03-01-2018, 10:53 PM
(03-01-2018, 03:51 PM)bgb_ca Wrote:(03-01-2018, 02:06 PM)KevinL Wrote: Pro tip: don't have any other RFID cards, particularly Presto, in your hand at the same time, or the machine will misread.
This is because Presto and EasyGO use the same card technology, MiFare DESFire. If the cards used a different technology it would not happen.
It will likely happen if you use a card from another region as well. I believe Montreal also uses MiFare cards, which would result in the same conflict.
That shouldn't matter at all. I work with card readers for a living and a Mifare reader will happily detect multiple cards in the read field and individually address them by Unique ID to read their application directory. It shuts down each wrong card it comes across until it's talking to the one with the application it wants, then carries out its dialog with that card only.
If the presence of other ISO14443 based cards is messing it up it's either because there are more than it can energize simultaneously (it should do at least three, I've seen a reader identify up to six at once) or they've implemented it wrong. Mifare, Mifare Ultralight, Mifare DESfire, NXP Smart MX (the basis for Interac, Visa, and MasterCard contactless payment), and NFC on mobile devices are all ISO14443 based and can coexist in the same read field simultaneously.
...K