Error -201278 Device Cannot Guarantee a Reliable Transmission

Updated Dec 28, 2023

Reported In


  • USB-6525


  • NI-DAQmx

Issue Details

I am performing a digital output task on the USB-6525, during which I receive 

Error -201278: The frequency of successive write operations is too high.
The device cannot guarantee a reliable transmission. 

What is causing this error?


The USB-6525 can damage its DIO lines if they are toggled too fast. The error message was implemented in DAQmx version 8.9 to prevent users from damaging the lines. Tasks that toggle the DIO lines, built on the DAQmx driver prior to version 8.9, will not see this error message but still may be causing damage. As such, users should upgrade to at least DAQmx 8.9 to ensure that the frequency of the DIO cycling will not damage the module.

The toggle rate of the USB-6525 can be found in the Solid-State Relay Outputs section of the detailed specifications link below. It is listed at 5 operations per second (5 Hz), or a 200 ms period between each cycle. This information is not found on the main specifications tab for the product, so the customer is likely to miss the information; they have to navigate to detailed specifications.