How to use SMB trigger input on PXI-8187 in LabView

Hello!
I have PXI-8187 controller instaled in PXI-1031 and two PXI-4071 digital multimeters. I want to trigger mesurement with external trigger. One way is to used AUX port on DMM, another can be TRIG input on PXI 8187 CPU unit. Is possible to use this possibility in LabView 7? How?
Best regards!

There are multiple reasons why this is not a supported feature for triggering under Windows and why NI does not recommend using the controller's SMB connector for this purpose. National Instruments has hardware that was designed specifically for extremely accurate clock generation, synchronization, and triggering between PXI chassis (PXI-665x) and other recommended alternatives listed below.
Non-deterministic propagation delays
1. The controller's SMB input is not guaranteed to have a defined propagation delay to the backplane. This means the SMB trigger on the Windows PXI controller is useless for customers that want deterministic triggering. Unlike our PXI-665x boards which have a maintained API and precise triggering properties, the PXI controller's SMB connector and routing circuitry is intended for Watchdog use under LabVIEW RT and isn't designed for this use case. A trigger propagating through the SMB circuitry and going to the backplane, or vice-versa, could have a great deal of variance in the propagation delay which makes gathering useful triggers impossible. This propagation delay is not something National Instruments specs.
An excellent available workaround: Use the measurement hardware's trigger inputs
2. The triggering inputs on our measurement hardware (that customers likely have in their system) can route triggering signals to the PXI backplane (usually through PFI lines) with deterministic results. This functionality is fully supported in most of our APIs and will be maintained between generations of devices.
NOT backward or forward compatible
3. The SMB input is NOT guaranteed to be compatible between different versions of our PXI controllers under Windows. The hardware properties along with an excellent workaround are the reason we do not support doing routing of triggers through the SMB connector on our PXI family of embedded controllers under Windows. If you are still interested in the beta software despite the shortcomings, visit www.ni.com/support and submit an e-mail request.
Adam Ullrich
PXI/VXI Product Support Engineer
National Instruments

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Solved!
Go to Solution.

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