2 NFC tags in the vicinity of the reader

[Fabrice Comby]

Posted on June 27, 2018 at 09:22

Hello,

I'd like to know what happen when to 2 tags of type 5 are in the vicinity of a reader ( par example a reader based on the X-NUCLEO-NFC05A1). The 2 tags can be detected simultaneously? Only the nearest tag will be detected? None of the tags will be detected because they will disturb each other?

#multiple-devices-simultaneously #nfc05 #tags-and-readers #nfc #tag-type-5

[Travis Palmer · Accepted solution]

Posted on June 27, 2018 at 13:50

Dear Fabrice,

Most NFC standards have a method implemented which is called anti-collision. 

In fact, physically two tags / VICCs are interfering with each other and the reader / VCD has to detect and solve this collision. The methodology to do so is described in the according standard.

Please have a look at ISO/IEC 15693-3:2009 - 'Anticollision and transmission protocol' (chapter 8. Anticollision) for further details.

This anticollision procedure is already part of our X-NUCLEO-NFC05A1 software, therfore our demo kit can detect multiple tags / VICCs in vicinity.

BR Travis

[Fabrice Comby]

Posted on June 28, 2018 at 10:29

Dear Travis,

Thank you for your answer.

I will try it