5-2
Section
Communications Sequences
65
5-2-3 Single Repeat, FIFO Repeat, and Multi-repeat Modes
In these repeat modes, when the Controller receives a command from the host,
the Controller waits for the arrival of an ID Tag. Each time that an ID Tag passes
within communications range, the Controller communicates with the ID Tag and
returns a response to the host. As long as the Controller is in one of these repeat
modes, it will be in the “command processing” state and cannot receive com-
mands other than the STOP or RESET commands. The Controller must be
switched to the “ready” state by sending the STOP or RESET command in order
to accept other commands.
Host
REPEAT
command
Response
received
Response
received
Controller
(Waiting for ID Tag)
Communications
data processing
Response
Communications
data processing
Tag
Not in range
Not in range
Tag (1)
Passed
Tag (2)
Not in range
(Waiting for response)
(Waiting for response)
(Waiting for response)
(Waiting for ID Tag)
Response
Not in range
(Waiting for ID Tag)
(Waiting for ID Tag)
(Waiting for ID Tag)
Passed
(Waiting for ID Tag)
1, 2, 3...
1. The host sends the REPEAT command.
2. The Controller does not return a response until the ID Tag is in range.
3. When the ID Tag passes through the communications area of the Antenna,
the Controller communicates with ID Tag according to the command.
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