Omron V680 User Manual page 33

Write Protection Function
The write protection function prevents important data, such as product information, stored in memory in
a Tag from being inadvertently overwritten.
After important data has been written to memory, it can be write-protected using the following method.
The write protect function setting can be switched with switches 4 to 7 (Write Protect Function Setting) of the V680-
CA5D @@ -V2 Controller.
Setting the Write Protection Function
Write protection is set in Tag addresses 0000H to 0003H.
The setting for the most significant bit of address 0000H specifies whether or not write protection is enabled.
Address Bit 7
YES/
0000
H
NO
0001
H
0002
H
0003
H
• 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 to 7FFF
H
End address: 0000 to FFFF
H
Write Protection Setting Examples
• Settings to write-protect addresses 0008H through 03E7H:
Address Bit 7
1
0000
H
0
0001
H
0
0002
H
1
0003
H
• Settings to not write-protect any addresses:
Address Bit 7
0
0000
H
0
0001
H
0
0002
H
0
0003
H
The write protect function is a function of the V680-CA5D @@ -V2 Controller. This function is not supported by reader/
writer units of other brands.
6 5 4 3
Upper two digits of start address
Lower two digits of start address
Upper two digits of end address
Lower two digits of end address
H
H
6 5 4 3
0 0 0 0
8
0 0 0 1
0
0 0 0 0
0
1 1 0 0
E
6 5 4 3
0 0 0 0
0
0 0 0 0
0
0 0 0 0
0
0 0 0 0
0
Specifications and Performance
2 1 0
(00 to 7F)
(00to FF)
(00 to FF)
(00 to FF)
2 1 0
0 0 0
0
0 0 0
8
0 1 1
3
1 1 1
7
2 1 0
0 0 0
0
0 0 0
0
0 0 0
0
0 0 0
0
Section 2
RFID System
31
User's Manual