MagTek USB INSERTION READER - Manual (Page 25)

Section 4. USB Communications (HID)
17
TRACK 1 DATA LENGTH
This one byte value indicates how many bytes of decoded card data are in the track 1 data field.
This value will be zero if there was no data on the track or if there was an error decoding the
track.
TRACK 2 DATA LENGTH
This one byte value indicates how many bytes of decoded card data are in the track 2 data field.
This value will be zero if there was no data on the track or if there was an error decoding the
track.
TRACK 3 DATA LENGTH
This one byte value indicates how many bytes of decoded card data are in the track 3 data field.
This value will be zero if there was no data on the track or if there was an error decoding the
track.
CARD ENCODE TYPE
This one byte value indicates the type of encoding that was found on the card. The following
table defines the possible values.
Value Encode Type Description
0 ISO/ABA ISO/ABA encode format
1 AAMVA AAMVA encode format
2 CADL No longer supported
3 Blank The card is blank
4 Other The card has a non-standard encode format. For example, ISO/ABA
track 1 format on track 2.
5 Undetermined The card encode type could not be determined because no tracks could
be decoded.
6 None No decode has occurred. This type occurs if no magnetic stripe data
has been acquired since the data has been cleared or since the device
was powered on. This device only sends an Input report when a card
has been swiped so this value will never occur.
TRACK DATA
If decodable track data exits for a given track, it is located in the track data field that corresponds
to the track number. The length of each track data field is fixed at 110 bytes, but the length of
valid data in each field is determined by the track data length field that corresponds to the track
number. Track data located in positions greater that the track data length field indicates are
undefined and should be ignored. The HID specification requires that reports be fixed in size,
but the number of bytes encoded on a card may vary. Therefore, the Input Report always
contains the maximum amount of bytes that can be encoded on the card and the number of valid
bytes in each track is indicated by the track data length field. The track data is decoded and
converted to ASCII. The track data includes all data starting with the start sentinel and ending
with the end sentinel.