MagTek USB INSERTION READER - Manual (Page 19)

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SECTION 3. OPERATION
This section describes the card reading operation.
CARD READ
A card may be read by inserting it into the reader slot or removing it from the reader slot. The
direction of the read that is sent to the host is controlled by the MSR DIRECTION property,
which is described in the next section. The magnetic stripe must face toward a read head during
the insert operation. Once the card is swiped, the device will attempt to decode the data and then
send the results to the host via a USB HID input report or, if in Keyboard Emulation mode, as if
the data was being typed on a keyboard. After the results are sent to the host, the device will be
ready to read the next swipe. To help reduce read errors, if a good read occurs when the card is
inserted and a bad read occurs when the card is removed, then the read data for the card insert
will be sent to the host when the card is removed instead of the bad read data from the removal.