Hi I do NOT think that you can connect this unit directly to a PC? It can indeed be connected to "Other" JRC devices, GP. Chartplotter etc, via a special connection box. However I have been unable to find any way to do as you wish?
I have searched for a, any, manual however I have been unable to find any.
My advise is to contact JRC first, and ask them for the details of what you need to know, perhaps they also can supply you with a manual too if you ask? Weblink below for your convenience.
http://www.jrcamerica.com/