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BlogsAsk The Experts ForumWould It Be Possible to Count Inventory With One Antenna and Write Data to the Tag With Another at the Same Time?

Would It Be Possible to Count Inventory With One Antenna and Write Data to the Tag With Another at the Same Time?

Posted By RFID Journal, 10.05.2017

For example, the Low-Level Reader Protocol (LLRP) standard says the commands are queued. Are there any devices with a proprietary application programming interface (API) that could fulfill them simultaneously?




It would not be possible to simultaneously read a tag's ID number and write to that tag. An antenna can only communicate with one reader at a time. The passive UHF Gen 2 RFID standard does allow for two sessions, enabling two separate readers to inventory tags. Reader #1 could communicate with a tag while it was in session A, then reader #2 could communicate with the tag once it switched to session B. However, I do not believe sessions would allow one reader to interrogate tags and another to write to them, because it would take more time and energy to write to the tag.

—Mark Roberti, Founder and Editor, RFID Journal


Jasper Pons 2017-10-15 06:31:19 AM
Most decent readers we have worked with have an option in the config and/or the reading and writing commands of the API to stipulate the antenna to use to perform the read or write. So programmatically we can tell the reader to read on one antenna and write on another antenna and switch between them a few times per second. I don't think it can be done simultaneously, but you could give the appearance of it being done simultaneously. Bear in mind that write operations generally take a few milliseconds longer than read operations so during the few milliseconds of the write operation it's likely that you will not be reading, however to a human observer it will indeed appear simultaneous.

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