Trigger break and T0

I have a map of PXI - 6281 M series and tries to use a pause trigger door acquisition and synchronize two 6281 cards.

If the door is activated after start of the task, the T0 the output waveform is based on the task start time.  Breaks in acquisition lead no gap in the output waveform.

I do not plan to have a break in the middle of the acquisition, but the T0 start must be based on the leading edge of the break.  Not the task start VI call.

Is there a way to do this?

Thank you

XL600

I think I've answered my own question...

T0 is locked on the first call to the read DAQmx VI where the data are available and has nothing to do with the early or interromptre.  This is described in terms clear here.  T0 is generated by the driver, not the card for the M Series DAQ cards.

What I used to minimize the delay is an edge detect calendar source connected to my trigger for acquisition (which is used to control the start-up or interromptre).  I ran in a loop timed and used the global time in the form of stamp from the 'edge '.  I also sent a notifier for awhile waiting for loop and captured the first T0.  They are less than 1 sample clock rate multiple between 1 Hz and 10 kHz.  I'm sure there will be some jitter in T0 based on LabView RT priorities, but I am happy that the technique works well.

An interesting side effect is that T0 the newspaper of TDMS is also hooked the first reading in the newspaper and reading mode (not tried to connect only... could be interesting to know that behavior).

Thanks for the comments,

XL600

Tags: NI Software

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