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Identifiers for protocol identification service

References: Green Book Clause 4.3.3.3, IEC 62056-42, Clause 6.3.3.

The physical layer protocol provides an identification service to allow the client to obtain information about the protocol stack implemented in the server.

The following identifiers are defined:

• protocol: the value 0x04 of the std-protocol-id identifies the three layer, connection oriented, HDLC based protocol stack as defined in the Green Book and in the IEC 62056-42, IEC 62056-46 and the IEC 62056-53 standards;
• version: the value 0x01 of the std-protocol version identifies the protocol included in the first edition of the above standards;
• revision: the value 0x00 identifies the number of the amendments (no amendments at this time).

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