On arduino, one mifare card, was different UID. Read with mfrc522: 30166134113 (DEC) with Wiegang 34: 1904649758 (DEC) Possible convert UID from Wiegang 34, to mfrc522 code ?
Wiegand 34 readers vs MFRC522. Different card Uid
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So the answer it seems is that some readers return the bytes in the reverse order which causes the decimal conversion to be vastly different.