90-millimeter Compatible Swipe Reader
DATA
The Data signal is valid while the strobe is low. If the Data signal is high, the bit is a zero. If the
Data signal is low, the bit is a one.
STROBE
The Strobe signal indicates when Data is valid. It is recommended that Data be loaded by the
user with the leading edge (negative) of the Strobe.
CARD PRESENT
Card Present will go low after 14/15 flux reversals from the head. Card Present will return high
150 milliseconds after the last flux reversal.
When no card is being moved through the unit, the Data, Strobe, and Card Present signals are
high. The signal timing diagram shown above represents the data along with other signals that
are generated during the reading process.
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