Hi, This might be a very simple answer, I am getting a 5102BCLEDL 2 channel bus coupler. What I need is a suitable reed switch to connect to it so that I can use the reed switch to tell me when a door is open. The door has a shutter above it, so I want to disable the shutter from going down if the door is open. Aside from how they work, I know nothing about reed switches. Any better than others? Things to consider? I am guess the unit will pop up in Toolkit and I just go from there in terms of programming? Thank you for any help. Cheers, P_R.