MagTek MT-211232 RS-232 1 OR 2 TRACK - Manual (Page 25)

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SECTION 3. OPERATION
Included in this section are Indicators, Card Read, Reader to Host Message Format, Host to
Reader Commands, a timing diagram of transmission, and the top assembly drawing of the
Reader.
INDICATORS
A card may be swiped through the Reader slot when the green LED is lit. The magnetic stripe
must face toward the front (the side with the LED and arrows) and may be swiped from either
direction.
In the unbuffered mode (SWB2 OFF), the green LED will go out momentarily when a properly
encoded card is swiped through the Reader. The green LED will reappear when all valid
information is transmitted to the computer and the Reader is ready to accept another card. In the
buffered mode (SWB2 ON), when a card is swiped, the green LED will go off and remain off
until a Release Command is received (See Buffer Mode Commands below).
The red LED goes ON momentarily when an error occurs during a card read. If the unit was
installed correctly, the error will probably be caused by not swiping the card correctly or the
problem may be with the encoding on the card. Swipe the card again or try another card.