Because the key is machine-bound, moving to a new PC invalidates your old key.
One of the most underrated new features: Export to Excel with timestamps. Right-click any register window and select Copy Table with Date. This captures the exact millisecond of the poll, crucial for legal compliance or production analysis.
| Feature | Available From | |---------|----------------| | Dark Mode / Dockable UI | v9.4+ | | Trend Plotting | v9.5+ | | JavaScript Scripting | v10.0+ | | Modbus/TCP Security (TLS) | v10.2+ | | Command-line control | v9.8+ | | Error Injection / Packet Replay | v10.1+ |
Who should upgrade?
A common pain point was connecting to serial devices over network terminal servers. The new Modbus Poll includes native support for RFC 2217, meaning you can poll a serial device across the internet without third-party virtual COM port drivers.
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To register or activate Modbus Poll with a new license key, the process is integrated directly into the connection workflow. How to Activate Your License Key
The registration prompt appears automatically when you attempt to connect to a device.
Open Modbus Poll and press F3 (or navigate to Connection > Connect).
A dialog box will appear prompting you to enter your license key. Once the valid key is entered, the software is activated. Important License Details (2026) modbus poll key new
Perpetual Licenses: Modbus Poll licenses are perpetual, meaning there are no yearly renewal fees or hidden costs.
Version Compatibility: License keys issued in 2019 or newer are compatible with the latest versions of the software.
Demo Mode: Without a key, the software runs in a demo mode which is limited to 10 minutes of communication (or a 30-day evaluation period depending on the specific build) before requiring a restart.
Transferring Licenses: To move your key to a new computer, you must first uninstall it from the old machine before installing and activating it on the new one. Quick Setup & Essential Keys Keyboard Shortcut Connect / Register F3 Connection > Connect Read/Write Definition F8 Setup > Read/Write Definition Open Help Manual F1 Help > Contents New Window Ctrl + N File > New Official Resources
Software Downloads: Get the latest 32-bit, 64-bit, or ARM64 versions directly from the Modbus Tools Download Page.
Pricing & Orders: Official license pricing (ranging from ~$129 for single licenses to discounted bulk rates) is available on the Witte Software Ordering Page. Modbus Poll User Manual
To register a new license for Modbus Poll, you enter your key when establishing a connection (shortcut F3) or when the software prompts you upon startup after the evaluation period expires. Licensing Overview
Modbus Poll is commercial software with a 30-day evaluation period. During this trial, the application limits communication sessions to 10 minutes, after which you must restart the program. Registration Process: Open Modbus Poll and go to the Connection menu. Select Connect or press the F3 key. A dialog box will appear asking for your License Key.
Enter the key exactly as provided by Witte Software to unlock perpetual use. Because the key is machine-bound, moving to a
Perpetual Licenses: Once purchased, your license is valid forever for that major version. Keys from 2019 or newer are compatible with current versions.
Usage Rights: A single-user license allows you to use the software on multiple computers as long as you are the only one using it. Quick Start Guide for New Users
Once registered, follow these steps to begin polling data from a slave device:
Establish Connection (F3): Define your protocol (Modbus RTU, TCP/IP, etc.) and physical port settings.
Define Read/Write (F8): Set the Slave ID, Function Code (e.g., 03 Read Holding Registers), and the starting Address.
Addressing Note: Modbus Poll uses base 0 (protocol) addressing by default. If your device manual starts at 40001, enter "0" in Modbus Poll.
Monitor Data: Data will appear in the grid. Double-click any cell to write a new value to the register. Common Troubleshooting
Timeout Errors: Ensure the correct COM port or IP address is selected. Use ping to verify network connectivity for TCP devices.
Invalid Data Address: If you receive an "illegal data address" error, you may be requesting a register that does not exist on the slave device. Try decrementing your address by 1 if switching from base 1 to base 0. One of the most underrated new features: Export
For further assistance, you can access context-sensitive help by pressing F1 anywhere in the software. Modbus Poll User Manual
Modbus Poll is a popular Modbus master simulator used for testing and debugging slave devices by simulating a master station. It allows engineers to monitor and log data from sensors and PLCs in real-time. 🔑 Registration and Licensing
To use the full version of Modbus Poll, a registration key is required from the developer, Witte Software.
Official Purchase: A single-user license typically costs $129.00 USD for 1 to 2 licenses.
Trial Version: A free trial is available but usually has a time limit (e.g., 10 minutes per session).
Unauthorized Keys: While some third-party sites claim to offer "free" or "new" registration keys, these often lead to security risks like malware or denial-of-service crashes. For a safe and verified experience, always use the official Modbus Tools ordering page. 🚀 Key Features
Modbus Poll provides several advanced tools for industrial communication testing: Witte Software ordering information - Modbus Tools
If you are coming from v7 or v8, these are the game-changers:
The key unlocks the "Slave Simulator" mode. You can simulate up to 100 slave IDs simultaneously. This is perfect for testing a new master controller before it goes to the field.
Why upgrade to the latest version? Old keys (v5/v6) miss critical industrial features. Here is what a new license unlocks in 2023-2024: