JMB394 and S.M.A.R.T. passthrough

Greetings,

I have got an interesting SATA DAS device CFI-B4043JDGG [1] that was
based on JMB394 [2] PMP.
The problem is that I can't get SMART data from HDD through JMB394
with smartmontools [3].
The only way to get data is to use some proprietary tool named
"jmicron hw raid manager".
Seems like it uses some proprietary ATA extensions that wasn't
supported but smartmontools.

Could you advise me a way to sniff somehow that ATA commands?
If I can get them then I could try to implement something like
pmpjmicron (by analogy with usbjmicron).

[1] http://www.cfi-rus.ru/cfib4043jdgg-text (only russian)
[2] http://www.jmicron.com/PDF/brief/jmb394.pdf
[3] https://gist.github.com/Am1GO/f81029f3f2f6771e4281

-- 
Kind regards,
Vladimir.

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