Single, FIFO, Multiple, and Selective Access Functions
Section 3-1
3-2
3-1 Single, FIFO, Multiple, and Selective Access Functions
This Reader/Writer has four communication modes to be selected by each
command corresponding to the number and/or state of Tags in the
communication area. In addition, two operating modes (ISO and I.CODE1
modes) are provided, each of which can be selected according to the readout
chip to be used.
For the details and the way to use each of the modes, see the item 5-8
“Communications Phase.”
For the details of the operating mode, see the item 4-1-2 “Chip Operating
Mode Setting.”
3-1-1 Single Access Mode
When operating in single access mode, be sure to have only one Tag in the
communications area.
The presence of more than one Tag in the communications area will result in
a communications error.
3-1-2 FIFO Access Mode
FIFO stands for First In First Out.
In the FIFO (first-in, first-out) Access Mode, the RFID System reads and
writes data to and from each Tag coming into the communications area one
after another.
Since every Tag finished with communications is set to access prohibit,
communications will be possible if only one Tag newly arrives in the
communication area of the Antenna where more than one Tag exists.
An error results, however, if two or more Tags arrive in the communications
area simultaneously. Once an access-prohibited Tag leaves the
communications area, access to the Tag is enabled again.
