Historical
IEC 62055-41 Ed. 1.0 en:2007
Electricity metering - Payment systems - Part 41: Standard transfer specification (STS) - Application layer protocol for one-way token carrier systems
"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."
Content Provider
International Electrotechnical Commission [iec]