How to prevent encoder duplicate count with a PCI-6036E card

Hi all,

I have a PCI-6036E card which has an encoder signal connected to CTR_0_SRC (PFI8) input. When a try to read encoder counts I get a duplicated value. My card doesn't support the "Duplicate Count Prevention" property. How can I solve this problem?

In addition I have the encoder channel B connected to GP_UP_DOWN (P0.6) input to detect movement direction.

Thanks a lot in advance.

Regards

Maria