For connection at digital centres and interfaces which support the s88 feedback bus for example mrklin interface mrklin memory central station 1 and 2 intellibox twin center easy control viessmann commander and hsi 88usb the feedback modules rm 88 n has more than 16 inputs that must be switched according to the measure like mrklin s88 simple and safe connection of switching tracks contact tracks track busy alert and reed contacts etc via screw terminal the feedback module