otis hydro, power sliding car door, swing landing doors, car top inspection, 3 stops, xu,xd,nt,dw,d,gc,go,u,c,j,1c,2c,3c relays in controller, 208 supply, retiring cam is chain driven off of the door op linkage and pulls the chain to lift the retiring cam and lock the landing door when car door is closed. set/reset direction switches on rails with cam on car. thanks in advance.