Device Pinout and Signal Descriptions

The following figure shows the digital terminal assignments.

Figure 5. NI USB-6501 Device Pinout

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The following table describes the signals available on the I/O connectors.

Table 2. Signal Descriptions
Signal Name Direction Description
P0.<0..7>, P1.<0..7>, P2.<0..6> Input or Output Digital I/O Signals: You can individually configure each signal as an input or output.
P2.7/PFI 0 Input or Output

This pin is configurable as either a digital line or an event counter.

Digital I/O Signal: As a digital line, this signal can be used as an input or output.

CTR: As a counter, this signal can be used as an event counter input source.

+5 V Output The voltage source provided by the USB host. The voltage is nominally 5 V, but varies from system to system.
GND — Ground: The reference for the digital signals and the +5 VDC supply.