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BlogsAsk The Experts ForumHow Would I Build an RFID Interface?

How Would I Build an RFID Interface?

Posted By RFID Journal, 05.15.2013

Is there a standardized way of creating one?

—Name withheld


I assume you are asking how you would build a link between a radio frequency identification reader and a back-end system, and that would depend on the type of RFID system you deploy. Passive ultrahigh-frequency (UHF) readers based on the second-generation Electronic Product Code (EPC) air-interface protocol often employ a GS1 standard called the low-level reader protocol (LLRP), which specifies the interface between readers and applications. If you are using an EPC system, follow LLRP.

Most other systems do not have a standardized way of creating an interface. Different interrogators output data in different formats—XML or plain text, for example. You will need to build a custom interface that imports this information, formats it and then shares it with back-end systems in a useable format. If you are not utilizing an EPC solution, I suggest that you consult with the company that manufactures the readers you are using.

—Mark Roberti, Founder and Editor, RFID Journal


Ken Traub 2013-05-17 04:21:07 AM
What Mark writes about LLRP is accurate. However, LLRP is not necessarily the best interface for an application to use. As the name suggests, LLRP is a "low level" interface designed to give full control over all of the nuances of reader operation. For programming at an application level, the Application Level Events (ALE) standard is a much more appropriate and easier to use interface. ALE is designed so that an application says what information it wants from readers, and the ALE implementation figures out the best way to control the readers to get that information. Some readers support ALE natively; in other cases an external software package provides ALE to applications and speaks LLRP over the network to control the readers.

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