The format below is based on information from Priority 1 Design.
FDX-B, is an Animal Identification data format covered by ISO 11784/5 and normally operates at 134.2 KHz, which is slightly higher then the 125KHz RFID tags. It uses ASK modulation with BI-Phase encoding.
The decoded data is a 128bit bit stream structured as follows:
Decoding Example
Pulse lengths:
18/23/20/45/22/22/19/23/21/23/20/24/20/22/19/23/21/23/20/24/20/22/21/21/42/26/19/24/19/23/19/45/22/23/41/45/43/46/42/45/43/25/20/44/42/25/20/45/42/45/43/46/22/22/40/26/19/24/20/23/19/44/22/23/20/23/21/22/20/23/20/23/20/24/20/22/20/24/40/26/19/24/19/23/20/22/21/23/20/24/19/45/21/22/42/25/19/24/20/43/44/25/18/45/42/46/43/24/20/22/21/23/20/24/19/23/20/22/21/23/20/24/19/45/22/21/21/23/20/22/21/23/20/22/21/23/20/23/42/45/21/23/21/22/42/45/22/22/21/22/42/45/43/25/19/45/22/21/21/23/20/23/20/23/41/46/42/25/20/23/19/24/20/23/20/23/20/23/21/22/20/23/20/44/23/22/19/24/20/22/21/23/20/23/19/24/20/22/21/23/42/24/19/24/19/23/21/23/20/22/21/23/19/23/21/23/20/44/22/21/21/23/21/23/19/23/21/22/20/24/20/23/19/23/21/22/20/24/41/24/20/24/19/23/20/45/22/21/42/46/43/45/42/46/43/25/19/44/43/25/20/43/43/46/43/45/22/21/42/26/19/24/19/23/19/45/22/23/20/22/21/22/20/23/21/23/20/23/20/22/20/24/41/26/19/23/19/23/
BiPhase Converted:
00100000000001000101111111011011111010001000000001000000101001101111000000001000000011001100111010000111000000001000000001000000001
RAW Read:
0000000000 1 00010111 1 11101101 1 11101000 1 00000000 1 00000010 1 00110111 1 00000000 1 00000001 1 00110011 1 01000011 1 00000000 1 00000000 1 00000000 1
Start header removed:
00010111 1 11101101 1 11101000 1 00000000 1 00000010 1 00110111 1 00000000 1 00000001 1 00110011 1 01000011 1 00000000 1 00000000 1 00000000 1
Control Bits removed:
00010111 11101101 11101000 00000000 00000010 00110111 00000000 00000001 00110011 01000011 00000000 00000000 00000000
Tag Number: 00010111 11101101 11101000 00000000 000000 => 000000 00000000 00010111 10110111 11101000 => 00001554408
Country Code: 10 0011 0111 => 1110110001 => 945
Final Reading: 94500001554408
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