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I'm looking for FOSS (for commercial use) VCL components for Delphi or libraries for Visual Basic/C/C++/C# ... basically, just something to abstract the h/w for development, although a h/w simulator might be useful for testing.

Does anyone know what is available?

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Take a look at MODBUS simulator here. This one is also worth a look. For Delphi components take a look here, here, and if you don't mind the nag screen here.

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JaMod is an open source Java implementation of the Modbus protocol. I've used it before to simulate a Modbus master device. I believe you could use it to simulate the slave device as well.

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