Using the output with 6009 or 6216 possible buffer?
Hello
I have a USB6009 and a USB6216. I need to generate a signal by using the analog output and I would use the output buffer. My questions are:
-The USB6009 has an output buffer? I always get an error, but I know from experience that this device is very limited, so I wonder if they have not only an output buffer... (Programs in input buffer are not a problem at all).
-J' took the USB6216 and I tried the example WfmGenUp.c downloaded from somewhere in the area of the developer (sorry I lost the link but fix the code) but I am not all analog output signals and after you press ENTER to stop the program (depending on the show) I get this error message:
NO MORTALS RUN - TIME ERROR: 'WfmGenUp.c', line 113, col 9, id thread 0x0000088C: DAQmxStopTask function: (is-200016 return value [0xfffcf2b0]). Measurements: On-board memory precision passing. Due to the limitations of system and/or the bandwidth of the bus, the driver could not write data to the device fast enough to track the rate of output of the device. Reduce your sampling rate, change the method of transfer of data (from interruptions on DMA), use a product with more on-board memory or reduce the number of programs that your computer runs simultaneously. Task name: _unnamedTask<0> Code of State:-200016
I don't know if the problem is just that the 6216 does not support the output buffering or the other...
-So, if the output control is not supported by 6009 or 6216 what would be the best way to constantly generate signals to 100 s/s?
Thank you very much
Kristel
Hi Ryan,
the USB-6009 case has 150 s/s softwaretimed AO, so you won´t be able to use AO stamped with the module.
The USB-6216 supported in the analog output buffer, just follow the recommendations that the driver gives you,
for example by reducing the sampling frequency, if there is an overflow memory due to the limitations of system and/or the bandwidth of the bus.
Experiment with the parameters and the basic to see in what range of sampling it works.
You can find appropriate examples
ANSI C:
C:\Dokumente und All Anwendungsdaten Users\Dokumente\National Instruments\NI - DAQ\Beispiele\DAQmx C\Analog Out\Generate Voltage\Cont Gen Volt Wfm - Int Clk ANSI
LabWindows CVI:
C:\Dokumente und Users\Dokumente\National Instruments\CVI\samples\DAQmx\Analog Out\Generate Voltage\Cont Gen Volt Wfm - Int Clk Anwendungsdaten All
0>
Tags: NI Software
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