DAQ module (NI PXIe-6363, PXI):

[sekhar23]

I am exploring different options to trigger NI-PXIe 6363.

Can we trigger NI-6363 with NI-4139 SMU channel by configuring APFI as trigger source.

[ZYOng]

If all modules are on the same chassis, you can make use of the PXI backplane trigger without any external wiring. 

Connecting a SMU Signal to a PXI(e) Backplane Trigger Line in LabVIEW

to route the start trigger from PXIe-4139 to the backplane, then use NI-DAQmx Configure Trigger (Digital Start) VI in PXIe-6363 to receive the same trigger.

For more details, see Using PXI Timing and Triggering Functionality.

If you are using a 18-slot chassis, please take note on Routing PXI Trigger Lines Across the Buses of Multi Segment PXI Chassis.

[sekhar23]

For time sensitive measurements i want to avoid the backplane triggering. 

[ZYOng]

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@sekhar23 wrote:

For time sensitive measurements i want to avoid the backplane triggering. 

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Can you explain more about the time sensitive measurements?

If you are expecting a smaller skew, you should choose backplane over external wiring. See Table 2 in Synchronization Explained.