User's Manual

10
SIA recommended cable type for Wiegand signals
Cable Length Cable Diameter
inch
Diameter
mm
Up to 61m (200.1 ft) AWG22 0.025 0.64
Up to 91m (301.8 ft) AWG20 0.03 0.82
Up to 153m (502 ft) AWG18 0.04 1.02
Recommended cable for clock and data ABA track 2
emulation: Up to 25 meter (82 foot), AWG22.
Wiegand Signal Levels
Voh = Output Voltage idle high
Vol = Output Voltage active low
Reader output interface and pull-up resistors
The SmartID readers provided true open collector
outputs for Wiegand/Clock&Data ABA track 2
emulation. This means the data output is
not voltage driven.
External pull-up resistors are required when the
controller does not provide internal pull-up resistors.
The typical value for the pull-up resistors is 1 kOhm.
The recommend position to place the pull-up
resistors is at the controller side.
The pull-up resistor #1 connects form Data/D1 (reader
connector pin 3) to a 5 Volt reference.
The pull-up resistor #2 connects form Clock/D0
(reader connector pin 4) to a 5 Volt reference.