基于两级索引的IC卡终端设备状态定位方法

The State Location of IC Card Terminal Device Based on Two Stage Index

针对由不同类型的IC卡终端设备组成的一卡通系统,下位机的状态对于系统至关重要。论文在建立终端设备状态表的基础上,提出了基于两级索引机制的终端设备状态定位算法。算法使用设备编号作为关键字,用压缩BCD码表示四位的设备编号被分成两部分,前两位与后两位分别形成索引,根据状态表中的索引值来快速定位相应设备状态信息,从而得到相应的设备状态信息。

The state of terminal device is critical to IC card system which consists of different kinds of terminal device.The paper introduce the structure of terminal device table and present a state location of IC Card terminal device based on two stage index strategy. As a keyword , the device number is a four bit compressed BCD code. The device number is divided two parts, the previous two-bit and last two-bit correspond two index.The device state information can be located according to the index information is a fast way.