PCI card used for A/D & D/A w/ filter at one time

[stan1860]

I am looking for a NI PCI card which can work as A/D and  D/A simultaneously. Meanwhile, for A/D, a filter can also be connected to the system.

At present, I am using SCXI-1305, SCXI-1141, SCXI-1000 and PCIe-6251 to set up a data acquisition system. The problem is the PCIe-6251, installed in PC, could not work as A/D and D/A at the same time. In other words, it could not input and output at one time.

[Dennis_Knutson]

The card can do both at the same time. The program you wrote cannot. Attach the program so someone can look to see what is wrong with it.

[John_P1]

The confusion might come from the 6251 being cabled directly to SCXI.  You can use the 1180 feedthrough module to access the unused lines of the DAQ baord (including the 2 AO lines).

Best Regards,

[stan1860]

Thanks for your post. Maybe it is a little confusing.

My problem is the hardware rather than the program. PCIe-6251 can do both at the same time. But there is only on I/O connector in this card. For my application, I have to connect it to SCXI-1141 and then to SCXI-1305 for data acquisition. SCXI-1141 and SCXI-1305 are housed in SCXI-1000. Data acquisition will take the only I/O connector as input. Then if I want to use PCIe-6251 as output to control something, another I/O connector is required, which does not exist in 6251, unless it is possible to connect the card to two modules with a splitter.

There is another choice to use A/D and D/A simultaneously by installing PCIe-6251 in NI_USB-6251. However, I could not connect the filter to the card anymore if I set up the system like that.

[stan1860]

Hi John,

Sorry, I am just new to this area. Can you explain in more details? What other accessaries will I need and how can I connect them?

Thanks,

[John_P1]

Hi Stan,

No problem, I can imagine alot of this documentation is hard to find (some of it is quite old).

The 1180 plugs into the 1349 (what you're likely using to connect your DAQ card to the back of the 1141) and can use the 1302 terminal block.

Best Regards,

[stan1860]

Hi, John

I tried to set up a new system as following:

Please tell me whether the construction is right or not?

In my design, I used NI SCB-68 instead of SCXI-1302 you mentioned? Is it OK? If yes, how can I connect SCB-68 to SCXI-1349?

Thanks very much.

[Steven_K.]

Hi Stan,

You will need the 1302 terminal block to use the 1180. The 1180 uses a 50 pin connector rather than the 68 pin connector on the SCB-68. If you would like more information about the 1180 the user manual is linked below:

https://download.ni.com/support/manuals/371062a.pdf

[stan1860]

Do you mean in my application the SCXI-1180 is used as a Daisy-Chain Cable Extender? 

Can the 1302 terminal block be connected to SCXI-1180 by some 50pin-60pin cable? Or can I use 1302 directly to output the analog signal instead of the SCB-68

[enderWiggin10]

Hi Stan,

The 1394 is used to connect the DAQ card to the SCXI backplane.  In this situation, you will connect your PCI-6251 to the 1349, which will be connected to the rear of the 1141, and will in turn be connected to the 1180 feedthrough cable via the 50-pin connection on the 1349.  This is outlined in the manual as mentioned by Steven.