Comment by mjochim
13 hours ago
Electric meters often blink a signal LED for every X kWh, so other devices can read the signal. I'm not sure if this is used for bidirectional communications, though.
13 hours ago
Electric meters often blink a signal LED for every X kWh, so other devices can read the signal. I'm not sure if this is used for bidirectional communications, though.
No, but they also have a separate infrared interface for this.
https://en.wikipedia.org/wiki/IEC_62056
Smart meters have a whole protocol