The operating-memory unit is most often used to control electronically secured door. The unit consists of electronics, drive processor, EEPROM memory for 900 or 3000 users with up to 1800 events capacity and circuits for secondary device control such as electromagnetic lock, sound signalization etc. All operating - memory units can operate off-line without connection to PC as a stand-alone unit using internal EEPROM memory to store data. In on-line connection the units are connected to PC via appropriate device and the data is stored directly to PC.