Tham khảo tài liệu 'sustainable rfid solutions part 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 164 Sustainable Radio Frequency Identification Solutions software components were vendor specific interoperability was also hard to achieve. Using the pharmaceutical packing use case as an example early solution providers would have a very limited repertoire of low-level software components. For every new deployment of the same use case whether it is for a different customer or for a different location of an existing customer a lot of resources are required to re-engineer a solution sometimes almost completely from scratch due to the inevitable variations present in the new environment. Clearly this is not cost-effective and would become a major impediment to the wide adoption of RFID. Many of these issues are addressed by open standardizations such as EPCglobal. Fig. 3 shows various EPCglobal standards that are applicable to components in the packing process. In the figure the simplified packing process flow is spread across three layers at the bottom is the device layer where the focus is on controlling the device infrastructure to facilitate reliable data collection. In the example packing process this layer is responsible for turning on the reader for data collection when a case approaches detecting when the case has left read zone and aggregating tags collected and sending them to next layer. Components in this layer also interact with other types of sensors and actuators in addition to RFID readers. For example motion detectors various types of displays or controls that start stop conveyer. For example if tag counts do not match the conveyer is stopped so that the offending case can be subjected to manual inspection later. The tag data from the device layer flow into components in the filtering and collection layer. Filtering and collection capabilities are essential features of every RFID based supply chain use case. The Application Level Events ALE specification which provides for a standard way to declaratively specify filtering and collection requirements
