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In this manner the user can select to use the UID (serial number) or user programmed
information within a memory block as the base data for the Wiegand output. The complete
data frame is output whenever the tag is within the RWD’s antenna field and the tag has been
validated. This output is independent of the normal TTL serial interface which responds to
received commands and replies with the data as requested.
The physical Wiegand protocol is asynchronously transmitted as low going 50 μ S pulses on
the appropriate DATA low or DATA high pins. These pulses are separated by 2mS periods.
The Wiegand sequence is output a single time whenever a valid tag enters the RF field for the
first time. (NO Wiegand output if AUX OUTPUT parameter is ZERO/OFF).
Wiegand Protocol Timing Diagram
50 μ S pulse
DATA High
DATA Low
2mS pulse intervals
5v
0v
5v
0v
TTL level
DATA
1
0
1
0
23
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