Radiofrequency identification of animals — Part 7: Synchronization of ISO 11785 identification systems
动物的射频识别第7部分:ISO 11785识别系统的同步
发布日期:
2012-12-03
ISO 24631-7:2012规定了在读取符合ISO 11784和ISO 11785的个体动物识别中使用的收发器时同步RFID收发器的规则和程序。
本文所述的同步方案可以在每个读卡器内完全实现,并且当连接到同步总线时,这些读卡器创建一个对等网络(所有读卡器都是平等的?没有专用的主机)。此外,还可以使用专用的、特定于制造商的同步接口将读卡器集群添加到总线上,读卡器集群可以是主/从配置。同步接口向同步总线呈现与单个对等读卡器相同的电气特性。
收发器一致性标准ISO 24631-2允许激活开/关定时公差为?0/+1 ms,因此为读卡器制造商提供了检测HDX报头首选方法的选项;
部分或全部。然而,在同步读卡器时,无论使用哪种报头检测方法,所有读卡器都必须严格遵守时序图中给出的特定时序和时序公差,这一点至关重要。
还应特别注意故障诊断,当读卡器网络由不同制造商的产品组成时,故障诊断变得更加重要。最明显的情况是,作为网络一部分的读卡器已经分离,例如同步电缆断开,并且它认为自己现在是独立的,因此允许异步操作,从而损害所有其他读卡器。
ISO 24631-7:2012 specifies rules and procedures for synchronizing RFID transceivers while reading transponders used in individual animal identification complying to ISO 11784 and ISO 11785.
The synchronization scheme described herein may be fully implemented within each reader, and such readers when attached to the synchronization bus create a peer-to-peer network (all readers are equal?there is no dedicated master). Additionally, a cluster of readers, which could be in a master/slave configuration, may also be added to the bus using a dedicated, manufacturer specific Synchronization Interface. The Synchronization Interface presents to the synchronization bus electrical characteristics identical to those of a single peer-to-peer reader.
The transceiver conformance standard ISO 24631-2 permits activation on/off timing tolerances of?0/+1 ms and therefore gives reader manufacturers options as to their preferred method for detecting the HDX header; partial or full. However, when synchronizing readers, irrespective of which header detection method is used, it is critical that all readers adhere strictly to the specific timings and timing tolerances as given in the timing diagrams.
Particular attention should also be given to fault diagnostics which becomes more important when a reader network comprises products from different manufacturers. The obvious case is where a reader which is part of a network has become detached e.g. sync cable break, and it considers it's self to be now standalone and thus permitted to operate asynchronously to the detriment of all other readers.