Digital I/O Circuitry

The following figure shows some common examples of connections of DIO lines with standard circuits. In the figure, P0.<0..7> is connected to example signals configured as digital inputs and digital outputs. You can configure P1.<0..7> and P2.<0..7> similarly.

Figure 7. Example of Connecting a Load

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  1. P0.0 configured as an open collector digital output driving an LED
  2. P0.2 configured as a active drive digital output driving an LED
  3. P0.4 configured as a digital input receiving a TTL signal from a gated inverter
  4. P0.7 configured as a digital input receiving a 0 V or 5 V signal from a switch
Caution Exceeding the maximum input voltage ratings or maximum output ratings listed in the device specifications can damage the DAQ device and the computer. National Instruments is not liable for any damage resulting from such signal connections.