For connection at digital centre and interfaces which supports the s88 feedback bus eg mrklin interface mrklin memory central station 1 and 2 intellibox twin center easycontrol viessmann commander und hsi 88 usb the feedback module rm 88 n is available via 16 inputs which is switched on according to the ground eg mrklin s88 safe and simple connection of circuit tracks contact tracks track occupancy indicators and dry reed contacts etcvia screw terminal the feed back m