The NI USB-6501 is a compact, USB-powered digital I/O device with 24 individually configurable lines. One line can alternatively serve as the input to a 32-bit event counter.
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Key product information and technical features.
The USB-6501 connects digital monitoring and control signals directly to a computer through USB. Each line can be configured independently as an input or output; static digital reads and writes are software-timed.
Outputs support open-collector or active-drive operation. The shared P2.7/PFI 0 terminal can instead count falling-edge events, so counter use consumes one digital I/O line.
Verified product specifications.
| Digital I/O line count | 24 lines |
|---|---|
| Output driver types | Active drive (push-pull) or open collector (open-drain), software-selectable |
| Counter | One 32-bit falling-edge counter on P2.7/PFI 0 |
| Maximum counter input frequency | 5 MHz |
| Minimum counter pulse widths | 100 high; 100 low ns |
| USB interface | USB 2.0 Full Speed, 12 Mb/s |
| USB connector | One USB Series B receptacle |
| I/O connectors | Two 16-position screw-terminal plug headers |
| Terminal wire size | 16–28 AWG copper conductor |
| Maximum total sourced output current | 65 across all digital outputs simultaneously in active-drive mode mA |
| Dimensions with connectors | 8.18 × 8.51 × 2.31 cm |
| Weight | 84 g |
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Computer connection and bus power
Digital I/O and event counting
The user guide documents NI-DAQmx support. Check the selected driver release documentation for operating-system and development-environment support.
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Product-specific answers based on available technical information.
Its static digital input samples and output updates are software-timed. The 12 Mb/s USB bus rate is not a digital sampling or output-update rate.
No. Output capability depends on driver mode, logic level, and load. Open-collector operation may require an external pull-up resistor for increased source current. In active-drive mode, total current sourced by all outputs must not exceed 65 mA.