Dave W wrote:
I have just had a smart meter fitted, and find that it has a bi-directional
optical interface.
It seems that all smart meters have this, and can be accessed by a matching
unit with a magnet
to stick it onto the surrounding iron ring. It uses a slow protocol, and an
interface can be constructed
out of simple components. I think simple readings may use standardised
codes, but anything
more complicated, and commands to configure the meter, all require passwords
and are different
for each manufacturer.

.... and it tells you how much electricity you are consuming, wow!

A clamp ammeter with a PC interface would be easier. quicker and
(probably) cheaper.

--
Chris Green
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