On a NOR-6363: how many digital samples can be acquired at once?

Hello

I use a NOR-6363 with meter 3 configured for pulse generation finished.

I created a digital input channel to acquire digital values (on P0.16 and P0.17) with counter3 as the sample clock.

The idea is to acquire a finite number of digital samples (even as the number of finished pulses generated on counter3).

Currently, I'm trying to figure out if I can get about 1000 samples (requirement of my request).

The data sheet indicates that the FIFO size for a digital input is 255. Is this to say that I can not acquire more than 255 samples at a time?

I tried to use high values up to 1000 but no error occurs.

Is this to say that the reading of values will be correct?

Or im guessing it might be a circular FIFO that overlooks the same values reading values of more than 255.

Should I worry about this limit of 255 at all?

Thank you

Since no one answered this yet and I posted my question there are times, I'll take a stab at a helping hand.

The FIFO on the digital input is the place on board where the samples will be kept until their transfer on the bus in the RAM. So, the question becomes what controls when these samples are pushed to the RAM. If I remember correctly, this card has 8 DMA 1 channel who will control when these samples are transferred on the bus. I don't think there is a way to control when the DMA channel completes his transfer, but the first transfer is likely before you fill up the first 255 samples. DMA transfers will continue to occur until all samples have been transferred to the PC RAM.

Once some or all samples have been transferred to the bus and reside on PC RAM, you call then call DAQmx read. Then, the samples are in your Application development environment (ADE) RAM, if you use them in your program. You have 3 separate storage locations: FIFO on board, PC memory, memory of the ADE.

You shouldn't have to worry about the limit of 255. Maybe if you were doing a very fast acquisition, this could be a factor...

Kind regards
Eric

Tags: NI Hardware

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