识别卡.财务事项卡片.3磁道用磁卡条纹数据内容

[中文适用范围]： 该国际标准制定了使用磁道 3 的金融交易卡的规范，旨在允许基于磁条编码信息的使用进行交换。 它规定了磁道3上读/写信息的数据内容和物理位置，并与ISO/IEC 7811和ISO/IEC 7812的相关部分结合使用。 [外文原描述]： ISO/IEC 4909:2006 establishes specifications for financial transaction cards using track 3 and is intended to permit interchange based on the use of magnetic stripe encoded information. It specifies the data content and physical location of read/write information on track 3 and is to be used in conjunction with the relevant parts of ISO/IEC 7811 and ISO/IEC 7812. ISO/IEC 4909:2006 recognizes the need for formats of track 3 which can be used independently of, or in conjunction with, track 2 as defined in ISO/IEC 7813. This approach is intended to permit the greatest degree of flexibility within the financial community in facilitating international interchange. Using track 3 in conjunction with track 2 is a mode of operation in both on-line and off-line interchange environments. This mode of operation requires that the original encoded data on track 2 be read; the data on track 3 be read; and, if update is required, all the data on track 3 be rewritten. Independent use of track 3 is an alternative mode of operation permitting both on-line interchange and off-line interchange based on mutual agreement between interested parties. It requires reading only of the data on track 3 and, if update is required, the rewriting of all the data on track 3.