Not everything in life has a ready-built simulator. If you've searched via google, then chances are that it
doesn't exist.
Sometimes you need to decide which _aspect_ of a device or system you wish to simulate, and program it yourself.
I'm surprised that people think otherwise.
The simulation could be as simple as an Excel workbook, or a Matlab function..
Here is an example:
Let's say I wish to simulate a small transmitter module that is going to be connected to a piece of logic. I may decide that all I need
to simulate the transmitter module is a 10k resistor, and that will similate the input to my transmitter module quite well.
If I want to see what data is being transmitted, I would stick a virtual oscilloscope or a virtual logic probe across the 10k resistor.
Quite simple..