Config external trigger to PCIe-1427

Hello everybody.

I have a 1427 framegrabber conected to Basler Ral2048-80Km trough camera link. My problem is to obtain images synchronized by  one of the hard inputs conected to an external encoder.

Up to now got only free running images. I appreciate any help whit that, I'm almost sure is something about the framegrabber config.

Tks.