User's Manual

5-2 Control Procedures for Each Communication
5-2
5-9
5-2-2-2 FIFO Auto Mode
The Reader/Writer waits until the Tag has entered the antenna communication area and
executes the command it received from the host. The Reader/Writer prohibits access to the Tag
after the communication has been completed, and keeps the antenna oscillated to maintain the
FIFO access. Under such conditions, the Reader/Writer can issue another FIFO command and
communicate with the next Tag that entered the communication area where the previous Tag
with which the communication has been completed is still present. (The commands other than
FIFO Access are rejected).
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). To exit the FIFO state,
execute Stop Command (ST).
オートコマンド
タグ接近待ち
タグ接近待ち
交信処理
レスポンス
（上位機器）
（リーダライタ）
（タグ）
未接近
タグ
ビジー状態
ビジー状態
コマンド終了
未接近
通過
①リーダライタがコマンドを受信します。
②
R/W
アンテナの交信領域内にタグが入る
のを待ちます。
③タグが
R/W
アンテナの交信領域内に入る
とリーダライタはタグと交信を行います。
④交信が終了した後、リーダライタは上位機
器にレスポンスを返します。
Note:
Note, that in Auto mode, the communication path between the Reader/Writer and the host are busy until the Tag
is close to the area; the host cannot send the next command under such conditions.
FIFO 継続状態
FIFO access is maintained.
(1)The Reader/Writer receives a
command.
(2)The Reader/Writer waits for a Tag
to enter the Reader/Writer antenna
communication area.
(3)When the Tag enters the
Reader/Writer antenna communication
area, the Reader/Writer communicates
with the Tag.
(4)After the communication has been
completed, the Reader/Writer returns a
response to the host. FIFO access is
maintained.
(Host) (Reader/Writer)
(Tag)
Waits for a Tag to approach
Waits for a Tag to approach
Busy
Busy
Communication process
Response
Passes
Yet to
approach
Yet to
approach
Auto Command
Command ends.
Tag