STS (Standard Transfer Specification) global solution based on open standard providing interoperation between all elements of different producers of prepayment systems. STS is recognized international standard that meets IEC requirements. Technology used is completely safe by suitable encryption to protect prepayment transactions. The devices operating in STS system must have only certificate of compliance with STS.
LEWsystem Apator is a comprehensive solution enabling prepayment sale of electrical energy, based on purchase of a specified amount of kWh by an individual recipient. The payment for the energy is made in advance and the usage of the purchased energy can be spread over a period of time. The carrier of the information on the amount of purchased electric energy is a 20-digit code. The code may be used only once and only in a meter for which it was generated. The code is entered using a panel placed on the meter or using a TV remote utilising an RC-5 coding algorithm.
The central element of the prepayment system is the Code Generator at the Apator SA headquarters. In answer to requests from commercial modules of the system and technical modules it sends special codes being the equivalent of purchased electrical energy or coded technical commands setting parameters of LEW type meters.