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NI cDAQTM-918x/919xUser ManualNI CompactDAQ 9181/9184/9188 Ethernet Chassis and NI CompactDAQ 9191 Wireless ChassisNI cDAQ-918x/919x User Manualni.com

© National Instruments | 1-11Getting Started with the cDAQ ChassisThis chapter provides a cDAQ chassis overview and lists information about mounting t

© National Instruments | 5-31NI cDAQ-918x/919x User ManualFigure 5-34 shows a block diagram of the frequency generator.Figure 5-34. Frequency Generat

5-32 | ni.comChapter 5 CountersPulse Generation for ETSIn the equivalent time sampling (ETS) application, the counter produces a pulse on the output a

© National Instruments | 5-33NI cDAQ-918x/919x User Manual• Counter n Up_Down Signal• Counter n HW Arm Signal• Counter n Sample Clock Signal• Counter

5-34 | ni.comChapter 5 CountersRouting a Signal to Counter n SourceEach counter has independent input selectors for the Counter n Source signal. Any o

© National Instruments | 5-35NI cDAQ-918x/919x User ManualSome of these options may not be available in some driver software. Refer to the Device Rout

5-36 | ni.comChapter 5 CountersCounter n Up_Down SignalCounter n Up_Down is another name for the Counter n B signal.Counter n HW Arm SignalThe Counter

© National Instruments | 5-37NI cDAQ-918x/919x User ManualUsing an Internal SourceTo use Counter n Sample Clock with an internal source, specify the s

5-38 | ni.comChapter 5 CountersRouting Frequency Output to a TerminalYou can route Frequency Output to any PFI terminal. Default Counter/Timer Routing

© National Instruments | 5-39NI cDAQ-918x/919x User ManualOther Counter FeaturesThe following sections list the other counter features available on th

5-40 | ni.comChapter 5 Counters80 MHz Source ModeIn 80 MHz source mode, the chassis synchronizes signals on the rising edge of the source, and counts

1-2 | ni.comChapter 1 Getting Started with the cDAQ ChassisFigure 1-2 shows the NI cDAQ-9184 chassis.Figure 1-2. NI cDAQ-9184 ChassisFigure 1-3 shows

© National Instruments | 6-16Digital Routing and Clock GenerationThis chapter describes the digital routing and clock routing circuitry on the cDAQ ch

6-2 | ni.comChapter 6 Digital Routing and Clock Generation80 MHz TimebaseYou can use the 80 MHz Timebase as the Source input to the 32-bit general-pur

© National Instruments | A-1ANI cDAQ-9191 Regulatory InformationUnited StatesThis product generates and radiates radio frequency energy. To comply wit

A-2 | ni.comAppendix A NI cDAQ-9191 Regulatory InformationThis device has been certified for use in Canada. Status of the listing in the Industry Cana

© National Instruments | A-3NI cDAQ-918x/919x User ManualEU Regulatory StatementsČesky [Czech]National Instruments tímto prohlašuje, že tento NI cDAQ-

A-4 | ni.comAppendix A NI cDAQ-9191 Regulatory InformationNote Refer to the Declaration of Conformity (DoC) for this product for any additional regula

© National Instruments | A-5NI cDAQ-918x/919x User ManualTaiwan R.O.C.Brasil – Aviso da AnatelEste equipamento opera em caráter secundário, isto é, nã

© National Instruments | B-1BWhere to Go from HereThis section lists where you can find example programs for the cDAQ chassis and C Series modules and

B-2 | ni.comAppendix B Where to Go from HereNI-DAQmxThe NI-DAQ Readme lists which devices, ADEs, and NI application software are supported by this ver

© National Instruments | B-3NI cDAQ-918x/919x User ManualThe NI-DAQmx Library book of the LabWindows/CVI Help contains API overviews and function refe

© National Instruments | 1-3NI cDAQ-918x/919x User ManualSafety GuidelinesOperate the NI cDAQ-918x/919x chassis only as described in this user manual.

B-4 | ni.comAppendix B Where to Go from Here.NET Languages without NI Application SoftwareWith the Microsoft .NET Framework, you can use NI-DAQmx to c

© National Instruments | C-1CTechnical Support and Professional ServicesLog in to your National Instruments ni.com User Profile to get personalized ac

C-2 | ni.comAppendix C Technical Support and Professional ServicesYou also can visit the Worldwide Offices section of ni.com/niglobal to access the br

© National Instruments | I-1IndexSymbols<20 MHz source mode, 5-40Numerics10/100 LED, 1-2610/100/1000 LED, 1-2680 MHz source mode, 5-40Aaccessories,

IndexI-2 | ni.comunpacking, 1-5using, 1-31cDAQ module interface, 1-32channel Z behavior, 5-20chassis grounding screw, 1-25choosing frequency measureme

NI cDAQ-918x/919x User Manual© National Instruments | I-3Eedge counting, 5-3buffered, 5-4on-demand, 5-3sample clock, 5-4single point, 5-3edge-separati

IndexI-4 | ni.comMMAX chassis reservation, 1-14Measurement Studio documentation, B-3measurementsbuffered two-signal edge-separation, 5-22choosing freq

NI cDAQ-918x/919x User Manual© National Instruments | I-5simple pulse generation, 5-24singlepoint edge counting, 5-3pulse generation, 5-24retriggerabl

1-4 | ni.comChapter 1 Getting Started with the cDAQ ChassisSpecial Conditions for Hazardous Locations Use in EuropeThis equipment has been evaluated a

© National Instruments | 1-5NI cDAQ-918x/919x User ManualHardware Symbol DefinitionsThe following symbols are marked on your cDAQ chassis. Caution Whe

1-6 | ni.comChapter 1 Getting Started with the cDAQ ChassisNote The NI-DAQmx software is included on the disk shipped with your kit and is available f

© National Instruments | 1-7NI cDAQ-918x/919x User ManualFigure 1-4. Ring Lug Attached to Chassis Ground Terminal5. Make sure that no signals are con

1-8 | ni.comChapter 1 Getting Started with the cDAQ ChassisNote Connect I/O cable shields to the chassis grounding screw, shown in Figure 1-4, unless

© National Instruments | 1-9NI cDAQ-918x/919x User ManualBefore connecting to an enterprise network, you may first need to upload a certificate by cli

1-10 | ni.comChapter 1 Getting Started with the cDAQ ChassisNote Establishing a network connection may take several seconds.Note For more information

SupportWorldwide Technical Support and Product Informationni.comWorldwide OfficesVisit ni.com/niglobal to access the branch office websites, which pro

© National Instruments | 1-11NI cDAQ-918x/919x User ManualOtherwise, enter the hostname of the chassis. The default hostname is cDAQ91xx-<serial nu

1-12 | ni.comChapter 1 Getting Started with the cDAQ ChassisNote If you connected the cDAQ chassis directly to your computer, the setup time may be lo

© National Instruments | 1-13NI cDAQ-918x/919x User Manual17. If the cDAQ chassis is not reserved automatically, select the chassis and click the Rese

1-14 | ni.comChapter 1 Getting Started with the cDAQ ChassisReserving the Chassis in MAXWhen the cDAQ chassis is connected to a network, multiple user

© National Instruments | 1-15NI cDAQ-918x/919x User ManualMounting the cDAQ ChassisYou can use the cDAQ chassis on a desktop or mount it to a panel, w

1-16 | ni.comChapter 1 Getting Started with the cDAQ ChassisNI 9901 Desktop Kit for NI cDAQ-9184/9188 ChassisThe NI 9901 desktop mounting kit includes

© National Instruments | 1-17NI cDAQ-918x/919x User ManualNI cDAQ-9181/9191You can panel mount the cDAQ chassis with or without a panel mount kit:Note

1-18 | ni.comChapter 1 Getting Started with the cDAQ ChassisFigure 1-9. NI 9903 Panel Mount Accessory Dimensions101.6 mm(4.00 in.)59.7 mm(2.35 in.) 3

© National Instruments | 1-19NI cDAQ-918x/919x User Manual• Panel Mounting without a Panel Mount Kit—Threaded holes are located in the cDAQ chassis fo

1-20 | ni.comChapter 1 Getting Started with the cDAQ ChassisNI cDAQ-9184/9188You can panel mount the cDAQ chassis with or without a panel mount kit:•

Legal InformationLimited WarrantyThis document is provided ‘as is’ and is subject to being changed, without notice, in future editions. For the latest

© National Instruments | 1-21NI cDAQ-918x/919x User ManualFigure 1-11. NI cDAQ-9184/9188 Panel Mount Dimensions and Installation8765432128.1 mm(1.11

1-22 | ni.comChapter 1 Getting Started with the cDAQ Chassis• Panel Mounting without a Panel Mount Kit—You can mount the cDAQ chassis directly on a fl

© National Instruments | 1-23NI cDAQ-918x/919x User ManualNI cDAQ-9181/9191The NI 9913 DIN rail mounting kit contains one clip for mounting the cDAQ c

1-24 | ni.comChapter 1 Getting Started with the cDAQ ChassisFigure 1-14. DIN Rail Clip Parts Locator DiagramCaution Remove the I/O module before remo

© National Instruments | 1-25NI cDAQ-918x/919x User ManualNI cDAQ Chassis FeaturesThe cDAQ chassis features a chassis grounding screw, LEDs, reset but

1-26 | ni.comChapter 1 Getting Started with the cDAQ ChassisLEDsThe statuses for the 10/100/10001, LINK/ACT, POWER, STATUS, and ACTIVE LED indicators

© National Instruments | 1-27NI cDAQ-918x/919x User ManualTable 1-4. Wireless Signal Strength LED State/Chassis StatusLED State LED Pattern Chassis S

1-28 | ni.comChapter 1 Getting Started with the cDAQ ChassisEthernet CablingTable 1-5 shows the shielded Ethernet cable wiring connections for both st

© National Instruments | 1-29NI cDAQ-918x/919x User ManualReset ButtonThe cDAQ chassis is equipped with a reset button.Pressing the reset button resul

1-30 | ni.comChapter 1 Getting Started with the cDAQ ChassisCables and AccessoriesTable 1-7 contains information about cables and accessories availabl

EtherCAT® is a registered trademark of and licensed by Beckhoff Automation GmbH.CANopen® is a registered Community Trademark of CAN in Automation e.V.

© National Instruments | 1-31NI cDAQ-918x/919x User ManualUsing the cDAQ ChassisThe cDAQ system consists of three parts: C Series I/O module(s), the c

1-32 | ni.comChapter 1 Getting Started with the cDAQ ChassisParallel versus Serial DIO ModulesDigital I/O module capabilities are determined by the ty

© National Instruments | 1-33NI cDAQ-918x/919x User Manual• Independent Data Streams—The NI cDAQ-9181/9191 supports six independent high-speed data st

© National Instruments | 2-12Analog InputTo perform analog input measurements, insert a supported analog input C Series I/O module into any slot on th

2-2 | ni.comChapter 2 Analog Input• AI Reference Trigger Signal*• AI Pause Trigger Signal*Signals with an * support digital filtering. Refer to the PF

© National Instruments | 2-3NI cDAQ-918x/919x User ManualScanned ModulesScanned C Series analog input modules contain a single A/D converter and a mul

2-4 | ni.comChapter 2 Analog Inputrelative to non-sigma-delta modules in the system. This input delay is specified in the C Series I/O module document

© National Instruments | 2-5NI cDAQ-918x/919x User ManualAn acquisition that uses a start trigger (but not a reference trigger) is sometimes referred

2-6 | ni.comChapter 2 Analog InputWhen the reference trigger occurs, the cDAQ chassis continues to write samples to the buffer until the buffer contai

© National Instruments | 2-7NI cDAQ-918x/919x User ManualUsing an Analog SourceSome C Series I/O modules can generate a trigger based on an analog sig

© National Instruments | vContentsChapter 1Getting Started with the cDAQ ChassisSafety Guidelines...

© National Instruments | 3-13Analog OutputTo generate analog output, insert an analog output C Series I/O module in any slot on the cDAQ chassis. The

3-2 | ni.comChapter 3 Analog OutputHardware-Timed GenerationsWith a hardware-timed generation, a digital hardware signal controls the rate of the gene

© National Instruments | 3-3NI cDAQ-918x/919x User ManualAnalog Output Triggering SignalsAnalog output supports two different triggering actions: AO S

3-4 | ni.comChapter 3 Analog OutputRouting AO Sample Clock to an Output TerminalYou can route AO Sample Clock to any output PFI terminal. AO Sample Cl

© National Instruments | 3-5NI cDAQ-918x/919x User ManualAO Pause Trigger SignalUse the AO Pause Trigger signal (ao/PauseTrigger) to mask off samples

3-6 | ni.comChapter 3 Analog OutputWhen you use an analog trigger source, the samples are paused when the Analog Comparison Event signal is at a high

© National Instruments | 4-14Digital Input/Output and PFIThis chapter describes the digital input/output (DIO) and Programmable Function Interface (PF

4-2 | ni.comChapter 4 Digital Input/Output and PFIStatic DIOEach of the DIO lines can be used as a static DI or DO line. You can use static DIO lines

© National Instruments | 4-3NI cDAQ-918x/919x User ManualDI Sample Clock SignalUse the DI Sample Clock (di/SampleClock) signal to sample digital I/O o

4-4 | ni.comChapter 4 Digital Input/Output and PFIUsing an External SourceYou can route the following signals as DI Sample Clock:• Any PFI terminal• A

Contentsvi | ni.comAI Sample Clock Signal ...2-2Routing the Sa

© National Instruments | 4-5NI cDAQ-918x/919x User ManualRouting DI Start Trigger to an Output TerminalYou can route DI Start Trigger to any output PF

4-6 | ni.comChapter 4 Digital Input/Output and PFIUsing an Analog SourceSome C Series I/O modules can generate a trigger based on an analog signal. In

© National Instruments | 4-7NI cDAQ-918x/919x User ManualIn NI-DAQmx, the filter is programmed by setting the minimum pulse width, Tp1, that will pass

4-8 | ni.comChapter 4 Digital Input/Output and PFIChange detection acquisitions can be buffered or nonbuffered: • Nonbuffered Change Detection Acquisi

© National Instruments | 4-9NI cDAQ-918x/919x User ManualHardware-timed generations have several advantages over software-timed acquisitions:• The tim

4-10 | ni.comChapter 4 Digital Input/Output and PFIDigital Output Triggering SignalsDigital output supports two different triggering actions: DO Start

© National Instruments | 4-11NI cDAQ-918x/919x User ManualDO Sample Clock Timebase SignalThe DO Sample Clock Timebase (do/SampleClockTimebase) signal

4-12 | ni.comChapter 4 Digital Input/Output and PFIWhen you generate digital output signals, the generation pauses as soon as the pause trigger is ass

© National Instruments | 4-13NI cDAQ-918x/919x User ManualGetting Started with DO Applications in SoftwareYou can use the cDAQ chassis in the followin

4-14 | ni.comChapter 4 Digital Input/Output and PFIAssume that an input terminal has been low for a long time. The input terminal then changes from lo

NI cDAQ-918x/919x User Manual© National Instruments | viiChapter 4Digital Input/Output and PFIDigital Input/Output ...

© National Instruments | 5-15CountersThe cDAQ chassis has four general-purpose 32-bit counter/timers and one frequency generator. The general-purpose

5-2 | ni.comChapter 5 CountersCounter Timing EngineUnlike analog input, analog output, digital input, and digital output, the cDAQ chassis counters do

© National Instruments | 5-3NI cDAQ-918x/919x User ManualCounter Input ApplicationsThe following sections list the various counter input applications

5-4 | ni.comChapter 5 CountersYou also can use a pause trigger to pause (or gate) the counter. When the pause trigger is active, the counter ignores e

© National Instruments | 5-5NI cDAQ-918x/919x User ManualControlling the Direction of CountingIn edge counting applications, the counter can count up

5-6 | ni.comChapter 5 CountersFigure 5-5 shows an example of a single pulse-width measurement.Figure 5-5. Single Pulse-Width MeasurementImplicit Buff

© National Instruments | 5-7NI cDAQ-918x/919x User ManualFigure 5-7 shows an example of a sample clocked buffered pulse-width measurement.Figure 5-7.

5-8 | ni.comChapter 5 CountersSingle Pulse MeasurementSingle (on-demand) pulse measurement is equivalent to two single pulse-width measurements on the

© National Instruments | 5-9NI cDAQ-918x/919x User ManualFigure 5-10 shows an example of a sample clocked buffered pulse measurement.Figure 5-10. Sam

5-10 | ni.comChapter 5 CountersImplicit Buffered Semi-Period MeasurementIn implicit buffered semi-period measurements, on each edge of the Gate signal

Contentsviii | ni.comFrequency Measurement...5-10Low Frequency

© National Instruments | 5-11NI cDAQ-918x/919x User Manual• Large Range of Frequencies with Two Counters• Sample Clocked Buffered Frequency Measuremen

5-12 | ni.comChapter 5 CountersFigure 5-13 illustrates this method. Another option is to measure the width of a known period instead of a known pulse.

© National Instruments | 5-13NI cDAQ-918x/919x User ManualYou can route the signal to measure to the Source input of Counter 0, as shown in Figure 5-1

5-14 | ni.comChapter 5 CountersFigure 5-15. Sample Clocked Buffered Frequency Measurement (Averaging)When CI.Freq.EnableAveraging is set to false, th

© National Instruments | 5-15NI cDAQ-918x/919x User ManualDivide down (N) is the integer to divide down measured frequency, only used in large range

5-16 | ni.comChapter 5 CountersWhich Method Is Best?This depends on the frequency to be measured, the rate at which you want to monitor the frequency

© National Instruments | 5-17NI cDAQ-918x/919x User ManualFrom this, you can see that while the measurement time for one counter is shorter, the accur

5-18 | ni.comChapter 5 Counters• Measuring a large range of frequencies with two counters measures high and low frequency signals accurately. However,

© National Instruments | 5-19NI cDAQ-918x/919x User ManualPosition MeasurementYou can use the counters to perform position measurements with quadratur

5-20 | ni.comChapter 5 Counters• X4 Encoding—Similarly, the counter increments or decrements on each edge of channels A and B for X4 encoding. Whether

NI cDAQ-918x/919x User Manual© National Instruments | ixCounter n A, Counter n B, and Counter n Z Signals ...

© National Instruments | 5-21NI cDAQ-918x/919x User ManualMeasurements Using Two Pulse EncodersThe counter supports two pulse encoders that have two c

5-22 | ni.comChapter 5 CountersAfter the counter has been armed and an active edge occurs on the Aux input, the counter counts the number of rising (o

© National Instruments | 5-23NI cDAQ-918x/919x User Manualthe count in the FIFO. On the next active edge of the Gate signal, the counter begins anothe

5-24 | ni.comChapter 5 CountersCounter Output ApplicationsThe following sections list the various counter output applications available on the cDAQ ch

© National Instruments | 5-25NI cDAQ-918x/919x User ManualSingle Pulse Generation with Start TriggerThe counter can output a single pulse in response

5-26 | ni.comChapter 5 CountersFigure 5-28. Finite Pulse Train Generation: Four Ticks Initial Delay, Four PulsesRetriggerable Pulse or Pulse Train Ge

© National Instruments | 5-27NI cDAQ-918x/919x User ManualFigure 5-30 shows the same pulse train with CO.EnableInitalDelayOnRetrigger set to the defau

5-28 | ni.comChapter 5 CountersContinuous pulse train generation is sometimes called frequency division. If the high and low pulse widths of the outpu

© National Instruments | 5-29NI cDAQ-918x/919x User ManualFigure 5-32. Finite Implicit Buffered Pulse Train GenerationContinuous Buffered Implicit Pu

5-30 | ni.comChapter 5 CountersFigure 5-33. Finite Buffered Sample Clocked Pulse Train GenerationThere are several different methods of continuous ge