PXI_Clk10 can be found in PXI6115.

I have two PXI6115, and I want to sync them. I found an example of examples of NEITHER. He said that both PXI cards can be synced through sharing RefClk10. But I can't found this reference clock signal. Can you give me any suggestions? Thank you very much.

Frogreenmm,

Let me see if I can help clear up your confusion.  First of all, PXI_Clk10 is a signal that is present only in the PXI chassis.  PXI-6115 have a PLL to lock to the signal.  However, as you said you have a PCI-6115 so this synchronization scheme is not available to you.  To synchronize these devices, you must share the signals between devices through an interface.  You mentioned that you have a RTSI cable, so it will be the best way to do it.  To use RTSI with DAQmx, you will need to go to the measurement and Automation Explorer (MAX) and add RTSI cable as a DAQmx device.  This DAQmx allows to know the presence of the RTSI cable and will also allow the driver to perform automatically routes between your devices using this interface.  To add cable RTSI, go to MAX and expand devices and control of the Interface.  NOR-DAQmx devices and choose create new DAQmx Device-> RTSI cable.  The RTSI cable should then appear in your list of devices.  Right-click on it and select 'Add the device to RTSI cable.'  This is to add both of your PCI - 6115 s RTSI cable.

At this point, I guess you have physically connected the two devices with cable and now DAQmx knows in this regard.  Now, we could use one of the many methods to synchronize the devices.  We can share a master time base and start the détente between the two devices or we could share a clock sampling and a trigger of departure between the two devices.  The example of delivery DAQmx titled 'Multi - Device Synch - Analog Input - Finite Acquisition.vi' is an example of how share a time base and trigger start (look at the case of block diagram ' E and S series share Master Timebase ').  In this case, the two devices will share the time base of Dev1, and both devices will use the beginning of Dev1 trigger to begin their acquisition.  As long as you added your cable RTSI for MAX and added your devices to the RTSI, DAQmx cable can take care of the details of routing of these signals.  An important note about this approach is that you call start on the 'slave' (Dev2) 6115 before calling start on the 'master' (Dev1).  It is so Dev2 is ready for the trigger start signal when Dev1 sends it.

You can use a very similar approach by a sample clock between the two devices sharing rather than share the main time base.  Yet once again, I recommend that you also share a trigger to start and start the 'slave' device before starting the "master" unit

Hope this helps,
Dan

Tags: NI Hardware

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