This product is an USB2.0-compliant digital I/O unit that extends the input/output function of bi-directional digital signal. This product has up to 48 unisolated TTL-level input/output channels that is powered by the equivalence to the mode 0 ofi8255 chips, and you can use up to 48 channels of the input signals as interrupt inputs. You can select the input/output by the application software in eight signals units (in four signals unit for some inputs/outputs). As there is compatible with PCI bus-compatible board DIO-48D2-PCI and PCI Express bus-compatible board DIO-48D-PE in terms of connector shape and pin assignments, it is easy to migrate from the existing system. Windows driver is bundled with this product. Possible to be used as a data recording device for LabVIEW, with dedicated libraries.