Hi brother!
The elektor magazine published article with the Siemens Meter!
Go the site elektor home and see the edition number: www.elektor-electronics.co.uk
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My name is Gorkin gorkin@bol.com.br
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Look at IEC website, http://www.iec.ch, and search for IEC1107.
The document needs to be purchased...
There is an IEC FLAG a sub-set of IEC 1107, to communicate with meter.
Please visit http://www.pilotsystems.com/ to obtain the document.
Let me know if your project success.