This unit allows connections for the s88 (60881) and s88 DC (60882) and the older s88 feedback modules (6088 und 60880) to the Central Station II an Central Station 3, and to the 60145 Terminal. The unit has an older design socket for the 6088 and 60880 feedback modules, as well as two RJ45 sockets for the new 60881 and 60882 feedback modules. In addition, there are 16 inputs for contact generators (ground detectors such as 60881). These 16 inputs can be configured specially for track diagram control boards so that a matrix with up to 64 buttons can be set up.