Restarting analogue output when DAQmxWriteAnalogF64 returns an error

[greenstuff]

I am using LabWindows/CVI to output analogue voltages on a PXI 6723.  My software works well until I try to write a value that is outside of the range the scale for that channel can handle.  The call to DAQmxWriteAnalogF64 rightfully returns error -200561 ("Attempted writing analog data that is too large or too small").  However following this, when I try to write in-range values, DAQmxWriteAnalogF64 returns -200293 ("The generation is not yet started, and not enough space is available in the buffer. Configure a larger buffer, or start the generation before writing more data than will fit in the buffer").  What is the cause of this?

Thanks

Martin

[JÞB · Accepted solution]

When the first error occurs the task stops and will not restart until everything gets better.  If you are calling DAQmx Write with Autostart T you need to stop and start the task expressly after this error to clear the "bad value"

[greenstuff]

Thanks Jeff, much appreciated.