specifies the application layer protocol of the STS for transferring units of credit and other management information from a point-of-sale (POS) system to an STS-compliant payment meter in a one-way token carrier system. It is primarily intended for application with electricity payment meters without a tariff employing energy-based tokens, but may also have application with currency-based token systems and for services other than electricity.
IEC 62055-41 Ed. 1.0 en:2007
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Electricity metering – Payment systems – Part 41: Standard transfer specification (STS) – Application layer protocol for one-way token carrier systems