User's Manual

5-2 Control Procedures for Each Communication
5-2
5-5
The operating sequences including the communication with the Tag or timing for returning the response
vary, depending on the communication mode. The communication mode is set by specifying the
communication mode in the command data. The access and mode specified as the communication settings
must be those specifiable for each Tag status in the specified antenna’s communication area or the
connection topology with the host. This section describes these access and mode settings.
5-2-1 Single Access
In single access, a single Tag can exist in the communications area. The presence of two or more Tags in
the communications area causes a communications error.
5-2-1-1 Single Trigger mode
Single Trigger mode is used when a single Tag is present in a resting condition in the antenna
communication area. If the Tag does not exist in the antenna communication area, No Tag
Error is returned.
Trigger command
(Host) (Reader/Writer) (Tag)
Yet to enter
Communications Tag
Tag
(Stationary)
(Stationary)
Send a response
Command end
(1) Sends a commands if a Tag is in the R/
W
A
ntenna’s communication range.
(2) The Reader/Writer communicates
according to the command.
(3) On completion of communications, the
Reader/Writer returns a response to the
host.
5-2-1-2 Single Auto Mode
The Reader/Writer waits until the Tag has entered the antenna communication area and
executes the command it received from the host. When the Reader/Writer receives Auto
Command, it enters the busy state until the communication with the Tag has been completed,
during which it does not accept any commands other than Stop Command (ST) and Reset
Command (XZ).
Auto command
(Host) (Reader/Writer) (Tag)
Waits for a Tag to enter Yet to enter
Busy
Command end
Communications process
Tag
Passes
Send a response
(1) The Reader/Writer receives
a command.
(2) It waits for a Tag to enter the
R/W Antenna’s communication
area.
(3) When a Tag enters the area,
it communicates with the Tag.
(4) On completion of communications,
it returns a response to the host.
Busy
Waits for a Tag to enter
Yet to enter