Operation
RFID commands – flow charts
26
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NB BLOCK: read
ADD: read
Tag
present?
Tag = true
Tag = false
TAG LED
off
TAG LED
on
New RFID READ CMD
is sent every time start
bit is toggled.
Yes
No
READ command
parameters are set.
As soon as a tag is
detected, the RFID
read command will
be send.
BUSY LED
flashing
(1 Hz)
Start
bit toggled
by user?
0
g
1
1
g
0
No
Yes
BUSY LED
flashing
(1 Hz)
1
New RFID data
available?
Device = RDY
Device <> RDY
BUSY LED
flashing
(1 Hz)
BUSY LED
off
Device is busy.
New data can be
read out in PDI
Byte 4…31.
Error?
ERR = false
ERR = true
ERROR
LED on
RFID error:
see error code
list
ERROR
LED off
RFID data read
successfully.
More
RFID data to
read?
4
4
Inventory
Tag detected
CMD = 3*
(Read)
Start
bit toggled
by user?
0
g
1
1
g
0
Power off
(IO-Link)
Yes
No
*The edge of the ready bit behaves
equivalently to the start bit.
Fig. 14: Read
