MagTek HALF CARD PORT - Manual (Page 24)

Half Card Port Powered Insertion Reader
16
An example of a card insertion or removal is as follows when the Back Sensor is first blocked by
the card:
STX ESC 1 CR ETX
Optional
Where 1 indicates Sensor blocked; 0 indicates the sensor became unblocked.
The following is an example of a good read on withdrawal of a card:
STX ESC % Track 1 Data ? ; Track 2 Data ? 0 CR ETX
Optional
Where 0 indicates the sensor unblocked.
The following is an example of a bad read on Track 1 and a good read on Track 2 on withdrawal
of a card:
Where
STX ESC % E ? ; Track 2 Data ? 0 CR ETX
Optional
E (0x45) = Error
Track 2 Data = Good read Track 2 Data
0 = Sensor unblocked