DAQ collecting finite samples despite being set to continuous acquisition mode

Hello,
I've created a vi which reads data from one channel on my USB 6225 OEM device, displays the data to a chart, and writes the data to a .csv file using the write to spreadsheet file vi. The DAQ acquisition mode is set to Continuous Samples; however it behaves as if it were set to N Samples, as the number of data points written to my .csv file is equal to the number specified in the Samples to Read input.
I replaced the DAQmx Assistant vi with the Simulate Signal vi and observed the same behavior. Why does this happen?
Attached below is my vi.
Attachments:
chart time.vi ‏78 KB

When the acquisition mode is set to continuous samples, the samples to read input becomes the buffer size -- not the number of samples read. I expect the DAQ to collect samples until I stop the vi. This is the behavior I have always seen in the past, so don't know why it is any different this time.

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DAQ collecting finite samples despite being set to continuous acquisition mode

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