Omron CJ1W-V680C11, User Manual

Page: 103 / 214

SECTION 5
Write P
rotection
SECTION 5
ID Sensor Unit Functions
101
RFID System
User's Manual
Write Protection
The write protection function is provided so that product model numbers and other important product
information stored in the RF Tags can be protected from being lost though careless write operations. We
recommend that write protection be set after important data has been written.
Either of two write protection methods can be used, the V680 method or the V600 method. The method can be changed by
setting DM m+2 (Write Protection Disable Setting). Normally use the V680 method. If a V600 system is replaced with the V680,
the V600 method can be used to enable using the current RF Tag memory map, eliminating the need to change system
programming.
Setting Write Protection Using the V680 Method
Write protection is set in four bytes of RF Tag addresses 0000 to 0003 (hex). The setting for the most
significant bit of address 0000 (hex) specifies whether or not write protection is enabled for the RF Tag.
Write Protection Setting Area in RF Tag Memory Map
• The most significant bit of address 0000 (hex) is the Write-protect Bit.
ON: Enable write protection
OFF: Disable write protection
• Write Protection Setting Ranges
Start address: 0000 to 7FFF hex
End address: 0000 to FFFF hex
If write protection is enabled, write separately to the write protection setting area (addresses 0000 to 0003 hex) and the rest of
the RF Tag (addresses 0004 hex and higher). If the MSB of address 0000 hex is ON and you write both the write protection
setting area (addresses 0000 to 0003 hex) and following addresses at the same time, a write protection error will occur.
If write protection is disabled, you can use the write protection setting area (addresses 0000 to 0003 hex) as normal user
memory. If you use the write protection setting area (addresses 0000 to 0003 hex) as normal user memory, be sure to disable
write protection in the ID Sensor Unit.
Address
(hex)
7 6 5 4 3 2 1 0
0000
Enable/
Disable
Bit
Upper two digits of start address (00 to 7F)
0001 Lower two digits of start address (00 to FF)
0002 Upper two digits of end address (00 to FF)
0003 Lower two digits of end address (00 to FF)