Got my Videx GSM4KCR up and running but i need to be having voltage with gates open or voltage when closed for my gsm to read the different status. Would a pair of photocells that are obscured by the gate when the gate is open back to the wall and connected when closed provide this and power the relay?.....is it a sensible way to do it?....or is there another way?....my gate controls know themselves when they are opening or closing but there are no terminals showing open or closed in terms of voltage output difference when the gates are static.