43
RFID System
User's Manual
Sect
RF Ta
gs
Specifications and Performance
Write Protection Function
The write protection function prevents important data, such as product information, stored in memory
in a RF Tag from being inadvertently overwritten.
After important data has been written to memory, it can be write-protected using the following method.
The write protection function can be switched with SW4-7 (Write Protection Function Setting) of the V680-CA5D
@@
-V
@
Controller or with word (Write Protection Function Setting) in the DM(m+2)CH Area words allocated to the C
@
1W-
V680C
@@
ID Sensor Unit.
Refer to the V680 Series User’s Manual (Cat. No. Z249) for details.
Setting the Write Protection Function
Write protection is set in RF Tag addresses 0000H to 0003H.
The setting for the most significant bit of address 0000H specifies whether or not write protection is enabled.
• Write-protect Bit (Most significant bit of address 0000H)
1: Write-protected (Yes)
0: Not write-protected (No)
• Write Protection Setting Area
Start address: 0000
H
to 7FFF
H
End address: 0000
H
to FFFF
H
Address
Bit
7
6
5
4
3
2
1
0
0000
H
YES/
NO
Upper two digits of start address
(00
H
to 7F
H
)
0001
H
Lower two digits of start address
(00
H
to FF
H
)
0002
H
Upper two digits of end address
(00
H
to FF
H
)
0003
H
Lower two digits of end address
(00
H
to FF
H
)