How Much Memory Does My CompactDAQ Module Have?

Updated Apr 17, 2018

Reported In

Hardware

  • cDAQ-9174
  • NI-9269

Issue Details

I am looking to buy CompactDAQ modules and I want to make sure they will have enough memory so that I do not run into buffer overflows. I cannot find anything about the module's buffer or FIFO. Does it have any memory?

Solution

Generally, CompactDAQ modules will not have on-board memory, because memory is handled by the CompactDAQ Chassis. For example, the NI CompactDAQ 9174 has a 127 sample Input Buffer, and a 8191 sample Output Buffer. 

If you are concerned about overflowing these buffers, but CompactDAQ Chassis also incorporate Direct Memory Access (DMA) where they access the memory of the computer they are connected to in order to expand the amount of memory available to avoid overflows.

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