![]() I think it's usually 5V in the order of 100's of Hz? Whatever you are using to read from the meter has to generate the clock pulses to power and receive the data. They are often sealed, so they don't want any old Joe trying to commmunicate with them. The protocol is widely used in other manufacturers devices as well and these meters are generally used by utility companies to read and bill customers. Since 2000 they've been using SENSUS Protocol, found inside SENSUS ICE Registers. That was actually introduced by Rockwell back in 1984. They don't use Electronic Communication Register(ECR) anymore. Interesting to note: SENSUS used to be owned by Rockwell International.
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