MagTek USB HID SURESWIPE & USB HID SWIPE READER - Manual (Page 17)

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SECTION 3. OPERATION
This section describes the LED Indicator and Card Read.
LED INDICATOR
The LED indicator will be either off, red, or green. When the device is not powered, the LED
will be off. When the device is first plugged in, the LED will be red. As soon as the device is
plugged in, the host will try to enumerate the device. Once the device is enumerated the LED
will turn green indicating that the device is ready for use. When a card is being swiped, the LED
will turn off temporarily until the swipe is completed. If there are no errors after decoding the
card data then the LED will turn green. If there are any errors after decoding the card data, the
LED will turn red for approximately two seconds to indicate that an error occurred and then turn
green. Anytime the host puts the device into suspend mode, the LED will turn off. Once the
host takes the device out of suspend mode, the LED will return to the state it was in prior to
entering suspend mode.
CARD READ
A card may be swiped through the Reader slot when the LED is green.
When using a USB HID Swipe Reader (with a single head), the magnetic stripe must face toward
the front (the side with the LED) and may be swiped in either direction.
When using a USB HID SureSwipe reader (with dual heads), the magnetic stripe can face toward
the front or the back, and may be swiped in either direction.
If there is data encoded on the card, the reader will attempt to decode the data and then send the
results to the host via a USB HID input report. After the results are sent to the host, the device
will be ready to read the next card.