PlanetZ forums - scopeusers.com

This is new at pulsar 3 version
but I did not see any use to it
When I try to activate it I got the "cant find the corresponding hardware" massage.
Is it mean we can connect the digital mixer to pulsar via optical instead of the regular sp-dif connectors?

yes.

Read the manual carefully to have a detailed explanation on how to configure the switches in the samplerate window and so on.