Track 3 is not currently used by any national bank card issuer. Track 3 has the same properties as track 1 (start and end sentinels and an LRC byte), except that there is no standard for the data content or format. Track 3 is used to store the enciphered PIN, country code, currency units, amount authorized, subsidiary account information, and other account restrictions. It is 210bpi with room for 107 numeric digits. The difference is its read/write ability. Track 3 is also used for financial transactions. Track 2 is encoded with a 5-bit scheme (4 data bits plus one parity bit.) To convert this data into ASCII, add 0x30 to each byte.Ĥ bytes (YYMM) or the one byte separator if a non-expiring card It is 75bpi with room for 40 5-bit numeric characters. Track 2 was developed by the American Bankers Association (ABA) for on-line financial transactions. (It’s odd, just like any other single byte’s parity bit.) The LRC’s parity bit is not the sum of the parity bits of the message, but only the parity bit for the LRC character itself. That means that the total of all the bit 1s of each byte has to come out to an even number.
The LRC is made up of parity bits for each “row” of bytes, making the total even. Optional data can be encoded here by the issuer.ġ byte. (The United States is 840) This is only used if the account number begins with “59.”Ĥ bytes (YYMM) or the one byte separator if a non-expiring card. American Express inserts space characters in here in the same places the digits are broken up on the face of your card.ģ bytes, if used.
1 byte alpha (The standard for financial institutions specifies format code is “B”)
0 kommentar(er)
