I was wondered if I use a PXI chassis with more than 7 slot such as PXI-1006, whether I was requiered to use 2 PXI-PXI Brige modules to build my testing system if I have to use more than 8 test modules?

[lqyun]

as title.
And I didn't understand the trigger line requirement in the specification discriped as follow "The PXI trigger bus provides connectivity with a single bus segment and does not allow physical connection to an ajacent bus segment" and "In PXI systems where there are more than two segments, it is recommended that the start triggers are only routed to the slots in the first two segments, but other routings are allowed". These two requirements sound self-contradictory. So I was wondered how to implement the trigger lines physically?

[JuliaD]

Hello,

It sounds like your first question is about how to use an external controller for your PXI chassis when working with a PXI-1006 chassis. To use a external controller (i.e. MXI-3) with any one of our chassis, you only need to work with one MXI-3 kit. This is made up of a PCI-MXI-3 board that is installed in your PC, connected via a cable to a PXI-MXI-3 module installed in slot 1 of your chassis (e.g. a PXI-1006 chassis). This will controll the entire chassis.

As far as your second question goes where did you obtain the two exerpts of information with regards to the PXI Trigger bus? Since the PXI-1006 chassis contains 18 slots, these are divided into 3 segments (6 slots per segment). The segments are joined together via a built in PCI-PCI bridge. You c
an automatically route triggers between devices in any one segment via the PXI Trigger Bus. The PCI-PCI bridge that exists between the segments in the chassis routes the PCI bus, but does not explicitly route the trigger bus. However, using the PXI-1006 you can route triggers from one segment to another. For more information about this, please email or phone an Applications Engineer using the following link:

www.ni.com/ask

Regards,

Julia Dinolfo
Applications Engineering
National Instruments