Create an test modbus master tool.

Hi, Is there someone that can help me to create an small Modbus test tool (which may be based on an existing open source environment) that is be able to: - Connect a Modbus slave (TCP/IP or RS485) with al the settings that are needed - Choice of what of testing environment you want to use (total 4) - Read and write preset datapoints And the testing environments are a kind of graphical picture that I want to instert by myself and want to insert on some points in a grid of the picture the different Modbus datapoint, So I can create a kind of preset GUI of a testing environment It's for a test project on a Arduino where I want to use a Modbus master/slave component. Questions let me know it. Regards,