12-20-2013 05:08 AM
Hi,
we have a multiple chassis setup (4 chassis) connected to the same RT Workstation.
I am trying to generate 3 square waves using buffered continuous generation on a 6723 PXI module on chassis 2 using a single task and I am trying to use a counter to measure frequency using ctr0 of another 6723 PXI module on chassis 1 using another task, I thus created 2 different custom devices for the purpose and when I run them separately they just run fine, while when I load both of them I get back "Error -200251: No DMA Channels Available"
Does anyone have a clue?
12-27-2013 07:46 AM
Hi Claudio
the PXI 6723 (Specifications) 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 KnowledgeBases "Configuring the Data Transfer Mechanism (Interrupts or DMA)".
Kind Regards,
Philipp K.
AE | NI Germany
01-13-2014 12:56 AM
shouldnt each module have 1? I am using 2 different 6723 on 2 different chassis connected to the same RT Workstation.