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The NI‑9401 is a configurable digital I/O interface for input or output in 4‑bit increments. Therefore, the NI‑9401 can create three configurations: 8 digital inputs, 8 digital outputs, or four digital inputs and four digital outputs. With reconfigurable I/O (RIO) technology (CompactRIO only), you can use the LabVIEW FPGA Module to program the NI‑9401 for implementing custom, high-speed counter/timers; digital communication protocols; pulse generation; and more. Each channel features transient isolation between the I/O channels and the backplane.
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