3-2 Communication Modes
3-2
3-4
3-2-3 Multiple Access
Multiple Access is used to read data from or write data on the Multiple
Tags in the Antenna Communication area simultaneously.
Communications with Multiple Tags in the communications area is
available. (This function is also called 1:N Access or Multiple Tag
Simultaneous Access). The execution timing can be selected from Trigger,
which executes immediately, or Repeat, which continues to wait for the
Tags to enter the communication area.
In I.CODE1 Mode, specify the appropriate tag-number code in command
data according to the number of Tags that exist in the communication
area (refer to SECTION 5-2-5).
The Duplicate Communication Protecting Function is useful for unstable
Tags in the Antenna Communication Area (refer to SECTION 3-8 for
details).
3-2-4 Selective Access
Selective Access is used to read or write data on specified Tags among the
multiple Tags in the communication area.
In ISO Mode, communication with specific Tags is achieved by first
reading the Tag UIDs (unique codes) in Multiple Access Mode and then by
specifying them. It is recommended that the UID/SNR addition option of
the Command Processing Procedure Setting should be used. It is
especially convenient since data readouts and UID acquisitions are
performed by a single command.
In I.CODE1 Mode, the Tag Detection Command that assigns numbers to
the Tags in the communication area in Multi Access Mode is performed
first, and then the Tag Designation Command that specifies the assigned
numbers is performed to launch the communication with the specific
Tags.
