Well,
I want to use the RFID-Cards to unlock some menus in a few PanelView 1000 Plus, and
I guess USB would do it's job too.
Ethernet would make me able to integrate a few more things than just unlocking the PV.
Sure, I could use PINs or something, unfortunately people give those out because of laziness which I am trying to avoid with RFID. Cards can be borrowed as well, but then I can keep track of it.
Anyways, I will have a look on those options.