Can't select browsable properties

[Quiztus2]

I have missing properties regarding write and read in my daqmx Task Channel properties.
1st question: Is this a bug?

I can browse them, but not select them.
The Digital Counter property in the screenshot is copied from this example here:
Counter Output PWM with Dynamic Duty Cycle Updates in DAQmx - NI Community

2nd question: Do I have to Stop and Start necessarily?

 

 

[ZYOng]

You need to wire a channel to the DAQmx Create Virtual Channel to access their properties. The reason is explained in DAQmx Property Node is Missing Properties

You can change the duty cycle on the fly without stopping the task. Change Duty Cycle on a Continuous Pulse Train of NI-DAQ™mx Task

[Quiztus2]

I had to change the filter setting in right click menu. Now I face this issue:

Hi, there is ambiguity:

This example  Change Duty Cycle on a Continuous Pulse Train of NI-DAQ™mx Task - NI Community says:

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 Pass the new value for the duty cycle, as well as the desired frequency (even if it has not changed) to the property node.

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This KB says Generate a Continuous Digital Pulse Train With On The Fly Frequency Control - NI

 As frequency is a defined configuration property, identical frequency values cannot be sent to the DAQmx Write function in concurrent loop iterations; therefore, a case structure must be implemented to update the frequency value only on value change.