Modbus Poll is . While you can download a "free trial," it has significant functional limits designed for short-term testing:
: For serial communication (requires COM port, Baud rate, Data bits, and Parity). Read/Write Definition to open the "Read/Write Definition" menu. : The address of your device (usually 1). Function Code
If you need a "full" Modbus master tool without the trial limitations, consider these open-source or free alternatives:
is a powerful Windows-based software application used to simulate a Modbus Master (Client) . It allows engineers, technicians, and developers to:
The "Modbus Poll" software is downloadable as a shareware/demo version. While this allows you to test the software's interface, it comes with significant limitations intended to encourage users to purchase a license.