Can I use parallel and multiplexed mode?

[azavarsky]

Hi,

I have

a NI USB-6259 DAQ Module (Two Connectors with to Cables to two SCXI-1349, which connects the DAQ to the Chassis)

a SCXI-1001 Chassis

3 SCXI-1143 8 Channel Low Pass Filter Modules

and

a SCXI-1180 Front End Plate

As the DAQ has 16 diff. AI Channels, I would like to drive two SCXI 1143 in multiplexed mode(connected to Connector 0 at USB-DAQ via SCXI 1349) and one in parallel mode assigned to AI 8-15 (Connected to Connector 1 at USB-DAQ via SCXI 1349) .

The configuration is approved by MAX

But when I run it with the software I get an error saying that a simultaneous scan is possible Error -223835. And that the selected channel is not in the task Error: -200486.

Can one DAQ device(like NI USB-6259) be assigned with Channels 0-7 in multiplexed mode (multiplexing two SCXI 1143 8 Channel) and the rest of the channels in parallel mode for on SCXI card? NI-USB 6259 has to separate connectors but is it still seen as one DAQ card?

What does the error say? I thought I configured for a simultaneous scan.

Attached to this post is a picture:

Top Left: Back view of my NI USB-6259

Top Right: Front view of my chassis with three SCXI 1143

Bottom: Back view of my chassis. Two SCXI 1249 are connected to two Cards. One card should be run in parallel mode, two in multiplexed mode.

Cheers,

Alex

[Lorenz-Mie]

Hi Alex,

I was able to reproduce the errors in MAX using simulated hardware. I also found the following KnowledgeBase:

Can I Use SCXI Modules in Parallel Mode and Multiplexed Mode in the Same Chassis?

http://digital.ni.com/public.nsf/allkb/C94797073B74E51E86256A93005CABFF

It seems you need two DAQ devices to use Parallel Mode und Multiplexed Mode in one chassis.

Best regards

Raphael

[azavarsky]

The funny thing is I get the same error when I run only two SCXI Low-Pass Cards both in parallel mode. This should be possible according to the manual.

Alex

[Lorenz-Mie · Accepted solution]

The following link states:

"In parallel mode, you can use only one module per digital DAQ device; you must connect any other modules in the chassis, in either parallel or serial mode, to a different DAQ device."

Which SCXI Modules are Capable of Running in Parallel Mode?

http://digital.ni.com/public.nsf/allkb/3D45A66A691E4BD886256A6C004A4313?OpenDocument

So you need a seperate DAQ device for every module.

Raphael

[azavarsky]

@ Lorenz-Mie

you are right that I need a new DAQ device, but as stated in the M-Series manual on page A-108:

"Use Connector 0 of  your M Series device to control SCXI. NI-DAQ 7.4

and later supports SCXI in parallel mode on Connector 1."

Thats what I've done. I'll keep on trying.

Alex