Error -200251: "No DMA Channels Available" When Using Multiple CountersHardware: PXI/CompactPCI>>Controllers
Problem: I am doing more than three simultaneous counter input tasks on a NI 6602 or NI 6608, or I am doing more than one simultaneous counter input task on a PCI-6601. After adding an additional task and running, the following error occurs at DAQmx Start Task. Error -200251 Measurements: No DMA channels or USB Bulk Endpoints are available. How do I resolve this? Solution: The PXI-6602 and PXI-6608 have 3 DMA channels and the PCI-6601 has 1 DMA channel. Any additional operations, including counter inputs, must be interrupt-based and cannot use DMA. For instructions on configuring the particular task to use interrupts, see KnowledgeBase 34FGAFVM: Configuring the Data Transfer Mechanism (Interrupts or DMA) in DAQmx and Traditional DAQ. Related Links: KnowledgeBase 34FGAFVM: Configuring the Data Transfer Mechanism (Interrupts or DMA) in DAQmx and Traditional DAQ Attachments:
Report Date: 11/01/2006 Last Updated: 02/19/2009 Document ID: 430FRH7E |
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