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What is the clock rate for Digital Inputs(DI) and Digital Outputs(DO) of U23xxA and U25xxA USB Data Acquisition?

The DAQ DIO is not meant to measure DI with clock rate precision or to control frequency of digital output application but rather it is aimed for simple switching application. Eg, DI to monitor logic return from actuator and DO generate logic high/low to turn on non frequency or time critical valve.