V02.00 | 2020/08
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9.8
Using NEXT mode
NEXT mode can only be used in HF single-tag applications. An HF tag is always only read,
written or protected if the UID is different to the UID of the last read or written tag.
9.8.1
Example: Using NEXT mode for a Read command
ü
Requirement: Tag A and tag B must have a different UID.
Set Read command in the process output data.
Set NEXT mode: Enter the value -1 in the process output data at
Length UID/EPC
.
Tag A is located in the detection range of the read/write head. The controller sends a Read
command in NEXT mode to the RFID interface.
The Read command is transferred from the interface to the read/write head. The read/write
head reads the data of tag A once.
The controller sends a second Read command in NEXT mode to the RFID interface. The Read
command is not transferred from the interface to the read/write head as long as tag A is in the
detection range of the read/write head.
The Read command is transferred from the interface to the read/write head if tag B is in the
detection range of the read/write head. The read/write head reads the data of tag B.
Read (next tag)
Data
Read
Data
Read
Data
Read (next tag)
Data
Read
Data
Read
Data
Tag A
Tag A
Tag B
PLC
TBEN
RW-head
Tags
Fig. 108: NEXT mode (layout)