POS Systems is a kind of commercial equipment, which is an essential part of automation systems in public catering and trading. Computer cash register system consists of cash registers, fiscal data recorders, etc. Herewith, the main purpose of a cash register is the registration of the purchase of the goods, and printing of the cash receipt. More of it, in Russia cash registers, which are an integral part of the POS systems also take on the function of state control over the money turnover of trade enterprises and public catering establishments. Cash registers may be fiscal (such devices are used in those countries where fiscal law acts), and non-fiscal. The main feature of fiscal cash registers is the fiscal memory, a certain data storage device, the removal of which is impossible.