DAQmx start and read series vi low bits before actually reading

I use DAQmx writing to set the bit on a map of 9403. When I set a little high, then try to read this small in a vi subseqeuent little gets low! Both DAQmx Start DAQmx Read screws seem to back the lower wick. How is that supposed to happen? I was certain that bits would not be initialized weak unless the device has been reset.

I'm guessing that you create a digital output channel, call start, writing and then create as a separate digital input channel and call start-> reading or reading.

Create the input channel changes the direction of the line.  This happens to commit (which you cross when they if call to start, or read with no departure).  Once the changes of direction, you no longer drive line.  That's why you always read zero.

You have two options.  You can call read after write (in the task of digital output), or you can have fun with the tristate property.  TriState is a channel DAQmx (DigitalOutput-> Tristate) property.  Aid that it is good enough.

Two ways to read the value of the line without changing the current state of the row.

Tags: NI Hardware

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