Archived:Error -209836 When Setting First Sampleclock Property on FieldDAQ Using TSN

Updated Dec 28, 2023

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Reported In


  • NI-DAQmx
  • NI CompactRIO

Issue Details

I have my FieldDAQ in a daisy-chain with a TSN-enabled CompactRIO. I need to set the FirstSampClk.When property because I'm running DSA tasks on both targets, and I want to synchronize them. When I try to set this property, the property node produces error -209836.


This is a known issue with DAQmx on TSN-sync'ed FieldDAQ targets. This bug was fixed in DAQmx 19.1 (CAR ID 734612).
  • To resolve this behavior, you can upgrade to the latest version of DAQmx
  • If it is not possible to upgrade the software for your system, follow the workaround steps below:


  1. Explicitly set the timescale of all devices to I/O Device Time by specifying the FirstSampClk.Timescale property to I/O Device Time and setting the Sample and Timebase Rates to match the settings below.
  1. Explicitly set the FirstSampTimestamp.Timescale property to I/O Device Time
This will prevent the FirstSampClk.When property node from producing error -209836, and will restore full functionality of the property.