"door state" module (hardware and software)

[giphahne]

we need an interface to understand the state of the door(s) controlled by the access controller system. Without this, it is not possible to (easily) determine whether an access event is opening or closing the door.

[agriboss]

I believe least costly option would be a simple limit switch mounted somewhere on the door:
http://www.mouser.com/ProductDetail/Omron/V-155-1C25/?qs=jlWqeHNmHbQGC98b%2FpsKwg%3D%3D&gclid=CJinq6Si6dQCFdSPswodmjcNxQ