MagTek Bluetooth MagneSafe V5 Swipe Reader - Manual (Page 23)

Section 5. Communications
15
All fields with the format P## are programmable configuration property numbers. They are
described in detail later in this document.
Masked Track Data
If decodable track data exists for a given track, it is located in the Masked Track Data field that
corresponds to the track number. The length of each Masked Track Data field is fixed at 112
bytes, but the length of valid data in each field is determined by the Masked Track Data Length
field that corresponds to the track number. Masked Track Data located in positions greater than
indicated in the Masked Track Data Length field are undefined and should be ignored.
The Masked Track Data is decoded and converted to ASCII and then it is “masked.” The
Masked Track Data includes all data starting with the start sentinel and ending with the end
sentinel. Much of the data is “masked;” a specified mask character is sent instead of the actual
character read from the track. Which characters are masked depends on the format of the card.
Only ISO/ABA (Financial Cards with Format Code B) and AAMVA cards are selectively
masked; all other card types are either wholly masked or wholly clear. There is a separate
masking property for ISO/ABA cards and AAMVA cards. See the ISO Track Masking property
and the AAMVA Track Masking property for more information. Refer to Appendix E for a
description of how ISO/ABA and AAMVA cards are identified.
Each of these properties allows the application to specify masking details for the Primary
Account Number and Driver’s License / ID Number (DL/ID#), the masking character to be used,
and whether a correction should be applied to make the Mod 10 (Luhn algorithm) digit at the end
of the number be correct.
Track 1 Masked Data
This Simple ASCII field contains the Masked Track Data for track 1. All characters are
transmitted.
For an ISO/ABA card, the PAN is masked as follows:
The specified number of initial characters is sent unmasked. The specified number of
trailing characters is sent unmasked. If Mod 10 correction is specified, all but one of the
intermediate characters of the PAN are set to zero; one of them will be set such that the
last digit of the PAN calculates an accurate Mod 10 check of the rest of the PAN as
transmitted. If the Mod 10 correction is not specified, all of the intermediate characters
of the PAN are set to the specified mask character.
The Card Holder’s name and the Expiration Date are transmitted unmasked.
All Field Separators are sent unmasked.
All other characters are set to the specified mask character.
For an AAMVA card, the specified mask character is substituted for each of the characters read
from the card.