This product is a negative-common typed PCI bus-compliant interface board used to provide a digital signal output function on a PC. This product can output digital signals at 12 - 24VDC. This product features 128 opto-coupler isolated outputs (current source type). Equipped with the output transistor protection circuit (surge voltage protection and overcurrent protection). Windows/Linux driver is bundled with this product. Possible to be used as a data recording device for LabVIEW, with dedicated libraries.