How do I stop an RFID tag from reading more than once in flash?

Hi,

This is a feature of RFID tags - by design.

I doubt it can even be programmed to ignore it.

You need to test the RFID tag packet ID number and if flagged (by you as processed), then do nothing more with the info.

Or respond and start another 3 sec cycle.

I believe the 3 sec quiet time starts at random time (in milliseconds) so all tags (imagine a pallet) responding at the exact time. Again network collision detection methodology.

You might not want to assume that tags only get read once too. What happens when something tagged leaves the area?

With two readers, you could determine direction.

FYI - This is just another form of network traffic - tags and readers all share the (bus) air waves.

Some instances have multiple readers to receive the same tag's signals too through a given portal in some installations.

There are middle ware servers just designed to manage this type of traffic from high volume RFID installations.

Jim Wiley