How to programm the memory on the PCI/PXI 6534

[OZI]

Hi,
for a project we have two PXI 6534 DIO cards. One for continuous pattern output, and the other for a input of digital datas.

The data to output are only 500 word each 32 bit. We want a continuous output on a high speed. So we configured the card and start the output. It runs, but we don't know if the datas are really in the onboard memory. On high speed (20MHz) we have no more clean signal, which means, that we think there is a jitter on the output.

How can we be sure that the 500 output patterns are really in the onboard memory.

On the other hand we want to read in digital datas. To avoid a jitter during the read cycle we want to be sure that the datas are first read in the onboard memory and the transferred to the computer memory.

How can we be sure that the card first save the datas on the onboard memory ?

Thanks
Oliver

[JoBa]

Hello Oliver,

please refer to the following article for Output Looping with the NI PCI-6534:

http://zone.ni.com/devzone/cda/epd/p/id/1731

It contains an example VI that does continous output from the onboard memory.

As for digital data acquisition, the following article contains examples and benchmark results:

http://zone.ni.com/devzone/cda/tut/p/id/4181

I also can recommend the following, very thorough article on 6534 performance:

http://zone.ni.com/devzone/cda/tut/p/id/3631

I hope these can help you to reach the input and output rates you require.

Please post again in this thread if you have any further questions.

Regards,
Johannes

NI Germany 592232

[JoBa]

Hello Oliver,

I just realized that you probably want to program you PCI-6534 in CVI rather than LabVIEW.

The following example shows how to do double-buffered output via the onboard memory in C:

http://zone.ni.com/devzone/cda/epd/p/id/5024

This one should also help you enabling the buffering for digital input.

Benchmarks can be found at

http://ae.natinst.com/operations/ae/public.nsf/web/searchinternal/4fca248d888831c386256d8900563e45?OpenDocument

Regards,
Johannes

NI Germany