This product is a negative-common typed PCI bus-compliant interface board used to provide a digital signal Input function on a PC. This product can input digital signals at 12 - 24VDC. This product features 128 opto-coupler isolated inputs (compatible with current source output signals). You can use 16 input signals as interrupt inputs. Equipped with the digital filter function to prevent wrong recognition of input signals is provided. Windows/Linux driver is bundled with this product. Possible to be used as a data recording device for LabVIEW, with dedicated libraries.