Hardware Red LED When Using External Clock Hardware: Digital I/O (DIO)>>High-Speed>>PCI-6552, Digital I/O (DIO)>>High-Speed>>PXI-6562, Digital I/O (DIO)>>High-Speed>>PXI-6542, Digital I/O (DIO)>>High-Speed>>PCI-6551, Digital I/O (DIO)>>High-Speed>>PCI-6542, Digital I/O (DIO)>>High-Speed>>PXI-6561, Digital I/O (DIO)>>High-Speed>>PXI-6541, Digital I/O (DIO)>>High-Speed>>PCI-6541, Digital I/O (DIO)>>High-Speed>>PCI-6561, Digital I/O (DIO)>>High-Speed>>PXI-6552, Digital I/O (DIO)>>High-Speed>>PCI-6562
Problem: I am using one of the NI-HSDIO cards (654x, 655x or 656x) with an external clock. Even if I stop the external clock after my acquisition/generation, the front panel red LED lights up and I cannot make it go away. Why is this LED turning on and how can I fix this? Solution: The NI-HSDIO cards (654x, 655x and 656x) require a continuous free running external clock. There are internal Phase Locked Loops (PLL) that will lock onto this frequency and will give an error (LED lights red) if the clock is stopped (even after the acquisition/generation). For this reason, your program should completely reset the device so the PLLs will unlock without error. Use the VI called "niHSDIO Reset Device" or the function "niHSDIO_ResetDevice" to perform this action. Note: The VI "niHSDIO reset" or function "niHSDIO_reset" will not unlock the PLLs. Related Links: Knowledge Base 41SI2DJQ: External Clocking for HSDIO Devices niHSDIO Product Page Attachments:
Report Date: 07/26/2007 Last Updated: 07/26/2007 Document ID: 4BP6HQJX |
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