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 |
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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. |
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| 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.
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| 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. |