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SCXI-1125 and PXI-6115 parallel mode

Hi,

 

I hope I posted this in the correct forum.

 

I want to connect an SCXI-1125 to a PXI-6115 and run it in parallel mode.  However, I'm having trouble finding documentation describing exactly how parallel mode works.

 

1. In parallel mode, does the SCXI card still perform its signal conditioning (i.e. gain, filtering)?

 

2. Page 4-1 in the PXI-1125 user's manual, it appears that the signals must always pass through the multiplexer to reach the rear connector which suggests that even in parallel mode the signals are multiplexed in the SCXI and therefore subjected to the SCXI limit of 333kS/s?  If so, will it be 333kS/s per channel or still roughly 333kS/s divided by the number of channels?

 

Thanks for your time,

Chris 

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Hey Chris,

 

The SCXI still performs signal conditioning in parallel mode. The only difference between the parallel mode and the multiplexed mode is the signal routing.

 

Regarding your second question, you will find the following explanation under the page 4-4 of the SCXI 1125 User Manual:

 

http://www.ni.com/pdf/manuals/372425c.pdf

 

"Parallel mode allows you to bypass scanning and
you are not limited by the settling time required by the multiplexer of
SCXI-1125. You can scan the channels more accurately at a faster rate,
depending on which E/M/X Series DAQ device you connect to the module."

Regards,
Efrain G.
National Instruments
Visit http://www.ni.com/gettingstarted/ for step-by-step help in setting up your system.
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