Compaq 99875320-5 - Manual (Page 21)

Section 4. USB Communications
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 CADL encode format. Note that this reader can only read track
2 for this format. It cannot read tracks 1 and 3. However, this
format is obsolete.
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.
7 JIS Type 2 JIS Type 2 encode format. Before this encode type can be
decoded, decoding must be enabled with the decode enable
property. The JIS type 2 decoding option was not added until
firmware with software ID 21042812K01 was release in October
2008.
TRACK DATA
If decodable track data exists 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 than 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.
TRACK 1 DATA
This field contains the decoded track data for track 1.
TRACK 2 DATA
This field contains the decoded track data for track 2.
TRACK 3 DATA
This field contains the decoded track data for track 3.
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