Description
The EM Proximity access card is a thin (ISO) card available in read-only and read/write versions.
This card operates at 125 KHz standard, with encrypted access.
The read-only version contains unique, tamper-proof code (64 bits), that has been factory programmed.
The read/write version is composed of a 128 bits of EEPROM, offering different access possibilities.
The card is used with matching readers, GK4001 reader for read-only cards and GK4011 reader for read/write cards.
The chip used in the card requires no battery for operation and receives power from its built-in coil in a magnetic field generated by a matching reader device.
The chip continuously transmits 64 bits of data stored in an EPROM array whenever the chip is in the field range.
The output data is modulated using Manchester Coding with a bit rate corresponding to 64 periods of the field frequency.
The chip function is obtained/transmitted by adjusting a capacitor in parallel with an external coil to generate adequate resonance.
