hello i use this code: /*** * RDM6300 reader * * Demonstrates a basic RFID puzzle using a single RDM6300 reader. * When any tag is held up to the reader, the UID is displayeed as both a series of HEX bytes * and a long integer (in many cases, this is the format as printed on an EM4100 card i…

[image] byronas: dont know how to convert this 0002281131 where did you get that ? without separators in between the bytes there is no way to know...

i used an rfid card that works this is known 2, 56, 51, 48, 48, 50, 50, 67, 69, 65, 66, 67, 52, 3 (from my code, from an rfid that works) the reader : 26bit number 00001000101100111010101011 decimal number 0002281131 2 x 16 it number 0034; 52907 HEX 022CEAB

the tag ID seems to be 14 bytes, starting with 2 and ending with 3. So you need 12 bytes in between. I've no clue what you mean by [image] byronas: the reader : 26bit number 00001000101100111010101011 decimal number 0002281131 2 x 16 it number 0034; 52907 HEX 022CEAB

[image] byronas: 2, 56, 51, 48, 48, 50, 50, 67, 69, 65, 66, 67, 52, 3 ( yes i have understood this (also in comment in code) // CONSTANTS // Data structure returned by the RDM6300 is 14 bytes long, as follows: // 1 byte head (always has value 0x02), // 2 bytes version, // 8 bytes data, …

so you don't have a RDM6300 reader nor a RDM6300 compatible tag ?

i have both. rdm6300 and card. i also have a rfid reader also compatible with the cards. maybe i dont explain my problem well!!! so in the code it use byte[14] sample of what rdm6300 reads 2, 56, 51, 48, 48, 50, 50, 67, 69, 65, 66, 67, 52, 3 now i need to replace one of the cards with a new on…

OK got it the data you have in HEX 0x022CEAB is what goes into the 8 bytes data of your payload in ASCII (that's what the ASCII codes 48, 48, 50, 50, 67, 69, 65, 66 show) [image] you need to figure out how the check sum is calculated

so from the spec (thanks @gcjr ) the cksum is basically the ASCII representation of the XOR of all the hex bytes formed with the ASCII representation) (version and data) 83hex ^ 00hex ^ 22hex ^ CEhex ^ ABhex ➜ C4hex [image]

i'm confused. is the actual rfid tag a 26 bits ( Wiegard format ) and the 14 bytes (ASCII) the output from the rfid reader presenting the 6 byte value to the user?

RDM6300 reading format

Projects Programming

J-M-L January 3, 2023, 10:53am 4

the tag ID seems to be 14 bytes, starting with 2 and ending with 3. So you need 12 bytes in between.
I've no clue what you mean by

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RDM6300 reading format

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