None of RNS, te0 & te1 clock source work except OnbordClock for cDAQ9174?

acquisition system used: cDAQ-9174, NI9206, Labview2009, OR-DAQmx 9.2, MAX 4.7.1

Referring to the "specifying different sample rates for CompactDAQ Modules multiple", following time engines could be used for cDAQ9174 (AI, te0 & te1)

/ cDAQ1/I/SampleClock

/ cDAQ1/TE0/SampleClock

/ cDAQ1/TE1/SampleClock

However, for the voltage-Clk attached Acq Select.vi, none of the above clock works unless OnbordClock is selected. Can someone explain this please?

Hi NCLbingji,

'Source' entry "DAQmx Timing (sample clock) .vi" tells DAQmx to get the sample clock a PFI PIN or another subsystem (such as AO, DIO or counters). It has not been designed to choose what sync engine to use. I think that the example of the community that you mentioned is defining the sample clock source incorrectly.

On a device with a single timing engine of HAVE, like cDAQ-9172, ' IA/SampleClock' by specifying the source of the sample clock I tells DAQmx to deliver the sample clock GOT to the sample clock, which he cannot do it, then it gives you a more useful error:

"Error-89131 occurred in DAQmx start Task.vi:8 '.

Possible reasons:

Attempted to perform an itinerary when the source and destination are the same terminal.

In many cases, like when you configure an external clock or counter source, you must select a PFI, PXI or RTSI trigger line as the terminal of the source.

Property: SampClk.Src
Property: SampClk.ActiveEdge
Source device: Dev1
"Terminal source: AI/SampleClock.

A cDAQ-9174, DAQmx chooses the timing engine when you book the job. The timing engine he chooses does not necessarily match the timing engine that you specify in the VI. If it does not match (for example your VI specifies te1/SampleClock, but DAQmx choose te0), then your task will wait for Terminal produce some clock pulses. Because there, there is no clock on this terminal, the task eventually times out and returns the error-200284 (samples not yet available).

The correct way to explicitly specify what sync engine to use is to set the SampTimingEngine property.

Unfortunately, the table of values for this property by using NOR-DAQmx for 9.2.x version is also incorrect (reported to R & D such as CAR #239502). Here are the correct values:

  • 0 selects te0.
  • 1 selects te1.
  • 2 selects HERE.

You can also leave DAQmx choose a timing engine, then ask that you chose. To do this, choose the task and then get the value of the SampClk.Term property.

Brad

Tags: NI Software

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