IEC PAS 62055-41:2003 pdf download Electricity metering – Payment metering systems – Part 41: Standard Transfer Specification
1 Scope
This section of NRS 009-6, in conjunction with NRS 009-6-7, NRS 009-6-8 and NRS 009-6-9, specifiesthe standard transfer specification (STS), i.e. the minimum standard for transferring units of credit andinformation between a common vending system (CVS) and a compliant electricity dispenser (ED).
This section of NRS 009-6 is intended for use by manufacturers of EDs that have to accept tokens thatcomply with the STS and manufacturers of vending systems that produce STS-compliant tokens.
2 Normative references
The following standard and specifications contain provisions which, through reference in this text.constitute provisions of this section of NRS 009-6. At the time of publication, the editions indicated werevalid， All standards and specifications are subject to revision, and parties to agreements based on thissection of NRS 009-6 are encouraged to investigate the possibility of applying the most recent editions ofthe documents listed below. lnformation on currently valid national and international standards andspecifications can be obtained from the South African Bureau of Standards.
NRS 009-6-7:2002，Electricity sales systems- Part 6: Interface standards-Section 7: Standardtransfer specification/Credit dispensing unit- Electricity dispenser Token encoding and dataencryption and decryption.
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NRS 009-6-8:1997,Electricity sales systems – Part 6: Interface standards – Section 8: Standardtransfer specification/Disposable magnetic token technology — Token encoding format and physical
token definition.Amdt 1NRS 009-6-9:1997，Electricity sales systems Part 6: Interface standards – Section 9: Standardtransfer specification/Numeric token technology — Token encoding format and physical token definition.Amdt 1
SABS 1524-0:1997, Electricity dispensing systems – Part 0: Glossary of terms and system overview.
3 Terms, definitions and abbreviated termsFor the purposes of this section of NRS 009, the definitions and abbreviations given in SABS 1524-0apply.
NOTE Throughout this section of NRS 009-6, reference is made to “ED” (electricity dispenser), which is synonymous withprepayment meter”.
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4Requirements
4.1 General
An STS-compliant ED shall be capable of reading and interpreting all of the categories of tokensuccessfully. Where an optional transaction is not implemented in an ED the ED shall indicate that thetoken has been rejected.
4.2 Categories of token
Three categories of token exist, namely:
a) credit transfer tokens, that are normally used by customers (see 4.2.1);b) management tokens that are not ED specific (see 4.2.2); andc) management tokens that are ED specific (see 4.2.3).
The use of management tokens is normally restricted to utility personnel.
4.2.1 Credit transfer tokens
The transactions that shall be available using credit transfer tokens are listed in table 1.
4.2.2 Non-ED-specific management tokens
The transaction that shall be available using non-ED-specific management tokens is a transaction that will initiate an ED test. This transaction is intended for use by installation or maintenance personnel.