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NI-DAQmx Base 3.x C Function Reference Help
Conventions
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Key Concepts
Clocks
Terminal Names
Task Configuration/Control
DAQmxBaseClearTask
DAQmxBaseCreateTask
DAQmxBaseIsTaskDone
DAQmxBaseLoadTask
DAQmxBaseResetDevice
DAQmxBaseStartTask
DAQmxBaseStopTask
Channel Configuration/Creation
Create Analog Input Channels
DAQmxBaseCreateAIThrmcplChan
DAQmxBaseCreateAIVoltageChan
Create Analog Output Channel
DAQmxBaseCreateAOVoltageChan
Create Digital Input Channels
DAQmxBaseCreateDIChan
Create Digital Output Channels
DAQmxBaseCreateDOChan
Create Counter Input Channels
DAQmxBaseCreateCIPeriodChan
DAQmxBaseCreateCICountEdgesChan
DAQmxBaseCreateCIPulseWidthChan
Position
DAQmxBaseCreateCILinEncoderChan
DAQmxBaseCreateCIAngEncoderChan
Create Counter Output Channels
DAQmxBaseCreateCOPulseChanFreq
Timing
DAQmxBaseCfgSampClkTiming
DAQmxBaseCfgImplicitTiming
Triggering
Start Trigger
DAQmxBaseDisableStartTrig
DAQmxBaseCfgDigEdgeStartTrig
DAQmxBaseCfgAnlgEdgeStartTrig
Reference Trigger
DAQmxBaseCfgAnlgEdgeRefTrig
DAQmxBaseCfgDigEdgeRefTrig
DAQmxBaseDisableRefTrig
Read Functions
DAQmxBaseReadAnalogF64
DAQmxBaseReadBinaryI16
DAQmxBaseReadCounterF64
DAQmxBaseReadCounterScalarF64
DAQmxBaseReadCounterScalarU32
DAQmxBaseReadCounterU32
DAQmxBaseReadDigitalScalarU32
DAQmxBaseReadDigitalU32
DAQmxBaseReadDigitalU8
Write Functions
DAQmxBaseWriteAnalogF64
DAQmxBaseWriteDigitalU8
DAQmxBaseWriteDigitalU32
DAQmxBaseWriteDigitalScalarU32
Export HW Signals
DAQmxBaseExportSignal
Internal Buffer Configuration
DAQmxBaseCfgInputBuffer
Error Handling
DAQmxBaseGetExtendedErrorInfo
Glossary
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WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS
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DAQmxBaseCfgAnlgEdgeStartTrig

int32 DAQmxBaseCfgAnlgEdgeStartTrig (TaskHandle taskHandle, const char triggerSource[ ], int32 triggerSlope, float64 triggerLevel);

Purpose

Configures the task to start acquiring samples when an analog signal crosses the level you specify.

Parameters

Input
Name Type Description
taskHandle TaskHandle The task used in this function.
triggerSource const char [ ] The name of a terminal where there is an analog signal to use as the source of the trigger such as the following: /Dev1/PFI0. The only terminal you can use for E Series devices is PFI0.
triggerSlope int32 Specifies on which slope of the signal to start acquiring samples when the signal crosses triggerLevel.
Value Description
DAQmx_Val_RisingSlope Trigger on the rising slope of the signal.
DAQmx_Val_FallingSlope Trigger on the falling slope of the signal.
triggerLevel float64 The threshold at which to start acquiring samples. Specify this value in the units of the measurement. Use triggerSlope to specify on which slope to trigger at this threshold.

Return Value

Name Type Description
status int32 The error code returned by the function in the event of an error or warning. A value of 0 indicates success. A positive value indicates a warning. A negative value indicates an error.
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