National Instruments NI cDAQ-9181 User Manual

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Contents

National Instruments NI cDAQ-9181 User Manual Manual pdf 7 page image

NI cDAQ-9181/9184/9188/9191 User Manual© National Instruments | viiMinimizing Glitches on the Output Signal....................................................................... 3-6Getting Started with AO Applications in Software .......................................................... 3-6Chapter 4Digital Input/Output and PFIDigital Input/Output ......................................................................................................... 4-1Serial DIO versus Parallel DIO Modules ................................................................. 4-1Static DIO ................................................................................................................. 4-2Digital Input.............................................................................................................. 4-2Digital Input Triggering Signals....................................................................... 4-2Digital Input Timing Signals ............................................................................ 4-2Digital Input Filters .......................................................................................... 4-6Getting Started with DI Applications in Software............................................ 4-7Change Detection Event ........................................................................................... 4-7Routing Change Detection Event to an Output Terminal................................. 4-7Change Detection Acquisition.......................................................................... 4-7Digital Output ........................................................................................................... 4-8Digital Output Data Generation Methods......................................................... 4-8Digital Output Triggering Signals .................................................................... 4-10Digital Output Timing Signals ......................................................................... 4-10Getting Started with DO Applications in Software .......................................... 4-13Digital Input/Output Configuration for NI 9401 ...................................................... 4-13PFI .................................................................................................................................... 4-13PFI Filters ................................................................................................................. 4-13Chapter 5CountersCounter Timing Engine .................................................................................................... 5-2Counter Input Applications .............................................................................................. 5-3Counting Edges......................................................................................................... 5-3Single Point (On-Demand) Edge Counting ...................................................... 5-3Buffered (Sample Clock) Edge Counting......................................................... 5-4Controlling the Direction of Counting.............................................................. 5-5Pulse-Width Measurement ....................................................................................... 5-5Single Pulse-Width Measurement .................................................................... 5-6Implicit Buffered Pulse-Width Measurement................................................... 5-6Sample Clocked Buffered Pulse-Width Measurement ..................................... 5-6Pulse Measurement................................................................................................... 5-7Single Pulse Measurement................................................................................ 5-8Implicit Buffered Pulse Measurement.............................................................. 5-8Sample Clocked Buffered Pulse Measurement ................................................ 5-8Semi-Period Measurement ....................................................................................... 5-9Single Semi-Period Measurement .................................................................... 5-9Implicit Buffered Semi-Period Measurement................................................... 5-10Pulse versus Semi-Period Measurements ......................................................... 5-10