Michael Chare wrote:

Is there a little box that I could buy which would have an Ethernet port (and
IP) that I could attach to my home network and would allow me to use my computer
to monitor the status of the mains voltages circuits (of my central heating
system)?

One of the better APC SmartUPS boxes will do what you want. The cheaper
ones have USB rather than Ethernet (although many come with software to
allow the control and status information to be passed over a LAN as well).

--
Cheers,

John.

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