National Instruments 6711 User Manual

Also see for DAQCard-6715: User manual User manual

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National Instruments 6711 User Manual Manual pdf 35 page image

© National Instruments | 3-7TitleShort-Hidden (cross reference text)Using a Digital SourceTo use ao/Pause Trigger, specify a source and a polarity. The source can be an external signalconnected to any PFI or RTSI <0..6> pin. The source can also be one of several other internalsignals on your DAQ device. Refer to Device Routing in MAX in the NI-DAQmx Help or theLabVIEW Help for more information.Also, specify whether the samples are paused when ao/PauseTrigger is at a logic high or lowlevel.AO Sample Clock SignalYou can use the AO Sample Clock (ao/SampleClock) signal to initiate AO samples. Eachsample updates the outputs of all of the DACs.The source of the ao/SampleClock signal can be internal or external. You can specify whetherthe DAC update begins on the rising edge or falling edge of the ao/SampleClock signal.Using an Internal SourceBy default, ao/SampleClock is created internally by dividing down theao/SampleClockTimebase. For more information, refer to the AO Sample Clock TimebaseSignal section.Several other internal signals can be routed to the sample clock. Refer to Device Routing in MAXin the NI-DAQmx Help or the LabVIEW Help for more information.Using an External SourceYou can use a signal connected to any PFI or RTSI <0..6> pin as the source of ao/SampleClock.Figure 3-6 shows the timing requirements of the ao/SampleClock source.Figure 3-6. ao/SampleClock Timing RequirementsRising-EdgePolarityFalling-EdgePolarityt w = 10 ns minimumt w