Understanding Card Data Formats - HID Global

• The number of bits does not indicate the format except for standard 26-bit. For example, there are over 100 different 34-bit formats alone. • Within a given bit length (34-bit, 37-bit, etc.), the size and location of each data element may change. For example: o One 34-bit format may have an 8-bit Facility Code starting with bit #2. ................
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