As a part of EN 54-16 approval, the system VARIODYN® D1 was expanded to include the VCM (View Control Module). It allows standard-compliant display of collective messages and allows the entry of operations over 5 keys.In the case, that several floor standing cabinets are accommodated immediately side by side in a room and form a system to suffice a VCM per room. Remote cabinets require a separate VCM. The VCM is connected directly to a UIM and 24 V DC. Any DOM in the cabinet, in which VCM is located, is connected to the corresponding VCM input. All other DOMs are integrated via Ethernet. The programming of the VCM is easy and comfortable to use a macro in the programming software called "Designer".