Once purchased, you will receive a registration key via email.
| Tool | Protocol | Cost | Best For | | :--- | :--- | :--- | :--- | | | TCP only | Free (Open Source) | Quick register reads on Ethernet devices. | | CAS Modbus Scanner | RTU & TCP | Free for 30 days (then nagware) | Discovering unknown slave IDs. | | Simply Modbus | RTU & TCP | Free 2-hour session limit | Training and learning Modbus basics. | | ModScan64 | RTU & TCP | $99 (Cheaper alternative) | Lightweight, no-frills polling. | modbus poll license key top
To obtain a legitimate license key, you should purchase one directly from the developer or an authorized reseller: Single User License : Typically priced at for a single license. Volume Discounts : Prices drop for bulk purchases (e.g., 3-9 licenses cost Purchase Link : You can buy a key on the Witte Software Ordering Page Modbus Tools Free Alternatives Once purchased, you will receive a registration key
Once you have your legitimate key, entering it incorrectly is surprisingly common. Here is the "top" method to ensure activation works: | | Simply Modbus | RTU & TCP