Failed to retrieve Counter measures series M USB input

I have an application where I need to measure any number of semi-periodes using a counter stain in the input on a USB M Series buffer (6221).  As the number of pulses is undetermined, I did the ongoing task (but a finished task with a buffer larger than the number of times my semi gives the same behavior).  I start the task of counter entry and then trigger an external pulse generator.  I'm getting a signal saying the external pulse generator is finished, and at this point, I know I can read back all the acquired samples.

I waited for that (for a small number of impulses) reading-1 simply give an empty array that my samples would have sat on a USB and DAQmx hardware FIFO would have no way to know about them (indeed, it is true).  However, it turns out that to read a finite number of samples not initiates transfer and instead results in a time-out (even with the time set to the default value of 10 seconds).  It seems that after DAQmx Read is called an additional impetus is needed to start the transfer of the buffer to the software (as if there was some kind of pipeline).  However, for this application to work I need to read after the last pulse was generated so I can measure all impulses.  Generate additional impetus after reading allows me to read my full buffer, but I can't afford to send an additional impetus (that would trigger my polymerization of power system pulsed) just to re-read my data.

Here's a simple reproduction VI:

I should also mention that the behavior is correct in USB x 621 (and so probably the X series as well).  In other words, reading a finite number of samples is initiating the transfer (no additional impetus is needed) so I can read 1 sample followed by-1 to get all my data.  Internal bus (PCI, PXI, PCIe, SMU) do not have the USB FIFO and so I'm not expecting to show the behavior either.  Reproduce, you would need to run it on a key USB 622 x 625 x or x 628.

If I make the finished task and provide the correct number of pulses it works (I can just read back the desired number of only one), but as I don't know how many pulses are generated to do the continuous task or end up with many more - in both cases, it seems impossible to get all of my data back.

Does anyone have a way to initiate the transfer of a task (not bus-powered) USB M Series semi period once the source of the signal ceased to produce pulses?  Hardware change (or alternatives such as the DI a timestamp change the task of detection) is not an option for me as we have several systems deployed to customers already and this input is wired for a PFI to a USB 6221 OEM line.  The Size property of ask Xfer USB does not seem to be supported on USB M Series for half tasks.  I also tried to interview samples available by channel (thinking maybe this could initiate a transfer) but it made no difference.

Best regards

Hello again John!  Of course, push you our products on the cutting edge!

Unfortunately, in this case, this is the expected behavior.  Signals Streaming technology of NOR allows we to the bus package based such as USB, Ethernet and wireless applications to high bandwidth everywhere.  Unfortunately, our first generation data acquisition products to use signals Streaming technology of OR were based on the ASIC STC2 which was not designed originally with Streaming of signals OR to mind.  Counters, in particular, are a special cirumstance where it's particularly weird.  When you call DAQmx Read, we usually indicate to the device to send through all the necessary data that you request instead of create a maximum of size package for the best use of USB bandwidth.  In the meter case, however, actually required the aircraft to send a sample of more than what you actually want.  The reason for this is that we must manually check for error on the subsystem of meter conditions until we send you all data which may not be valid.  Because of this, we inject an additional step in the chain of events before that data is sent across the bus to ensure that, in fact, the data we send is valid.  This requires us to acquire a sample of data that we expect to kick indicating error conditions that could occur from the subsystem.

As you have noticed, this is should be a question on the USB M Series devices for.  Powered by bus of devices USB M Series (USB-621 x), X series (USB-63xx) and all the features of the plugin should not have this problem.

Tags: NI Hardware

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