Appendix B. Wiegand Specification - Promag WEC200 User Manual

Appendix B. Wiegand Specification

Data Pulses
The Data One and Data Zero signals are normally held at a logic high level until the data is ready to be sent. Data is sent as below on
Data1 or Data0 lines. The following timing parameters shall be observed:
Data One
Voh
Vol
Data Z ero
Voh
Vol
Tpw Pulse Width Time -- 20µSec (minimum) to 100µSec (maximum)
Tpi Pulse Interval Time -- 200µSec (minimum) to 20mSec (maximum)
Wiegand interface (26-bit format):
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
P S S S S S S S S C C C C C C C C C C C C C C C C P
P E E E E E E E E E E E E
Summed for even parity (E)
Wiegand interface (30-bit format):
1 2 3
P S S S S S S S S C C C C C C C C C C C C C C C C C C C C P
P E E E E E E E E E E E E E E
Summed for even parity (E)
Wiegand interface (34-bit format):
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
P S S S S S S S S S S S S S S S S C C C C C C C C C C C C C C C C P
P E E E E E E E E E E E E E E E E
Summed for even parity (E)
Tpw
Tpi Tpw
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Tpw
Tpi
O O O O O O O O O O O O P
Summed for odd parity (O)
O O O O O O O O O O O O O O P
Summed for odd parity (O)
O O O O O O O O O O O O O O O O P
Summed for odd parity (O)
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