Promag WEC200 - Appendix B. Wiegand Specification; Wiegand Interface (26-bit Format); Wiegand Interface (30-bit Format); Wiegand Interface (34-bit Format)

17
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
Data Zero
Tpw Tpw
Tpw TpiTpi
Voh
Voh
Vol
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
O
O
O
O
O
O
O
O
O
O
O
O
P
Summed for even parity (E)
Summed for odd parity (O)
Wiegand interface (30-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
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
O
O
O
O
O
O
O
O
O
O
O
O
O
O
P
Summed for even parity (E)
Summed for odd parity (O)
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
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
P
Summed for even parity (E)
Summed for odd parity (O)