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- Convert the Masked Card Data to Hex.
- Calculate the length by totaling Card Data / 2 and then converting it to Hex and reversing it. So if the length is 498 / 2 = 249. 249 in hex is 00F9. The characters are swapped when in the IDTech read, so it must be put in as F900 rather than 00F9.
- Calculate the LRC using only the <CardData>
- Calculate the Checksum using only the <CardData>
- String it together as follows <’02’><HexLength><CardData><LRC><CheckSum><’03’>
I made a small edit to test if notifications go out properly to watchers of this page.
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