The IEC 62055-4x series primarily deals with the application layer protocol and IEC 62055-5x series with the physical layer protocol of the TokenCarrierToMeterInterface. The TokenCarrier is included in the Physical Layer. In this standard the Decoder (see Clause 3) is defined as that part of the payment meter where the Application Layer functions of the TokenCarrierToMeterInterface are located and it is thus allocated a DRN (see 6.1.2.3).
NOTE MeterFunctionObjects are further discussed in 5.5.
In a single-part payment meter all the essential functions are located in a single enclosure as depicted in Figure 1 above, in which case the decoder is integral with the metering function and the DRN could thus optionally be synonymous with the meter serial number.
In a multi-part payment meter it is possible for the TokenCarrierToMeterInterface to be
located in a separate enclosure from that of the metering function, for example, which may well be a stand-alone meter in its own right and having its own meter serial number. In this case, the DRN would not be the same as the meter serial number but would be distinctly different and would thus be marked on the enclosure containing the decoder.
In all cases, there shall only be one Application Layer implementation and thus there shall be only one DRN associated with a payment meter, whether it is single- or multi-part, even
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