Connect 6021 for bidirectional connection of the former Märklin digital system to the central station 60213-60215. Possibility of controlling 80 locomotives (motorola as well as mfx) with the 6021 Control Unit, switching locomotive functions (function, F1 - F4), switching solenoids with synchronous display of the position. Possible use of the memory 6043 and the memory functionality of the 60213-60215 Central Station. Ports on the back: M-Bus - cable (for connecting to 60213-60215). Lateral Connection: Plug connector for connection to the "6021 world". Dimensions 135 x 120 x 80 mm.