Psychopy square wave to bnc

Hello ! 

I am very new to the labjack and I have a question to update my crurent expérimental setup :

Right now, I'm using a parrallel port to send a square wave (event marker) via a BNC input on my acquisition box, with the help of PsychoPy

Unfortunately, my computer died and I need to replace it and find a way to do the same thing without the parallel port. The labjack U3 seemed like a good fit, so my question is : Can I use PsychoPy to ask the labjack (wired from the PC usb, to the BNC acquisition box) to generate a square wave as an event marker/trigger ? 

Thanks :)