Operation
RFID commands – flow charts
28
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Tag
present?
Tag = true
Tag = false
TAG LED
off
TAG LED
on
New RFID WRITE CMD
is sent every time start
bit is toggled.
Yes
No
BUSY LED
flashing
(1 Hz)
No
New RFID data
available?
Device = RDY
Device <> RDY
BUSY LED
flashing
(1 Hz)
BUSY LED
off
Device is busy.
Error?
ERR = false
ERR = true
ERROR
LED on
RFID error:
see error code
list
ERROR
LED off
RFID data
written
successfully.
More
RFID data to
write?
5
NB BLOCK: write
ADD: write
RFID data: write
1
5
Yes
Inventory
Tag detected
CMD = 4*
(Write)
Start
bit toggled
by user?
0
g
1
1
g
0
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. 15: Write