Hello,
This depends on whether you are performing a single-buffered or double-buffered acquisition.
In a single-buffered acquisition, the "count" corresponds to the number of samples the DAQ device acquires and is an unsigned 32-bit value. The largest number that this number can represent is (2^32)-1.
In a double-buffered acquisition, the "count" corresponds to the size (in number of samples) of buffer that fills up in a circular fashion. It must be an even number. The range of this value depends on the DAQ device you are using and can be referenced by the chart located in the NI-DAQ Function Reference Help file. To access this file, go to your desktop and click [Start]>>[Programs]>>[National Instruments]>>[NI-DAQ]>>[Traditional NI-DAQ Function Reference
Help]. Then, search for "DAQ_Start" without the quotations.
I hope this helps clear up any confusion. Please let me know if you need any further assistance. Have a great day!
Regards,
Joe Des Rosier
National Instruments
