MagTek MagneSafe V5 - Manual (Page 19)

Section 2. Communications
11
Track 3 Encrypted Data Length
This one-byte value indicates the number of bytes in the Track 3 encrypted data field. The field
is always a multiple of 8 bytes in length. This value will be zero if there was no data on the track
or if there was an error decoding the track. Once the encrypted data is decrypted, there may be
fewer bytes of decoded track data than indicated by this field. The number of bytes of decoded
track data is indicated by the Track 3 Absolute Data Length field.
Track 1 Absolute Data Length
This one-byte value indicates the number of useable bytes in the Track 1 Encrypted Data filed
after decryption.
Track 2 Absolute Data Length
This one-byte value indicates the number of useable bytes in the Track 2 Encrypted Data filed
after decryption.
Track 3 Absolute Data Length
This one-byte value indicates the number of useable bytes in the Track 3 Encrypted Data filed
after decryption.
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 (see Appendix E. Identifying ISO/ABA and
AAMVA Cards for ISO/ABA description)
1 AAMVA AAMVA encode format (see Appendix E. Identifying ISO/ABA and
AAMVA Cards for AAMVA description)
2 Reserved
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 reader was
powered on. This reader only sends an Input report when a card has
been swiped so this value will never occur.
Encrypted Track Data
If decodable track data exists for a given track, it is located in the Track x Encrypted Data field
that corresponds to the track number. The length of each Encrypted Data field is fixed at 112
bytes, but the length of valid data in each field is determined by the corresponding Encrypted
Data Length field that corresponds to the track number. Data located in positions greater than
the encrypted 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