Main function：
* 2-4 tariff-rate measurement on KW.h and the demand, store the data of current and last month 。
* 8 data tariff-rate period of time, and also have calendar、time and leap year switch antomatically function 。
* LCD display。
* Adopt optical-electric couping output with RS485 port。
* Infraed remote programming, reading even if power cut。
According with GB/T15284-2002 standard
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