Water meter card Drip card product overview!
Commonly used electric meter drip card encryption memory card drip card, drip card by checking the password to protect the data in the card is open to external access. Water meter drip card uses pre-charge method, the card is inserted into the smart water meter, the water meter automatically reads the card and calculates the flow rate. When the flow rate is exhausted, the water meter automatically disconnects, buy water card chip 1024 write byte protection zone ( cured data ), 2 bytes password, error counter 3 II, temperature range -35 ℃ ~ 80 ℃, at least 100,000 second erase cycle; data storage for at least 10 years.
Common models of peal water meter drip card
Water meter card uses SLE4432, SLE4442, FM4442, and other non-contact models of drip cards, commonly used SLE4442 is an encrypted memory card, capacity of 256 byte. check the total password is correct before reading and writing the card. The first 32 bytes of the card can be written to protect the bit. The total password error counter value is 3, check the error once, minus 1 operation, if the count value is 0, the whole card data lock. If three checks are correct, the counter will restore the initial value. sle4432 no password operation function is similar to 4442. Function: 256 bytes EEPROM; 32 bits protection memory; 3 bytes user password error counter: 3 times; temperature range: 0℃~70℃; data retention period at least 10 years.