Question

Hi,

I have a RFID card with a printed serie 0005996122 091, 32346

When I read the card, in the packet the values are:

Decimal: 97529271249207306

Hexa: 01-5A-7E-5B-00-03-00-0A

The value 5B-7E-5A (5A-7E-5B) it's ok, is the 0005996122 printed in the card but the other values 01-5A-7E-5B-00-03-00-0A I don't know where they come from.

Can you help me please

Answer 1

Hello,

Thank you for your question.

If we reverse it, it will look like - 

0A-00-03-00-5B-7E-5A-01

The structure of the protocol is - 

0x0A - CRC-8Bit (calculated each time)

0x00 - Constant value (It will always be 0 here)

0x03 - Producers code (The Producer’s code can not be calculated it is written to the ROM and depend by the manufacturer.)

00-5B-7E-5A -  Unique iButton serial no. (Printed on the cards)

0x01 - Family code

Hope this help you.

Best regards.