Prepaid meters principles and common sense

 Common prepaid meters are electronic meter based on the increased micro-computer processing unit and a storage unit and the control power devices constituted. Must be stored in the meter  mcb circuit breaker  a certain amount of electricity or electricity, while electricity meter when measured value is deducted from the remaining  electri cenergy meter use of electricity or the amount, if the buckle is finished off, in order to ensure the normal use of electricity must be stored again before the power meter and added to the residual value.
Or the amount of stored energy must pass vending system administration pre taffs charged to users only after stored to the user. Stored information fed through a certain way in order to use the meter. Commonly stored in two ways, one for the code type, one for writing cassette.
Code type  circuit breakers , user information and management system will combine the power purchase information to generate a set of encrypted code, and handed over to the user's own input into the meter, the meter is properly decrypted been stored or the amount of electricity and save.
Write a cassette is write-only pre-charge or the amount of electronic cards (memory), the electronic card to the user holds on to the corresponding meter communicates automatically feed the meter pre-order value.