National Instruments NI Vision NI 17xx User Manual

Also see for NI Vision NI 17 Series: User manual User manual

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National Instruments NI Vision NI 17xx User Manual Manual pdf 42 page image

Chapter 5 Image Acquisition© National Instruments Corporation 5-3 NI 17xx Smart Camera User ManualIn fixed-frame-rate mode, you can specify a frame rate that is less than orequal to the maximum frame rate by setting the Frame Rate property inLabVIEW. Setting the Frame Rate property will implicitly take you out offree-run mode and into fixed-frame-rate mode. To return to free-run mode,set the Fixed-Frame-Rate Mode property in LabVIEW to FALSE.Note Vision Builder AI and MAX do not support fixed-frame-rate mode.External TriggerUse the trigger input to synchronize the NI Smart Camera with an externalevent, such as the assertion of a signal generated by a proximity sensor.You can trigger the smart camera at rates up the maximum frame rate.Refer to the Maximum Frame Rate section for information about factorsthat affect the maximum frame rate.To use an external trigger, the trigger signal must be provided on theTrigIn/IsoIn(0)+ and TrigIn/IsoIn(0)– inputs to the camera and triggeringmust be enabled in the software. Refer to the Isolated Inputs section ofChapter 2, Power and I/O, for information about connecting externalsignals.You can enable triggering in the following software programs:• Vision Builder AI—Select the Triggered Acquisition checkbox onthe Trigger tab of the Acquire Image (Smart Camera) step.• LabVIEW—Use the IMAQ Configure Trigger 3 VI.• MAX—Select the Enable Trigger checkbox on the Triggering tab ofthe smart camera configuration page.