NI-HSDIO Dynamic Generation and Acquisition Shipping Example Triggering Primary Software: LabVIEW Development Systems>>Full Development SystemPrimary Software Version: 8.0 Primary Software Fixed Version: N/A Secondary Software: Driver Software>>NI-HSDIO Hardware: Digital I/O (DIO)>>High-Speed
Problem: I am developing an application based upon the NI-HSDIO shipping example "Dynamic Generation and Acquisition-Source Synchronous.vi". In this example, the generation session is configured to export the Data Active Event to PFI 1 to serve as a start trigger for the acquisition session. The example indicates that the user must make an external connection from PFI 1 to PFI 2 so that the acquisition session can be configured for a start trigger from PFI 2. I would like to save a PFI line in my application; for what reason is the acquisition session not configured for a start trigger on the internal signal on PFI 1? Solution: The Data Active Event can be routed internally such that you can generate the signal on PFI 1 and acquire that signal on PFI 1 to save yourself a PFI line. However, if you are acquiring data based on the Data Active Event, the start trigger for the acquisition session will not be aligned with the data. The reason for this is that data on the PFI lines is wired internally and available immediately, but the data has to pass out the front connector through a cable and back into the device. Depending on system setup, routing the start trigger internally could cause data points to be read too early. Sending the Data Active Event through the same cables that data is being sent allows the two signals to have the same delay. Related Links: Attachments:
Report Date: 12/06/2006 Last Updated: 12/08/2006 Document ID: 445CAKHZ |
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