limit switchs

I dont know how to search back through posts for researching
anything.Maybe sometime somebody can explain that to me..I feel certain
any question that I might have would have been covered multiple times
if only I could find the pertinent posts....Anyway..
.
I have Bob Campbell's breakout board and still need to hookup
limit/home switchs..Original equipment on this Hurco is break light
beam type switchs.I want to reuse them..Is there some way to wire them
directly to the breakout board or is some intermediate circuit needs
built to adapt them?
Thanks
Steven