Certificate & Operation Manual
Depending on the selected operation mode one of Wiegand interface formats supported
by the reader is used for connection with external controller.
Read
synchronously, at the moment of
propriate value in coded mark.
ion received from identifier.
ark:
If the input coded mark from identifier is shorter than output the missing high-order
bits are padded with zeros.
er can be simultaneously used with controllers of different types.
4.3. Operation of the reader under Wiegand interface
Data is transmitted to the external controller at one time, a
first positive signal receipt from identifier. Repeated data transfer is possible not earlier
than 200 ms after identifier leaves stable reception zone.
Two wires are used for transmission: «data 0» and «data 1». Occurrence of logic level «0»
on one of the wires signals the presence of bit with ap
The length of the coded mark depends on the set mode at assembly and can be fixed or
specified by data dimens
Following rules apply at the difference between coded mark received from identifier and
the output coded m
If the input coded mark from identifier is longer than output the excessive high-order
bits are truncated.
Figure 2. Formation of output reader signals and their diagrams
Data is transmitted with high-order bits forward.
The
s are
presented in Figures:
The identifier encoded signal includes the even number of bits (N/2 – integer)
structure of coded mark and order of parities in it for fixed length format
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