The negative-common typed PCI Express bus-compliant interface board is used to provide the PC with a digital signal I/O function. This product is capable to input and output digital signals at 12 - 24VDC. It contains 128 opto-coupler isolated outputs (current source type). The product is bundled with windows/Linux driver and is equipped with the output transistor protection circuit (surge voltage protection and overcurrent protection). The interface board can be used as as a data recording device for or LabVIEW, with dedicated libraries.