There's an anti-collision system which is used to inventory all tags in the field of view of a reader. On the order of 500+ tags per second can be picked up by

There's an anti-collision system which is used to inventory all tags in the field of view of a reader. On the order of 500+ tags per second can be picked up by a single reader. For more details, see the GS1 spec, page 49 or so http://www.gs1.org/sites/default/files/docs/epc/uhfc1g2_1_2_0-standard-20080511.pdf http://www.gs1.org/sites/default/files/docs/epc/uhfc1g2_1_2_...