POS-system (POS - Point of sale) is a set of software and hardware units, the main purpose of which is the automation of working places of cashiers. Among the basic operations made by POS-systems is selling and returns, withdrawal operations, etc. Furthermore, there is a possibility of expansion of the functional provided by increasing of the amount of supported hardware. The configuration of POS-system combines POS-PC, POS-screen, customer display, programmable keyboard, fiscal printer and magnetic card reader, conventionally divided into POS- equipment and peripherals. One of the key elements of the POS-systems is the fiscal printer, which is indispensable for automation of the cash operating unit. This is a receipt printer with fiscal memory, which is connected to the system unit of POS-system. Another component of POS-system is POS-computer (system unit), that is, industrial computer, which enables the connection and operation of the various peripheral POS-equipment. The work efficiency of the whole system depends on its capacity. Currently trading enterprises may purchase POS-systems that meet all the necessary requirements, having various efficiency and functionality, as well as suggesting a different arrangement of the individual integral parts.