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Controlling Two SCXI Chassis Using PXI DAQ Cards in a PXI-1010

Hardware: SCXI

Problem:
I have a remote SCXI chassis connected to PXI DAQ card in PXI-1010. The PXI DAQ card is in the last slot of the PXI-SCXI combo chassis. My measurements are railing on all channels when I use the attached SCXI chassis and the remote SCXI chassis. Is there a way to fix this?

Solution:
The second chassis is not measuring correctly because the daisy chain index automatically is set to a number other than the internal SCXI chassis. This daisy chain index needs to have the same index as the internal chassis because this is not considered daisy chaining. Daisy chaining is necessary when you are using an SCXI-1346 jumper connection out of the back of the internal SCXI chassis of the PXI-1010.

To change this back, Right click on the remote chassis under Devices and Interfaces»NI-DAQmx Devices. Select Properties. Below is an image of where to change the daisy chain index on the Properties window.

Figure 1: SCXI Chassis Configuration

This can be verified by using an SCXI-1346 and changing the daisy chain index to 1. Both methods work, however when you make the cable connection directly to the DAQ card, it is necessary for both daisy chain indices to be 0.

Note: Make sure both SCXI chassis have separate addresses because if they do will not auto-detect correctly. This will result in the DAQ card interpreting that there are two modules in slot one, which will result in an error. Only the daisy chain index for both SCXI chassis need to be the same.

Related Links:
KnowledgeBase 3KCFRUXR: What is the Daisy Chain Index?

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Report Date: 04/28/2005
Last Updated: 11/24/2008
Document ID: 3KRI87Y3

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