Use the DAQmx Timing properties to configure the sample timing and duration of a task.

Advanced:First Sample Clock Time:Offset
Specifies, in seconds, the offset to apply to the FirstSampClk.When value. This offset modifies when the first sample clock occurs and is used to account for known delays in the signal path.
Advanced:First Sample Clock Time:Timescale
Specifies the timescale to be used for the value of FirstSampClk.When .
Advanced:First Sample Clock Time:When
Specifies the time of the first sample clock pulse.
Advanced:First Sample Timestamp:Enable
Specifies whether to enable the first sample timestamp.
Advanced:First Sample Timestamp:Timescale
Specifies the timescale to be used for the first sample timestamp.
Advanced:First Sample Timestamp:Value
Indicates the timestamp of the first sample.
Advanced:Sample Timing Engine
Specifies which timing engine to use for the task.
Change Detection:Digital Input:Falling Edge Physical Channels
Specifies the names of the digital lines or ports on which to detect falling edges. The lines or ports must be used by virtual channels in the task. You also can specify a string that contains a list or range of digital lines or ports.
Change Detection:Digital Input:Rising Edge Physical Channels
Specifies the names of the digital lines or ports on which to detect rising edges. The lines or ports must be used by virtual channels in the task. You also can specify a string that contains a list or range of digital lines or ports.
Change Detection:Digital Input:Tristate
Specifies whether to tristate lines specified with ChangeDetect.DI.RisingEdgePhysicalChans and ChangeDetect.DI.FallingEdgePhysicalChans that are not in a virtual channel in the task. If you set this property to TRUE, NI-DAQmx tristates rising/falling edge lines that are not in a virtual channel in the task. If you set this property to FALSE, NI-DAQmx does not modify the configuration of rising/falling edge lines that are not in a virtual channel in the task, even if the lines were previously tristated. Set this property to FALSE to detect changes on lines in other tasks or to detect changes on output-only lines.
Handshake:Delay After Transfer
Specifies the number of seconds to wait after a handshake cycle before starting a new handshake cycle.
Handshake:Sample Input Data When
Specifies on which edge of the Handshake Trigger an input task latches the data from the peripheral device.
Handshake:Start Condition
Specifies the point in the handshake cycle that the device is in when the task starts.
Implicit:Underflow Behavior
Specifies the action to take when the onboard memory of the device becomes empty.
More:AI Convert:Active Devices
Specifies a subset of devices in the task to configure. NI-DAQmx configures all devices in the task if you do not set this property.
More:AI Convert:Active Edge
Specifies on which edge of the clock pulse an analog-to-digital conversion takes place.
More:AI Convert:Delay From Sample Clock:Delay
Specifies the amount of time to wait after receiving a Sample Clock edge before beginning to acquire the sample. This value is in the units you specify with DelayFromSampClk.DelayUnits .
More:AI Convert:Delay From Sample Clock:Delay Units
Specifies the units of DelayFromSampClk.Delay .
More:AI Convert:Digital Filter:Enable
Specifies whether to apply a digital filter to the AI Convert Clock.
More:AI Convert:Digital Filter:Minimum Pulse Width
Specifies in seconds the minimum pulse width the filter recognizes.
More:AI Convert:Digital Filter:Timebase:Rate
Specifies in hertz the rate of the digital filter timebase. NI-DAQmx uses this value to compute settings for the filter.
More:AI Convert:Digital Filter:Timebase:Source
Specifies the terminal of the signal to use as the timebase of the digital filter.
More:AI Convert:Digital Synchronization:Enable
Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
More:AI Convert:Maximum Rate
Indicates the maximum convert rate supported by the task, given the current devices and channel count.
More:AI Convert:Rate
Specifies in Hertz the rate at which to clock the analog-to-digital converter. This clock is specific to the analog input section of multiplexed devices .
More:AI Convert:Source
Specifies the terminal of the signal to use as the AI Convert Clock.
More:AI Convert:Timebase Divisor
Specifies the number of AI Convert Clock Timebase pulses needed to produce a single AI Convert Clock pulse.
More:AI Convert:Timebase:Source
Specifies the terminal of the signal to use as the AI Convert Clock Timebase.
More:Master Timebase:Rate
Specifies the rate of the Master Timebase.
More:Master Timebase:Source
Specifies the terminal of the signal to use as the Master Timebase. On an E Series device, you can choose only between the onboard 20MHz Timebase or the RTSI7 terminal.
More:Reference Clock:Rate
Specifies the frequency of the Reference Clock.
More:Reference Clock:Source
Specifies the terminal of the signal to use as the Reference Clock.
More:Synchronization Clock:Interval
Specifies the interval, in Sample Clock periods, between each internal Synchronization Clock pulse. NI-DAQmx uses this pulse for synchronization of triggers between multiple devices at different rates. Refer to device documentation for information about how to calculate this value.
More:Synchronization Pulse:Digital Edge:Source
Specifies the terminal of the signal to use as the synchronization pulse. The synchronization pulse resets the clock dividers and the ADCs/DACs on the device.
More:Synchronization Pulse:Minimum Delay To Start
Specifies in seconds the amount of time that elapses after the master device issues the synchronization pulse before the task starts.
More:Synchronization Pulse:Reset Delay
Specifies in seconds the amount of time to wait after the Synchronization Pulse before resetting the ADCs or DACs on the device. When synchronizing devices, query SyncPulse.ResetTime on all devices and note the largest reset time. Then, for each device, subtract the reset time from the largest reset time and set this property to the resulting value.
More:Synchronization Pulse:Reset Time
Indicates in seconds the amount of time required for the ADCs or DACs on the device to reset. When synchronizing devices, query this property on all devices and note the largest reset time. Then, for each device, subtract the value of this property from the largest reset time and set SyncPulse.ResetDelay to the resulting value.
More:Synchronization Pulse:Synchronization Time
Indicates in seconds the delay required to reset the ADCs/DACs after the device receives the synchronization pulse.
More:Synchronization Pulse:Terminal
Indicates the name of the internal Synchronization Pulse terminal for the task. This property does not return the name of the source terminal.
More:Synchronization Pulse:Time:Timescale
Specifies the timescale to be used for timestamps for a sync pulse.
More:Synchronization Pulse:Time:When
Specifies the start time of the sync pulse.
More:Synchronization Pulse:Type
Specifies the type of sync pulse used in the task.
On Demand:Simultaneous Analog Output Enable
Specifies whether to update all channels in the task simultaneously, rather than updating channels independently when you write a sample to that channel.
Sample Clock:Active Edge
Specifies on which edge of a clock pulse sampling takes place. This property is useful primarily when the signal you use as the Sample Clock is not a periodic clock.
Sample Clock:Digital Filter:Enable
Specifies whether to apply the pulse width filter to the signal.
Sample Clock:Digital Filter:Minimum Pulse Width
Specifies in seconds the minimum pulse width the filter recognizes.
Sample Clock:Digital Filter:Timebase:Rate
Specifies in hertz the rate of the pulse width filter timebase. NI-DAQmx uses this value to compute settings for the filter.
Sample Clock:Digital Filter:Timebase:Source
Specifies the input terminal of the signal to use as the timebase of the pulse width filter.
Sample Clock:Digital Synchronization:Enable
Specifies whether to synchronize recognition of transitions in the signal to the internal timebase of the device.
Sample Clock:Maximum Rate
Indicates the maximum Sample Clock rate supported by the task, based on other timing settings. For output tasks, the maximum Sample Clock rate is the maximum rate of the DAC. For input tasks, NI-DAQmx calculates the maximum sampling rate differently for multiplexed devices than simultaneous sampling devices .
Sample Clock:Overrun Behavior
Specifies the action to take if Sample Clock edges occur faster than the device can handle them.
Sample Clock:Rate
Specifies the sampling rate in samples per channel per second. If you use an external source for the Sample Clock, set this input to the maximum expected rate of that clock.
Sample Clock:Source
Specifies the terminal of the signal to use as the Sample Clock.
Sample Clock:Terminal
Indicates the name of the internal Sample Clock terminal for the task. This property does not return the name of the Sample Clock source terminal specified with SampClk.Src .
Sample Clock:Timebase Divisor
Specifies the number of Sample Clock Timebase pulses needed to produce a single Sample Clock pulse.
Sample Clock:Timebase:Active Edge
Specifies on which edge to recognize a Sample Clock Timebase pulse. This property is useful primarily when the signal you use as the Sample Clock Timebase is not a periodic clock.
Sample Clock:Timebase:Master Timebase Divisor
Specifies the number of pulses of the Master Timebase needed to produce a single pulse of the Sample Clock Timebase.
Sample Clock:Timebase:Rate
Specifies the rate of the Sample Clock Timebase. Some applications require that you specify a rate when you use any signal other than the onboard Sample Clock Timebase. NI-DAQmx requires this rate to calculate other timing parameters.
Sample Clock:Timebase:Source
Specifies the terminal of the signal to use as the Sample Clock Timebase.
Sample Clock:Timebase:Terminal
Indicates the name of the internal Sample Clock Timebase terminal for the task. This property does not return the name of the Sample Clock Timebase source terminal specified with SampClk.Timebase.Src .
Sample Clock:Underflow Behavior
Specifies the action to take when the onboard memory of the device becomes empty. In either case, the sample clock does not stop.
Sample Clock:Write Waveform:Use Initial Waveform dt
Specifies that the value of SampClk.Rate will be determined by the dt component of the initial DAQmx Write waveform input for Output tasks.
Sample Quantity:Sample Mode
Specifies if a task acquires or generates a finite number of samples or if it continuously acquires or generates samples.
Sample Quantity:Samples Per Channel
Specifies the number of samples to acquire or generate for each channel if SampQuant.SampMode is Finite Samples. If SampQuant.SampMode is Continuous Samples, NI-DAQmx uses this value to determine the buffer size .
Sample Timing Type
Specifies the type of sample timing to use for the task.

NI-DAQmx VI and Function Reference

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