Downloading Modbus Rtu AxtiveX 1.0 from our website was free. The software lies within Internet & Network Tools, more precisely Network Tools. The most popular version among the program users is 1.4. The actual developer of the software is ModbusTools.
From the developer:
MBAXP is a powerful and simple to use Modbus ActiveX control that allows Visual Basic, Delphi, Excel and other OLE Container applications to quickly and easily access data from a Modbus slave device connected to the PC. MBAXP supports both RTU, ASCII modes and TCP/IP connections.
The communication in each instance of MBAXP runs in its own thread. That means: Your program does not stop responding while waiting for Modbus transactions to finish.
You may want to check out more software, such as Simply Modbus Master, MatrikonOPC Server for Modbus or OPC Modbus Serial Server, which might be similar to Modbus Rtu AxtiveX.