What are the communication methods of smart watt-hour meter? Infrared, 485 communication, wireless communication, power line carrier communication; What are the characteristics and differences of these communication methods? Infrared: strong directivity, slow transmission rate and reliable transmission;

485,: non-directional, stable transmission, fast speed, but need wiring;

Unlimited communication: no direction, stable transmission, average speed and high price;

Power carrier: non-directional, unstable transmission, no need for additional wiring, low cost.