Encoder with Ni PCI-6122

"Error -200431 occurred at DAQmx Create Channel (CI-Position-Angular Encoder).vi:3840002

Possible reason(s):

Selected physical channel does not support the measurement type required by the virtual channel you are creating.

Create a channel of a measurement type that is supported by the physical channel, or select a physical channel that supports the measurement type.

Property: CI.MeasType

Requested Value: Position:Angular Encoder

Possible Values: Frequency, Period, Pulse Width, Semi Period, Count Edges"

 

The second part I tried to trigger continous analog read to the ticks out of the motor encoder, but it hasn't worked. So how can I trigger analog read to counter input ticks? I need to get analog data for every tick.

 

Thanks,

Peter