104
Sec
tion 6
RF
Ta
g
Co
mmunicat
ions
RFID System
User's Manual
(Modbus TCP)
Section 6
Functions
Once
Communications with the RF Tag are performed according to queries that are sent from the host
device.
When the Reader/Writer has completed communicating with the RF Tag, it sends a response to the
host device and then waits for another query.
If there is no RF Tag in the communications field when the Reader/Writer receives a query from the
host device, the Reader/Writer returns an RF Tag missing error (error code: 2001 hex). Use a sensor
or other means to confirm the presence of an RF Tag before sending the query.
Auto
The Reader/Writer automatically detects an RF Tag and communicates with it.
After the host device sends the query, the Reader/Writer automatically detects an RF Tag that enters
the communications field and communicates with it.
RF Tag
Reader/Writer
The Reader/Writer communicates with the RF Tag in the
communications field of the antenna when the host device
sends a query.
If there is no RF Tag, an RF Tag missing error will occur.
If an RF Tag communications error occurs, an error is
detected according to the nature of the error.
Host device
Reader/Writer
Host device
Reader/Writer
Reader/Writer
RF Tag
RF Tag operation
Once communication
Communications
processing
Response
RF Tag
Processing completed.
Reader/Writer
The Reader/Writer communicates with any RF Tag that
enters the communications field and returns the result to
the host device. Then the Reader/Writer waits for
another query.
RF Tag
Waiting for RF Tag
RF Tag
Host device
Reader/Writer
Host device
Reader/Writer
Reader/Writer
RF Tag
RF Tag operation
Processing completed.
Response
Auto communications
Communications
processing
