The smart metering data concentrator MDC is a universal data controller for various types of energy meters, for automatic data collection systems and for electricity meters. The compact, microprocessor-controlled device operates in a variety of conditions, in data acquisition systems of different architectures. Data transmission is via GSM / GPRS / 3G / GSM-R (optional), LAN or WAN to the central server. All controller interfaces (CL and / or RS485) are independent, so they can work at different speeds and different communication protocols at the same time. MDC ensures data separation levels and information security for multiple independent users.