National Instruments USB-6501 USB Digital I/O Device Features Small, Portable Digital I/O Device(24) Digital I/O Lines(1) 32-Bit CounterOvervoltage Protection, 8.5 mA Current DriveFull-Speed USB (12 Mbit/s) Bus InterfaceBuilt-In Screw Terminals with Removable Connectors for Easier Connectivity Th
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