How do wiegand device really works?
* 26-Bit Wiegand Format: 
* Bit 1 = Even Parity over Bits 2 - 13
* Bits 2 - 9 = Facility Code (0 to 255) Bit 2 is MSB
* Bits 10 - 25 = ID Number (0 to 65,535) Bit 10 is MSB
* Bits 26 Odd parity over bits 14 to 25


ref

Parity is not passed thru. Rather error messages on length are sent from reader.