121
RFID System
User’s Manual
Section 4
Wr
it
e Prot
ect
ion Func
tion
Section 4
Functions
Write Protection Function
The write protection function prevents important data stored in the RF Tag, such as the product type and
model, from being overwritten by other data and lost. Use the following method to set write protection after
writing important data.
The write protection function can be enabled or disabled with the PARAMETER SET command (SP).
Setting Write Protection
The write protection function is set in the four bytes of addresses 0000 through 0003 (hex) of the RF
Tag's memory. The status of the most significant bit of address 0000 (hex) determines whether or not
the write protection function is enabled for individual RF Tags.
• Write-protection Bit (most significant bit of address 0000 (hex))
1: Data is write-protected
0: Data is not write-protected
• Write Protection Setting Area
Start address: 0000 to 7FFF(hex)
End address: 0000 to FFFF(hex)
Settings to Write-protect Addresses 0006 through 07FF (hex)
Settings to Not Write-protect Addresses
The DATA FILL command will write data even to areas of the Tag for which write protection has been set. Confirm that there is no
important data in the area being written before executing this command.
Address (hex)
Bit
7
6
5
4
3
2
1
0
0000
Yes/No
Upper two digits of start address
0001
Lower two digits of start address
0002
Upper two digits of end address
0003
Lower two digits of end address
Address (hex)
Bit
Upper digit
Lower digit
0000
1
0
0
0
0
0
0
0
8
0
0001
0
0
0
0
0
1
1
0
0
6
0002
0
0
0
0
0
1
1
1
0
7
0003
1
1
1
1
1
1
1
1
F
F
Address (hex)
Bit
Upper digit
Lower digit
0000
H
0
0
0
0
0
0
0
0
0
0
0001
H
0
0
0
0
0
1
1
0
0
6
0002
H
0
0
0
0
0
1
1
1
0
7
0003
H
1
1
1
1
1
1
1
1
F
F
