software trigger 
Author Message
 software trigger

I would sysnchronize acquisition between systems using a ethernet
link. As the AI Start vi takes a long time, I would generate a trigger
signal by software to start acquisition when I receive the command
throught ethernet.
I am using PXI 8175 controller (which has, on a hardware point of
view, the capability to generate a trigger on the PXI bus) and PXI
6040E DAQ card.
I would avoid external connection.
Any idea (and example) are welcome.

    Hubert Robitaille

Mon, 26 Dec 2005 23:15:48 GMT  
 software trigger
Synching via ethernet is not something I would recommend.  There is
latency and (worse) latency <B>variation</B> everywhere in ethernet
land.  The PXI chassis does have RTSI lines for triggering, but that
does not get you synch between systems.  I'm not sure what you mean by
AI Start takes a long time.  It seems pretty snappy to me.

The best method I've found to synch two systems without getting too
fancy is to run a wire from the master DAQ board's SCANCLK output to
the TRIG0 of the slave DAQ board in the other system.  If the two DAQ
boards are on the same PXI backplane, you can configure the RTSI bus
to synch them very nicely.

The PXI is some high-end hardware.  You might want to consider hiring
an expert Alliance Member to show you its full potential.

Daniel L. Press
PrimeTest Corp.

Mon, 26 Dec 2005 23:24:24 GMT  
 [ 2 post ] 

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