TDSi DIGIgarde PLUS - Wiegand Format; Table 20 Wiegand Pulse Characteristics

Appendices
DIGIgarde PLUS User Guide
Copyright © 2012 TDSi Last Change
Page 62 13 May, 2016
9.2
9.29.2
9.2 Wiegand
Wiegand Wiegand
Wiegand f
ff
format
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The figure below displays the timing pattern for data bits sent by the reader to the
access control panel. This timing pattern falls within the Wiegand guidelines as
proscribed by the SIA's Access Control Standard Protocol for the 26-Bit Wiegand
Reader Interface (a Pulse Width time between 20µs and 100µs, and a Pulse
Interval time between 200µs and 20ms). The Data 1 and Data 0 signals are held at
logic high level (above the Voh level) until the reader is ready to send a data
stream. The reader places data as asynchronous low-going pulses (below the Vol
level) on the Data 1 or Data 0 lines to transmit the data stream to the access
control panel. The Data 1 and Data 0 pulses will not overlap or occur
simultaneously. Table 1 provides the minimum and maximum allowable pulse
width times (the duration of a pulse) and pulse interval times (the time between
pulses),
Table 20 Wiegand pulse characteristics
Symbol Description Reader typical Time
Tpw Pulse Width Time 100µm
Tpi Pulse interval time 1ms
Figure: Time
9.2.1
9.2.19.2.1
9.2.1 Wiegand format
Wiegand format Wiegand format
Wiegand format
F Series Fingerprint Access Control Wiegand format is a general Access Control
protocol.