-time).

Download FAQ

Is Modbus Simulator really free?

Yes — 30 days free, no registration, no credit card. After the trial, a $59 one-time license unlocks unlimited use. No subscriptions.

Does it work on Windows 10 and Windows 11?

Yes, fully compatible with Windows 10 and Windows 11 (64-bit). Requires .NET 6 runtime (included in the download).

Can I use virtual COM ports for Modbus RTU?

Yes. We recommend com0com (free) to create virtual COM port pairs for RTU testing without physical hardware.

What is the difference between Modbus RTU and Modbus TCP simulator?

RTU uses serial communication (COM ports, RS-485). TCP uses Ethernet/IP on port 502. Our simulator supports both. See comparison guide →

How is ModbusSimulator different from Modbus Poll?

Modbus Poll is master-only ($149+/year). ModbusSimulator includes both master and slave modes for $59 one-time. See full comparison → or read our Modbus Poll license price breakdown.

Ready to Test Modbus Without Hardware?

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One click downloads both installers in parallel — Modbus Simulator + SCADA Desktop bonus.