Controls/Indicators for Analog, Digital, and Camera Link Devices
In the Select Controls/Indicators step of the NI Vision Acquisition Express Wizard, specify the controls and indicators that will be available on the Express VI based on the type of device used.
Controls
If you are using an Analog, Digital or Camera Link device, the following controls may be available based on your acquisition settings:
| Control | Description |
|---|---|
| Stop (F) | Stops the acquisition. This is a required control when performing a continuous acquisition. |
| Number of Image Buffers | Specifies the number of internal buffers into which image data will be acquired. This is an optional Setup Settings control that only applies the first time the VI is called. |
| Number of Post Trigger Buffers | Indicates the number of images acquired after the Stop Trigger occurs. This control is available when End of Acquisition is selected as a trigger action. This is an optional Setup Settings control that only applies the first time the VI is called. |
| Pulse Delay | Allows you to set the desired duration of the first phase of the signal in timebase units. This control is available when a pulse is selected as a digital output. This is an optional Setup Settings control that only applies the first time the VI is called. |
| Pulse Width | Allows you to set the desired duration of the second phase of the signal in timebase units. This is an optional Setup Settings control that only applies the first time the VI is called. |
| Bayer Settings | Sets the Bayer decoder pattern used to decode the image. This control is available when Perform Bayer Decoding is selected. The Pattern, Red Gain, Green Gain, and Blue Gain can be adjusted. This is a Setup Settings control that only applies the first time the VI is called. |
| Drive Signal | Allows you to select what signal to drive. This control is available when a Drive Status Signal is selected as a digital output. This is an optional Acquire Settings control that is applied every time the Express VI is called. |
| Drive Polarity | Allows you to select the polarity of the signal to drive. This control is available when Drive Status Signal is selected as a digital output. This is an optional Acquire Settings control that is applied every time the Express VI is called. |
Indicators
If you are using an Analog, Digital or Camera Link device, the following indicators may be available based on your acquisition settings:
| Indicator | Description | ||
|---|---|---|---|
| All Image Buffers Out | An array of images allocated by the VI that you can dispose of when the images are no longer in use. This indicator is available when Continuous Acquisition with Acquire Every Image or Finite Acquisition with Inline Processing is selected as the acquisition type. This is a required indicator. | ||
| Stopped | This indicator is used to stop a continuous acquisition. It is only available when you are doing a continuous acquisition. This is a required indicator. | ||
| Image Out | The reference to the acquired image. This is a required indicator. | ||
| Image Number | 0-based indicator of how many images have been acquired. This is an optional indicator. | ||
| Total Images Transferred | 1-based indicator of the total number of images acquired since the beginning of the acquisition. This is an optional indicator. | ||
| Lost Image Count | Returns the total number of lost frames in a continuous acquisition. The value increments by 1 each time images are lost. This is an optional indicator. | ||
| Frame Rate | The rate of images acquired in frames per second. This is an optional indicator. | ||
| Raw Bayer Image Out | This indicator is available when Perform Bayer Decoding is selected. This is an optional indicator. | ||
| Image Height | The number of lines acquired per image. This indicator is available when Trigger Height of Acquisition is selected as a trigger action. This is an optional indicator. | ||
| Pre Trigger Images | This indicator is available if Trigger End of Acquisition is selected as a trigger action. This is an optional indicator. | ||
| Post Trigger Images | This indicator is available if Trigger End of Acquisition is selected as a trigger action. This is an optional indicator. | ||
| Encoder Count | Only applies when Use Encoder Settings is selected as a configuration setting. This is an optional indicator.
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