Your DAQ device can generate a trigger on a digital signal. You must specify a source and an edge. The digital source can be any of the PFI, RTSI, or PXI_STAR signals.

The edge can be either the rising edge or falling edge of the digital signal. A rising edge is a transition from a low logic level to a high logic level. A falling edge is a high-to-low transition. The following figure shows a falling-edge trigger.

Figure 86. Falling-Edge Trigger

You can also program your DAQ device to perform an action in response to a trigger from a digital source. The action can affect the following:

  • Analog input acquisition
  • Analog output generation
  • Counter behavior
  • Digital waveform acquisition and generation