I want to read 0 count in buffered event counting mode

[alegrecd]

Hi, I am using the NI6602 board with DAQmx ANSI C. My aplication uses six counters in buffered event counting mode, 0 events is a valid value for me, but when the gate signal arrives the 0 value isn't written to the buffer. Instead the function DAQmxCreateLinScale() returns a timeout error. How can I solve it?

Thanks.

[alegrecd]

Sorry, the function that returns with a timeout error is DAQmxReadCounterU32()

[Kevin_Price]

alegrecd,
I'm afraid I don't know the syntax for doing this from C with explicit DAQmx calls. But I think you need to look into turning ON the property called "duplicate count prevention." The name isn't the most descriptive of the actual behavior.

Normally the property is OFF. In such case, the counter expects the Source signal (which increments the internal count register) to be faster than the Gate (or "sampling clock") signal. If no Source edges are seen between successive Gate edges, the count value is NOT put into the data acq buffer.

If you turn the property ON, then the count values WILL be written to the buffer, even if no source edges have occurred between successive Gate edges.

-Kevin P.

[alegrecd]

Kevin P.
Thank you for your answer. I found the DAQmx C function that change this property. The function is DAQmxSetCIDupCountPrevent(TaskHandle taskHandle, const char channel[], bool32 data);

Thanks,

alegrecd