CIChannel Class

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Updated2023-02-21
33 minute(s) read

CIChannel Class

Encapsulates one counter/timer input channel and the properties for a counter/timer input channel.

Inheritance Hierarchy

SystemObject
  SystemMarshalByRefObject
    NationalInstruments.DAQmxChannel
      NationalInstruments.DAQmxCIChannel

Namespace: NationalInstruments.DAQmx
Assembly: NationalInstruments.DAQmx (in NationalInstruments.DAQmx.dll) Version: 20.7.40.49302

Syntax

public class CIChannel : Channel, IFilteredTypeDescriptor

Public Class CIChannel
	Inherits Channel
	Implements IFilteredTypeDescriptor

The CIChannel type exposes the following members.

Properties

	Name	Description
	AngularEncoderInitialAngle	Specifies the starting angle of the encoder. This value is in the units you specify with AngularEncoderUnits.
	AngularEncoderPulsesPerRevolution	Specifies the number of pulses the encoder generates per revolution. This value is the number of pulses on either signal A or signal B, not the total number of pulses on both signal A and signal B.
	AngularEncoderUnits	Specifies the units to use to return angular position measurements from the channel.
	Count	Indicates the current value of the count register.
	CountEdgesActiveEdge	Specifies on which edges to increment or decrement the counter.
	CountEdgesCountDirection	Specifies whether to increment or decrement the counter on each edge.
	CountEdgesCountDirectionDigitalFilterEnable	Specifies whether to apply the pulse width filter to the signal.
	CountEdgesCountDirectionDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the filter recognizes.
	CountEdgesCountDirectionDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	CountEdgesCountDirectionDigitalFilterTimebaseSource	Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
	CountEdgesCountDirectionDigitalSynchronizationEnable	Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
	CountEdgesCountDirectionHysteresis	Specifies a hysteresis level applied to the CountEdgesCountDirectionThresholdVoltage. The source signal must fall below CountEdgesCountDirectionThresholdVoltage minus the hysteresis before a change in count direction occurs.
	CountEdgesCountDirectionLogicLevelBehavior	Specifies the logic level behavior on the count reset line.
	CountEdgesCountDirectionTerminal	Specifies the source terminal of the digital signal that controls the count direction if CountEdgesCountDirection is ExternallyControlled.
	CountEdgesCountDirectionTerminalConfiguration	Specifies the input terminal configuration.
	CountEdgesCountDirectionThresholdVoltage	Specifies the voltage level applied to the Count Direction terminal. When the signal is above this threshold, the counter counts up. When the signal is below this threshold, the counter counts down.
	CountEdgesCountResetActiveEdge	Specifies on which edge of the signal to reset the count.
	CountEdgesCountResetDigitalFilterEnable	Specifies whether to apply the pulse width filter to the signal.
	CountEdgesCountResetDigitalFilterMinimumPulseWidth	Specifies the minimum pulse width the filter recognizes.
	CountEdgesCountResetDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	CountEdgesCountResetDigitalFilterTimebaseSource	Specifies the input of the signal to use as the timebase of the pulse width filter.
	CountEdgesCountResetDigitalSynchronizationEnable	Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
	CountEdgesCountResetEnable	Specifies whether to reset the count on the active edge specified with CountEdgesCountResetTerminal.
	CountEdgesCountResetHysteresis	Specifies a hysteresis level applied to CountEdgesCountResetThresholdVoltage. When CountEdgesCountResetActiveEdge is rising, the source signal must first fall below CountEdgesCountResetThresholdVoltage minus the hysteresis before a rising edge is detected at CountEdgesCountResetThresholdVoltage. When CountEdgesCountResetActiveEdge is falling, the source signal must first rise above CountEdgesCountResetThresholdVoltage plus the hysteresis before a falling edge is detected at CountEdgesCountResetThresholdVoltage.
	CountEdgesCountResetLogicLevelBehavior	Specifies the logic level behavior on the count reset line.
	CountEdgesCountResetResetCount	Specifies the value to reset the count to.
	CountEdgesCountResetTerminal	Specifies the input terminal of the signal to reset the count.
	CountEdgesCountResetTerminalConfiguration	Specifies the input terminal configuration.
	CountEdgesCountResetThresholdVoltage	Specifies the voltage level at which to recognize the counter reset event.
	CountEdgesDigitalFilterEnable	Specifies whether to apply the pulse width filter to the signal.
	CountEdgesDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the filter recognizes.
	CountEdgesDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	CountEdgesDigitalFilterTimebaseSource	Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
	CountEdgesDigitalSynchronizationEnable	Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
	CountEdgesGateDigitalFilterEnable	Specifies whether to apply the pulse width filter to the gate input signal.
	CountEdgesGateDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the digital filter recognizes.
	CountEdgesGateDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	CountEdgesGateDigitalFilterTimebaseSource	Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
	CountEdgesGateEnable	Specifies whether to enable the functionality to gate the counter input signal for a count edges measurement.
	CountEdgesGateHysteresis	Specifies a hysteresis level applied to the CountEdgesGateThresholdVoltage. When CountEdgesGatePauseState is High, the source signal must fall below CountEdgesGateThresholdVoltage minus the hysteresis before the counter resumes counting. When CountEdgesGatePauseState is Low, the source signal must rise above CountEdgesGateThresholdVoltage plus the hysteresis before the counter resumes counting.
	CountEdgesGateLogicLevelBehavior	Specifies the logic level behavior on the gate input line.
	CountEdgesGatePauseState	Specifies whether the counter gates input pulses while the signal is high or low.
	CountEdgesGateTerminal	Specifies the gate terminal.
	CountEdgesGateTerminalConfiguration	Specifies the gate terminal configuration.
	CountEdgesGateThresholdVoltage	Specifies the voltage level at which to recognize the counter gate signal.
	CountEdgesHysteresis	Specifies a hysteresis level to apply to CountEdgesThresholdVoltage. When CountEdgesActiveEdge is rising, the source signal must first fall below CountEdgesThresholdVoltage minus the hysteresis before a rising edge is detected at CountEdgesThresholdVoltage. When CountEdgesActiveEdge is falling, the source signal must first rise above CountEdgesThresholdVoltage plus the hysteresis before a falling edge is detected at CountEdgesThresholdVoltage.
	CountEdgesInitialCount	Specifies the starting value from which to count.
	CountEdgesLogicLevelBehavior	Specifies the logic level behavior on the input line.
	CountEdgesTerminal	Specifies the input terminal of the signal to measure.
	CountEdgesTerminalConfiguration	Specifies the input terminal configuration.
	CountEdgesThresholdVoltage	Specifies the voltage level at which to recognize waveform repetitions. Select a voltage level that occurs only once within the entire period of a waveform. You also can select a voltage that occurs only once while the voltage rises or falls.
	CounterTimebaseActiveEdge	Specifies whether a timebase cycle is from rising edge to rising edge or from falling edge to falling edge.
	CounterTimebaseDigitalFilterEnable	Specifies whether to apply the pulse width filter to the signal.
	CounterTimebaseDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the filter recognizes.
	CounterTimebaseDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	CounterTimebaseDigitalFilterTimebaseSource	Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
	CounterTimebaseDigitalSynchronizationEnable	Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
	CounterTimebaseMasterTimebaseDivisor	Specifies the divisor for an external counter timebase. You can divide the counter timebase in order to measure slower signals without causing the count register to roll over.
	CounterTimebaseRate	Specifies in Hertz the frequency of the counter timebase. Specifying the rate of a counter timebase allows you to take measurements in terms of time or frequency rather than in ticks of the timebase. If you use an external timebase and do not specify the rate, you can take measurements only in terms of ticks of the timebase.
	CounterTimebaseSource	Specifies the terminal of the timebase to use for the counter.
	CustomScaleName	Specifies the name of a custom scale for the channel.
	DataTransferMechanism	Specifies the data transfer mode for the channel.
	DataTransferRequestCondition	Specifies under what condition to transfer data from the onboard memory of the device to the buffer.
	Description	Specifies a user-defined description for the channel. (Inherited from Channel.)
	DuplicateCountPrevention	Specifies whether to enable duplicate count prevention for the channel. Duplicate count prevention is enabled by default. Setting Prescaler disables duplicate count prevention unless you explicitly enable it.
	DutyCycleDigitalFilterEnabled	Specifies whether to apply the pulse width filter to the signal.
	DutyCycleDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the digital filter recognizes.
	DutyCycleDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	DutyCycleDigitalFilterTimebaseSource	Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
	DutyCycleLogicLevelBehavior	Specifies the logic level behavior on the input line.
	DutyCycleStartingEdge	Specifies which edge of the input signal to begin the duty cycle measurement.
	DutyCycleTerminal	Specifies the input terminal of the signal to measure.
	DutyCycleTerminalConfiguration	Specifies the input terminal configuration.
	EncoderAInputDigitalFilterEnable	Specifies whether to apply the pulse width filter to the signal.
	EncoderAInputDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the filter recognizes.
	EncoderAInputDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	EncoderAInputDigitalFilterTimebaseSource	Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
	EncoderAInputDigitalSynchronizationEnable	Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
	EncoderAInputLogicLevelBehavior	Specifies the logic level behavior on the input line.
	EncoderAInputTerminal	Specifies the terminal to which signal A is connected.
	EncoderAInputTerminalConfiguration	Specifies the input terminal configuration.
	EncoderBInputDigitalFilterEnable	Specifies whether to apply the pulse width filter to the signal.
	EncoderBInputDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the filter recognizes.
	EncoderBInputDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	EncoderBInputDigitalFilterTimebaseSource	Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
	EncoderBInputDigitalSynchronizationEnable	Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
	EncoderBInputLogicLevelBehavior	Specifies the logic level behavior on the input line.
	EncoderBInputTerminal	Specifies the terminal to which signal B is connected.
	EncoderBInputTerminalConfiguration	Specifies the input terminal configuration.
	EncoderDecodingType	Specifies how to count and interpret the pulses the encoder generates on signal A and signal B. X1, X2, and X4 are valid for quadrature encoders only. TwoPulseCounting is valid for two-pulse encoders only.
	EncoderZIndexEnable	Specifies whether to use Z indexing for the channel.
	EncoderZIndexPhase	Specifies the states at which signal A and signal B must be while signal Z is high for NI-DAQmx to reset the measurement. If signal Z is never high while signal A and signal B are high, for example, you must choose a phase other than AHighBHigh.
	EncoderZIndexValue	Specifies the value to which to reset the measurement when signal Z is high and signal A and signal B are at the states you specify with EncoderZIndexPhase. Specify this value in the units of the measurement.
	EncoderZInputDigitalFilterEnable	Specifies whether to apply the pulse width filter to the signal.
	EncoderZInputDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the filter recognizes.
	EncoderZInputDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	EncoderZInputDigitalFilterTimebaseSource	Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
	EncoderZInputDigitalSynchronizationEnable	Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
	EncoderZInputLogicLevelBehavior	Specifies the logic level behavior on the input line.
	EncoderZInputTerminal	Specifies the terminal to which signal Z is connected.
	EncoderZInputTerminalConfiguration	Specifies the input terminal configuration.
	FilterDelay	Indicates the amount of time between when the input signal transitions and when the filtered sample is read by the host device. This value is in the units specified with FilterDelayUnits.
	FilterDelayUnits	Specifies the units of FilterDelay.
	FilterEnabled	Specifies the corresponding filter enable/disable state.
	FilterFrequency	Specifies the corresponding filter frequency (cutoff or center) of the filter response.
	FilterOrder	Specifies the corresponding filter order and defines the slope of the filter response.
	FilterResponse	Specifies the corresponding filter response and defines the shape of the filter response.
	FrequencyDigitalFilterEnable	Specifies whether to apply the pulse width filter to the signal.
	FrequencyDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the filter recognizes.
	FrequencyDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	FrequencyDigitalFilterTimebaseSource	Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
	FrequencyDigitalSynchronizationEnable	Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
	FrequencyDivisor	Specifies the value by which to divide the input signal if FrequencyMeasurementMethod is LargeRangeTwoCounter. The larger the divisor, the more accurate the measurement. However, too large a value could cause the count register to roll over, which results in an incorrect measurement.
	FrequencyEnableAveraging	Specifies whether to enable averaging mode for Sample Clock-timed frequency measurements.
	FrequencyHysteresis	Specifies a hysteresis level to apply to FrequencyThresholdVoltage. When FrequencyStartingEdge is rising, the source signal must first fall below FrequencyThresholdVoltage minus the hysteresis before a rising edge is detected at FrequencyThresholdVoltage. When FrequencyStartingEdge is falling, the source signal must first rise above FrequencyThresholdVoltage plus the hysteresis before a falling edge is detected at FrequencyThresholdVoltage.
	FrequencyLogicalLevelBehavior	Specifies the logic level behavior on the input line.
	FrequencyMeasurementMethod	Specifies the method to use to measure the frequency of the signal.
	FrequencyMeasurementTime	Specifies in seconds the length of time to measure the frequency of the signal if FrequencyMeasurementMethod is HighFrequencyTwoCounter. Measurement accuracy increases with increased measurement time and with increased signal frequency. If you measure a high-frequency signal for too long, however, the count register could roll over, which results in an incorrect measurement.
	FrequencyStartingEdge	Specifies between which edges to measure the frequency of the signal.
	FrequencyTerminal	Specifies the input terminal of the signal to measure.
	FrequencyTerminalConfiguration	Specifies the input terminal configuration.
	FrequencyThresholdVoltage	Specifies the voltage level at which to recognize waveform repetitions. Select a voltage level that occurs only once within the entire period of a waveform. You also can select a voltage that occurs only once while the voltage rises or falls.
	FrequencyUnits	Specifies the units to use to return frequency measurements.
	GpsSyncMethod	Specifies the method to use to synchronize the counter to a GPS receiver.
	GpsSyncSource	Specifies the terminal to which the GPS synchronization signal is connected.
	IsGlobal	Indicates whether the channel is a global channel. (Inherited from Channel.)
	LinearEncoderDistancePerPulse	Specifies the distance to measure for each pulse the encoder generates on signal A or signal B. This value is in the units you specify with LinearEncoderUnits.
	LinearEncoderInitialPosition	Specifies the position of the encoder when the measurement begins. This value is in the units you specify with LinearEncoderUnits.
	LinearEncoderUnits	Specifies the units to use to return linear encoder measurements from the channel.
	Maximum	Specifies the maximum value you expect to measure. This value is in the units you specify with a units property. When you query this property, it returns the coerced maximum value that the hardware can measure with the current settings.
	MaximumMeasurementPeriod	Specifies the maximum period (in seconds) in which the device will recognize signals. For frequency measurements, a signal with a higher period than the one set in this property will return 0 Hz. For duty cycle, the device will return 0 or 1 depending on the state of the line during the max defined period of time. Period measurements will return NaN. Pulse width measurement will return zero.
	MeasurementType	Indicates the measurement to take with the channel.
	MemoryMappingEnable	Specifies for NI-DAQmx to map hardware registers to the memory space of the application, if possible. Normally, NI-DAQmx maps hardware registers to memory accessible only to the kernel. Mapping the registers to the memory space of the application increases performance. However, if the application accesses the memory space mapped to the registers, it can adversely affect the operation of the device and possibly result in a system crash.
	Minimum	Specifies the minimum value you expect to measure. This value is in the units you specify with a units property. When you query this property, it returns the coerced minimum value that the hardware can measure with the current settings.
	NumberPossiblyInvalidSamples	Indicates the number of samples that the device might have overwritten before it could transfer them to the buffer.
	OutputState	Indicates the current state of the out terminal of the counter.
	PeriodDigitalFilterEnable	Specifies whether to apply the pulse width filter to the signal.
	PeriodDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the filter recognizes.
	PeriodDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	PeriodDigitalFilterTimebaseSource	Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
	PeriodDigitalSynchronizationEnable	Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
	PeriodDivisor	Specifies the value by which to divide the input signal if PeriodMeasurementMethod is LargeRangeTwoCounter. The larger the divisor, the more accurate the measurement. However, too large a value could cause the count register to roll over, which results in an incorrect measurement.
	PeriodEnableAveraging	Specifies whether to enable averaging mode for Sample Clock-timed period measurements.
	PeriodHysteresis	Specifies a hysteresis level to apply to PeriodThresholdVoltage. When PeriodStartingEdge is rising, the source signal must first fall below PeriodThresholdVoltage minus the hysteresis before a rising edge is detected at PeriodThresholdVoltage. When PeriodStartingEdge is falling, the source signal must first rise above PeriodThresholdVoltage plus the hysteresis before a falling edge is detected at PeriodThresholdVoltage.
	PeriodLogicLevelBehavior	Specifies the logic level behavior on the input line.
	PeriodMeasurementMethod	Specifies the method to use to measure the period of the signal.
	PeriodMeasurementTime	Specifies in seconds the length of time to measure the period of the signal if PeriodMeasurementMethod is HighFrequencyTwoCounter. Measurement accuracy increases with increased measurement time and with increased signal frequency. If you measure a high-frequency signal for too long, however, the count register could roll over, which results in an incorrect measurement.
	PeriodStartingEdge	Specifies between which edges to measure the period of the signal.
	PeriodTerminal	Specifies the input terminal of the signal to measure.
	PeriodTerminalConfiguration	Specifies the input terminal configuration.
	PeriodThresholdVoltage	Specifies the voltage level at which to recognize waveform repetitions. Select a voltage level that occurs only once within the entire period of a waveform. You also can select a voltage that occurs only once while the voltage rises or falls.
	PeriodUnits	Specifies the unit to use to return period measurements.
	PhysicalName	Specifies the name of the physical channel upon which this virtual channel is based. (Inherited from Channel.)
	Prescaler	Specifies the divisor to apply to the signal you connect to the counter source terminal. Scaled data that you read takes this setting into account. You should use a prescaler only when you connect an external signal to the counter source terminal and when that signal has a higher frequency than the fastest onboard timebase. Setting this value disables duplicate count prevention unless you explicitly set DuplicateCountPrevention to .
	PulseFrequencyDigitalFilterEnable	Specifies whether to apply a digital filter to the signal to measure.
	PulseFrequencyDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the filter recognizes.
	PulseFrequencyDigitalFilterTimebaseRate	Specifies in hertz the rate of the digital filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	PulseFrequencyDigitalFilterTimebaseSource	Specifies the terminal of the signal to use as the timebase of the digital filter.
	PulseFrequencyDigitalSynchronizationEnable	Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
	PulseFrequencyLogicLevelBehavior	Specifies the logic level behavior on the count reset line.
	PulseFrequencyStartingEdge	Specifies on which edge of the input signal to begin pulse measurement.
	PulseFrequencyTerminal	Specifies the input terminal of the signal to measure.
	PulseFrequencyTerminalConfiguration	Specifies the input terminal configuration.
	PulseFrequencyUnits	Specifies the units to use to return pulse specifications in terms of frequency.
	PulseTicksDigitalFilterEnable	Specifies whether to apply a digital filter to the signal to measure.
	PulseTicksDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the filter recognizes.
	PulseTicksDigitalFilterTimebaseRate	Specifies in hertz the rate of the digital filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	PulseTicksDigitalFilterTimebaseSource	Specifies the terminal of the signal to use as the timebase of the digital filter.
	PulseTicksDigitalSynchronizationEnable	Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
	PulseTicksLogicLevelBehavior	Specifies the logic level behavior on the count reset line.
	PulseTicksStartingEdge	Specifies on which edge of the input signal to begin pulse measurement.
	PulseTicksTerminal	Specifies the input terminal of the signal to measure.
	PulseTicksTerminalConfiguration	Specifies the input terminal configuration.
	PulseTimeDigitalFilterEnable	Specifies whether to apply a digital filter to the signal to measure.
	PulseTimeDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the filter recognizes.
	PulseTimeDigitalFilterTimebaseRate	Specifies in hertz the rate of the digital filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	PulseTimeDigitalFilterTimebaseSource	Specifies the terminal of the signal to use as the timebase of the digital filter.
	PulseTimeDigitalSynchronizationEnable	Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
	PulseTimeLogicLevelBehavior	Specifies the logic level behavior on the count reset line.
	PulseTimeStartingEdge	Specifies on which edge of the input signal to begin pulse measurement.
	PulseTimeTerminal	Specifies the input terminal of the signal to measure.
	PulseTimeTerminalConfiguration	Specifies the input terminal configuration.
	PulseTimeUnits	Specifies the units to use to return pulse specifications in terms of high time and low time.
	PulseWidthDigitalFilterEnable	Specifies whether to apply the pulse width filter to the signal.
	PulseWidthDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the filter recognizes.
	PulseWidthDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	PulseWidthDigitalFilterTimebaseSource	Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
	PulseWidthDigitalSynchronizationEnable	Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
	PulseWidthLogicLevelBehavior	Specifies the logic level behavior on the input line.
	PulseWidthStartingEdge	Specifies on which edge of the input signal to begin each pulse width measurement.
	PulseWidthTerminal	Specifies the input terminal of the signal to measure.
	PulseWidthTerminalConfiguration	Specifies the input terminal configuration.
	PulseWidthUnits	Specifies the units to use to return pulse width measurements.
	SampleClockOverrunBehavior	Specifies the counter behavior when data is read but a new value was not detected during a sample clock.
	SampleClockOverrunSentinelValue	Specifies the sentinel value returned when the No New Sample Behavior is set to Sentinel Value.
	SemiPeriodDigitalFilterEnable	Specifies whether to apply the pulse width filter to the signal.
	SemiPeriodDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the filter recognizes.
	SemiPeriodDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	SemiPeriodDigitalFilterTimebaseSource	Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
	SemiPeriodDigitalSynchronizationEnable	Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
	SemiPeriodLogicLevelBehavior	Specifies the logic level behavior on the count reset line.
	SemiPeriodStartingEdge	Specifies on which edge of the input signal to begin semi-period measurement. Semi-period measurements alternate between high time and low time, starting on this edge.
	SemiPeriodTerminal	Specifies the input terminal of the signal to measure.
	SemiPeriodTerminalConfiguration	Specifies the input terminal configuration.
	SemiPeriodUnits	Specifies the units to use to return semi-period measurements.
	SynchronizationUnlockBehavior	Specifies the action to take if the target loses its synchronization to the grand master. (Inherited from Channel.)
	TerminalCountReached	Indicates whether the counter rolled over. When you query this property, NI-DAQmx resets it to .
	TimestampInitialSeconds	Specifies the number of seconds that elapsed since the beginning of the current year. This value is ignored if GpsSyncMethod is IrigB.
	TimestampUnits	Specifies the units to use to return timestamp measurements.
	TwoEdgeSeparationFirstEdge	Specifies on which edge of the first signal to start each measurement.
	TwoEdgeSeparationFirstEdgeDigitalFilterEnable	Specifies whether to apply the pulse width filter to the signal.
	TwoEdgeSeparationFirstEdgeDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the filter recognizes.
	TwoEdgeSeparationFirstEdgeDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	TwoEdgeSeparationFirstEdgeDigitalFilterTimebaseSource	Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
	TwoEdgeSeparationFirstEdgeDigitalSynchronizationEnable	Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
	TwoEdgeSeparationFirstLogicLevelBehavior	Specifies the logic level behavior on the input line.
	TwoEdgeSeparationFirstTerminal	Specifies the source terminal of the digital signal that starts each measurement.
	TwoEdgeSeparationFirstTerminalConfiguration	Specifies the input terminal configuration.
	TwoEdgeSeparationSecondEdge	Specifies on which edge of the second signal to stop each measurement.
	TwoEdgeSeparationSecondEdgeDigitalFilterEnable	Specifies whether to apply the pulse width filter to the signal.
	TwoEdgeSeparationSecondEdgeDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the filter recognizes.
	TwoEdgeSeparationSecondEdgeDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	TwoEdgeSeparationSecondEdgeDigitalFilterTimebaseSource	Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
	TwoEdgeSeparationSecondEdgeDigitalSynchronizationEnable	Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
	TwoEdgeSeparationSecondLogicLevelBehavior	Specifies the logic level behavior on the count reset line.
	TwoEdgeSeparationSecondTerminal	Specifies the source terminal of the digital signal that stops each measurement.
	TwoEdgeSeparationSecondTerminalConfiguration	Specifies the input terminal configuration.
	TwoEdgeSeparationUnits	Specifies the units to use to return two-edge separation measurements from the channel.
	Type	Indicates the type of the virtual channel. (Inherited from Channel.)
	UsbTransferRequestCount	Specifies the maximum number of simultaneous USB transfers used to stream data. Modify this value to affect performance under different combinations of operating system and device.
	UsbTransferRequestSize	Specifies the maximum size of a USB transfer request in bytes. Modify this value to affect performance under different combinations of operating system and device.
	VelocityAInputDigitalFilterEnable	Specifies whether to apply the pulse width filter to the signal.
	VelocityAInputDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the digital filter recognizes.
	VelocityAInputDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	VelocityAInputDigitalFilterTimebaseSource	Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
	VelocityAInputLogicLevelBehavior	Specifies the logic level behavior of the input terminal.
	VelocityAInputTerminal	Specifies the terminal to which signal A is connected.
	VelocityAInputTerminalConfiguration	Specifies the input terminal configuration.
	VelocityAngularEncoderPulsesPerRevolution	Specifies the number of pulses the encoder generates per revolution. This value is the number of pulses on either signal A or signal B, not the total number of pulses on both signal A and signal B.
	VelocityAngularEncoderUnits	Specifies the units to use to return angular velocity counter measurements.
	VelocityBInputDigitalFilterEnable	Specifies whether to apply the pulse width filter to the signal.
	VelocityBInputDigitalFilterMinimumPulseWidth	Specifies in seconds the minimum pulse width the digital filter recognizes.
	VelocityBInputDigitalFilterTimebaseRate	Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
	VelocityBInputDigitalFilterTimebaseSource	Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
	VelocityBInputLogicLevelBehavior	Specifies the logic level behavior of the input terminal.
	VelocityBInputTerminal	Specifies the terminal to which signal B is connected.
	VelocityBInputTerminalConfiguration	Specifies the input terminal configuration.
	VelocityDecodingType	Specifies how to count and interpret the pulses the encoder generates on signal A and signal B. X1, X2, and X4 are valid for quadrature encoders only. Two Pulse Counting is valid for two-pulse encoders only.
	VelocityDivisor	Specifies the value by which to divide the input signal.
	VelocityLinearEncoderDistancePerPulse	Specifies the distance to measure for each pulse the encoder generates on signal A or signal B. This value is in the units you specify in CI.Velocity.LinEncoder.DistUnits.
	VelocityLinearEncoderUnits	Specifies the units to use to return linear encoder velocity measurements from the channel.
	VelocityMeasurementTime	Specifies in seconds the length of time to measure the velocity of the signal.
	VirtualName	Gets the name of the virtual channel. (Inherited from Channel.)
	VoltageThresholdLevel	Specifies the digital threshold value in Volts for high and low input transitions. Some devices do not support this for differential channels.

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Methods

	Name	Description
	CreateObjRef	Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object. (Inherited from MarshalByRefObject.)
	Dispose	Releases all resources used by Channel. (Inherited from Channel.)
	Dispose(Boolean)	Releases the managed and unmanaged resources used by Channel or optionally releases only the unmanaged resources. (Inherited from Channel.)
	Equals	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetLifetimeService	Retrieves the current lifetime service object that controls the lifetime policy for this instance. (Inherited from MarshalByRefObject.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	InitializeLifetimeService	Obtains a lifetime service object to control the lifetime policy for this instance. (Inherited from MarshalByRefObject.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	MemberwiseClone(Boolean)	Creates a shallow copy of the current MarshalByRefObject object. (Inherited from MarshalByRefObject.)
	ToString	Returns a string representation of the object. (Inherited from Channel.)

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Remarks

Use the CIChannels property to create or access a counter/timer input channel. A CIChannel might contain more than one virtual channel because the CIChannel is defined by providing a valid NI-DAQmx channel string to the CIChannels indexer or to a CIChannelCollection create channel method. If you set a property on a CIChannel object that represents multiple channels, that property is set for all of the channels that the object represents.

Tip
Example applications are located in the Public Documents\National Instruments\NI-DAQ\Examples\DotNET4.x directory or in the Start menu at National InstrumentsNI-DAQmxNI-DAQmx Examples.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

NI-DAQmx .NET Framework 4.0 API Reference

Table of Contents

CIChannel Class

Inheritance Hierarchy

Syntax

Properties

Methods

Remarks

Thread Safety

See Also

Reference

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