Stored prepaid meter common method

Stored in two ways, one for the code type, one for writing cassette.
Code type principle is: the user information management system will combine information and the purchase of electricity 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  electric meter or the amount of electricity and save.
Write cassette: the pre-charge or the amount of write-only electronic card (memory), the electronic card to the user holds on to the corresponding meter communicates  circuit breakers  feed the meter pre-order value.
Said electronic card or IC card, also known as power purchase card, a dedicated IC chips are made through a special Circuit breaker  together, common electricity purchase card by means of communication are divided into contact and non-contact.
Contact are: cards cards, key cards, non-contact are: RF card, remote control card