memory pxi-6561

[Timothy 123]

Hi,

Is there a way I can check how much memory is remaining on a channel of the pxi-6561 while I am aquiring data.

Thank you,

-Tim

[Timothy 123]

Hi,

Does this give the number of data points remaining in the memory for
all channels or just for the number of channels selected. Also why is
this output a signed integer instead of an unsigned integer? Is there a
way to determine the amount of memory left on a channel by channel
basis. What I would like to do, is know how much onboard memory I have
while I am aquiring data so I can decide whether or not to continue
acquiring data or if it is time to fetch data.

One more question. I am looking at the Dynamic Generation and
Generation-Source Synchronous.vi Example. Here the acquisition session
is started by a trigger from PFI-2 that is routed from PFI-1 when there
is a data active event. If I want to save my PFI channels and not use
any extra outside wires. Can I generate this trigger on PFI-1 and
acquire it on PFI-1. I am sort of confused by the documentation in the
help file that says channels can simultaneously be configured for both
dynamic generation and dynamic acquisition. Does this mean they can
appear at the same time or one appears followed by another. or does the
device have a way of recognizing which data is coming out and which is
coming in.  This is stated in the Programming Flow section of the
help file for digital waveform analyzers and generators. I have a
pxi-6561 by the way.

Thank you,

-Tim

[Timothy 123]

Sorry,

I think the earlier message might have been unclear, but what I meant
to say is that if I just specify an arbitrary number of samples to
acquire, will the acquisition just stop even before the specified
number of samples is not reached, so that I could trick the device into
starting and stopping based on triggers instead of stopping after a
finite number of samples.

Thank you,

-Tim

[Timothy 123]

Hi,

When I am aquiring data, do I have to specify the number of samples
that I am acquiring. For example if I wish to start acquiring data
based on a data active event and then stop acquiring the data based on
an external trigger, can I specify the number of samples to acquire to
be an arbitrary number and then the acquisition of data will stop once
the external trigger fires.

-Tim