信息技术.项目管理的射频识别.第2部分:135KHz以下的空中接口通信用参数

[中文适用范围]： ISO/IEC 18000 的这一部分定义了用于物品管理应用的低于 135 kHz 的射频识别 (RFID) 设备的空中接口。其目的是为 RFID 设备提供通用技术规范，以实现兼容性并鼓励产品在国际市场上不断增长的 RFID 市场中实现互操作性。本部分定义了技术属性的前向和返回链路参数，包括但不限于工作频率、工作通道精度、占用通道带宽、杂散发射、调制、占空比、数据编码、比特率、比特率精度、比特传输顺序。它进一步定义了空中接口中使用的通信协议。本部分包含两种类型。参数表中显示了各类型之间的详细技术差异。ISO/IEC 18000 的这一部分规定了用于阅读器和标签之间通信的物理层。协议和命令在多个标签中检测一个标签并与之通信的方法（“防碰撞”）它规定了两种类型的标签：A 型 (FDX) 和 B 型 (HDX)。这两种标签仅在物理层上有所不同。两种标签均支持相同的防碰撞和协议。FDX 标签始终由阅读器供电，包括在标签到阅读器的传输过程中。它们的工作频率为 125 kHz。HDX 标签由阅读器供电，标签到阅读器的传输过程中除外。它们的工作频率为 134.2 kHz。附件 B 中描述了一种替代工作频率。附件 D 中描述了一种可选的防碰撞机制。 [外文原描述]： ISO/IEC 18000-2:2004 defines the air interface for radio-frequency identification (RFID) devices operating below 135 kHz used in item management applications. Its purpose is to provide a common technical specification for RFID devices to allow for compatibility and to encourage inter-operability of products for the growing RFID market in the international marketplace. ISO/IEC 18000-2:2004 defines the forward and return link parameters for technical attributes including, but not limited to, operating frequency, operating channel accuracy, occupied channel bandwidth, spurious emissions, modulation, duty cycle, data coding, bit rate, bit rate accuracy, bit transmission order. It further defines the communications protocol used in the air interface. ISO/IEC 18000-2:2004 contains two types. The detailed technical differences between the types are shown in the parameter tables. ISO/IEC 18000-2:2004 specifies the physical layer that is used for communication between the interrogator and the tag;the protocol and the commands;the method to detect and communicate with one tag among several tags ("anti-collision"). It specifies two types of tags: Type A (FDX) and Type B (HDX). These two types differ only by their physical layer. Both types support the same anti-collision and protocol. FDX tags are permanently powered by the interrogator, including during the tag-to-interrogator transmission. They operate at 125 kHz. HDX tags are powered by the interrogator, except during the tag-to-interrogator transmission. They operate at 134,2 kHz. An alternative operating frequency is described. An optional anti-collision mechanism is also described.