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How can I Write Data on UHF RFID tags?
May 29, 2018

How can I Write Data on UHF RFID tags?


Depending on your budget, it may be much simpler to purchase an RFID reader (which is also a writer) than to make one. There are many great readers on the market with fairly easy to use APIs. Also, most of the major UHF RFID readers work with a common standard called LLRP (Low Level Reader Protocol); so, you can write one set of code and it will work with any reader that supports LLRP. The vast majority of UHF RFID tags work on the gen2 protocol (ISO 18000-6C), so just be sure your reader/writer does as well.


Assuming you are using a gen2 RFID tag, writing to the tag is fairly simple. You simply tell the reader (via a command) to encode the tag. Of course, there are a few considerations to note such as encoding must be in hexadecimal format and there are a few different memory blocks on the tag - EPC, Reserved, TID, and User. (Note: you can't encode to all memory blocks.)


Another thing to consider is how much data you would like to encode to the tag. The two primary memory blocks you'll be using are the EPC (typically 96 bits, but, on some tags, this number can be higher) and User (about 512 bits is standard, but there are some gen2 tags on the market that have much higher User memory).





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