How can I set the SRQ bit on GPIB with LabView ?

Hello,
I am developping an application with LabView RT on a PXI RT system. This application acts as an instrument (non controller GPIB), and I need to assert the SRQ line. How can I do that ?
I know the ibrsv function, but I can't find it in LabView, and I can not use it through a DLL call since GPIB DLLs are not compatible with Real-Time.
Thank you.

Hello Alfonso,
It sounds like you might be getting errors -200279 and -200278.  (In the future, if you post the actual error codes, it helps us to know exactly what is happening).  Error -200279 happens when you are performing a hardware-timed acquisition (meaning the data is sampled according to a clock signal on your board), but your LabVIEW program is not reading the values from the buffer allocated for that task in computer memory fast enough.  Basically it's a buffer overflow error.  It means older samples have been overwritten before you attempted to read them out.  As the error message suggests, "increasing the buffer size, reading the data more frequently, or specifying a fixed number of samples to read instead of reading all available samples might correct the problem."  For more information on this error, please see the KB (DAQmx) Error -200279 During a Continuous, Buffered Acquisition.
Error -200278 happens most often when you have configured a finite acquisition, but are calling the DAQmx Read function in a loop.  If you want to perform a finite acquisition, you should only call DAQmx Read once.  For more information on this error, see the KB Error -200278 at DAQmx Read.
Finally, please refer to Abhinav's earlier post about the sample rate on the 9237 module.  As he described, the NI-DAQmx 8.3 driver will only allow you to set the sample clock to integer divisions of 50k (50,000/n, where n can be 1, 2, 3...13).  Since the maximum divisor is 13, the smallest sample rate that can be used is 3.846 kS/s.  You can check what value the driver is actually using for the sample clock by reading from the SampClk.Rate property of the DAQmx Timing property node.
I hope this helps!  Let me know if you have any questions about what I've described.
Best regards,

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