I am going to re-post Garret's response to a similar question.
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You are correct that Multisim cannot simulate with real-time data, but as you noted, you can collect read data and feed this into Multisim.
For the question why is is hard to implement, there are a couple of reasons inherent in SPICE simulation. The most important is that simulation does not occur in real time, it is much slower. But even if you has sufficient computing power to simulate in real time, SPICE simulation sometimes goes backwards in time. Going backward in time is a fundamental "property" of SPICE simulation. So while you are acquring real time data, simulation may be going in the opposite direction! In theory, you could also solve this with sufficient computing power (by always taking very small time steps). All combined, todays best personal computers would need to increase their computing power several or more orders of magnitude.
Garret
Software Developer
National Instruments
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I am sorry this can't be accomplished within Multisim. There may be other options that I don't know about, but as it stands this just isn't going to be possible.
