Access to all features without artificial, time-based, or count-based restrictions.
Simply Modbus Master is a popular industrial communication tool used to test and debug Modbus RTU, ASCII, and TCP/IP devices
After payment, you will receive a confirmation email with transaction details. A second email from info@simplymodbus.ca will follow with your license key code. This is not an automated process—licenses are normally sent within an hour during office hours but may take overnight due to time zone differences. Office hours are Monday through Friday, 8 AM to 4 PM MST (UTC-0700).
If you are still on the fence about the purchase, or if the license key route isn't for you, there are open-source alternatives: simply modbus master license key
: Using the notes column and data type toggles to confirm the accuracy of received values.
: Once licensed, the software bypasses the demo startup window and allows unlimited reads and writes. The unlicensed version is restricted to sending only six request messages before requiring a program restart.
After successful entry, the full version unlocks. Demonstration mode limits sending and receiving to only 6 messages before requiring a restart, so if you find yourself working beyond this limit without restarting, you'll know the license was not correctly applied. Access to all features without artificial, time-based, or
The software automatically converts raw binary data into human-readable formats. It displays data as 16-bit and 32-bit signed or unsigned integers, floats, doubles, binary, and ASCII strings.
: Ensuring RS232/RS485 wiring and adapters (e.g., USB to 485) are correctly grounded and pinned.
A license can be transferred from one PC to another. Simply install the program and license on the new PC in the same way as the original. When prompted for a license code, use the same original license code. For good license management, uninstall the program from the original PC. This is not an automated process—licenses are normally
: It runs as a simple file that you can carry on a USB drive. Demo vs. Licensed Version
If you have purchased a key but the software still says "Invalid" or won't remember the key, try these fixes: