DAQmxCfgAnlgWindowRefTrig

int32 DAQmxCfgAnlgWindowRefTrig (TaskHandle taskHandle, const char triggerSource[], int32 triggerWhen, float64 windowTop, float64 windowBottom, uInt32 pretriggerSamples);

Purpose

Configures the task to stop the acquisition when the device acquires all pretrigger samples, an analog signal enters or leaves a range you specify, and the device acquires all post-trigger samples.

Parameters

Input
Name	Type	Description
taskHandle	TaskHandle	The task used in this function.
triggerSource	const char []	The name of a virtual channel or terminal where there is an analog signal to use as the source of the trigger. For E Series devices, if you use a virtual channel, it must be the only channel in the task. The only terminal you can use for E Series devices is PFI0.
triggerWhen	int32	Specifies whether the Reference Trigger occurs when the signal enters the window or when it leaves the window. Use windowBottom and windowTop to specify the limits of the window. Value Description DAQmx_Val_EnteringWin Trigger when the signal enters the window. DAQmx_Val_LeavingWin Trigger when the signal leaves the window.
windowTop	float64	The upper limit of the window. Specify this value in the units of the measurement or generation.
windowBottom	float64	The lower limit of the window. Specify this value in the units of the measurement or generation.
pretriggerSamples	uInt32	The minimum number of samples per channel to acquire before recognizing the Reference Trigger. The number of posttrigger samples per channel is equal to number of samples per channel in the NI-DAQmx Timing functions minus pretriggerSamples.

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.