Solution:

The I/O registers format of PCL-712 are very similar to PCL-812. But PCL-712 doesn't support hardware interrupt, so only the software trigger mode can work. We've checked the codes of PCL-812 32-bit DLL drivers. It seems the software trigger fucnitons could be applied to PCL-712. Since PCL-712 is too old, we can't find a card to check it with the PCL-812 software driver. Please download the PCL-812 drivers from our support website, then test if PCL-712 will work with it.