USED National Instruments PXIe-7820R R Series Digital I/O

National Instruments NI PXI-6508 Digital I/O 96-channel 5 V TTL/CMOS 2.5 mA PXI.

National Instruments NI PXI-6509 Industrial Digital I/O Card Module

*USA* National Instruments NI PXI-6534 Digital I/O Module

National Instruments NI PXI-6513 PXI Digital I/O Module

National Instruments PXI-6527 NI DAQ Card, Isolated Digital I/O, Relays

National Instruments NI PXI-6552 100MHz Digital I/O Signal Gen. Analyzer

Original New National Instruments NI PXI-6513 778971-01 PXI Digital I/O Board