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As far as I am aware, you will have to discuss this issue with National Instruments. I don't believe that MAX is capable of recognizing non-National Instruments hardware.
Start by going to http://ni.com/ask and starting a support question. More than likely they will direct you to hardware engineering.
Having reread your question a few times, I am starting to sense that there is something else that needs to be addressed. You mentioned that the instrument is FireWire. I am not sure how NI currently addresses FireWire, be it serial or GPIB, or some other format. If this is the case, it would be a VISA instrument. If this is the case, then if MAX is FireWire compatible, then you are probably going to be successful. If MAX is not currently FireWi
re compatible, you may be on your own to create an instrument driver.
Contact NI about this issue. They can probably be of the greatest assistance.
Also, please let me know if I am off the mark on this one. I am assuming that by 1394 that you mean IEEE1394, FireWire. As I don't have any FireWire instrumentation, I can't really advise you on that.