User's Manual

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.
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