© National Instruments
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Chapter 4
Digital Input/Output and PFI
Serial DIO versus Parallel DIO Modules ................................................................. 4-1
Static DIO ................................................................................................................. 4-1
Digital Input.............................................................................................................. 4-2
Digital Input Triggering Signals....................................................................... 4-2
Digital Input Timing Signals ............................................................................ 4-2
Digital Input Filters .......................................................................................... 4-6
Getting Started with DI Applications in Software............................................ 4-7
Digital Output Data Generation Methods......................................................... 4-8
Digital Output Triggering Signals .................................................................... 4-9
Digital Output Timing Signals ......................................................................... 4-10
Getting Started with DO Applications in Software .......................................... 4-12
Counter Timing Engine .................................................................................................... 5-2
Counter Input Applications .............................................................................................. 5-3
Single Point (On-Demand) Edge Counting ...................................................... 5-3
Buffered (Sample Clock) Edge Counting......................................................... 5-4
Controlling the Direction of Counting.............................................................. 5-4
Single Pulse-Width Measurement .................................................................... 5-5
Implicit Buffered Pulse-Width Measurement................................................... 5-6
Sample Clocked Buffered Pulse-Width Measurement..................................... 5-6
Single Pulse Measurement................................................................................ 5-7
Implicit Buffered Pulse Measurement.............................................................. 5-7
Sample Clocked Buffered Pulse Measurement ................................................ 5-8