Omron V600 Series User Manual page 66

Section 4
Function
Data Carriers without Batteries
■ Setting Write Protection Function
The write protect function is set by writing the final address to be protected in address 0000H of the Data
Carrier's memory. The area between address 0001H and the write-protect end address will be write-
protected.
The status of the most significant bit of address 0000H determines whether or not the write protect
function is in effect.
Address
0000
• Write-protect Bit (most significant bit of address 0000H)
1: Write-protected (Yes)
0: Not write-protected (No)
• End Address Setting Range
00H, 01H to 7FH
Addresses 0080H to 00FFH cannot be set as the end address. If the end address is set to 00H, however,
all addresses from 0001H to 00FFH will be protected.
When using the write protect function, write the data in two operations, i.e., one for the write-protected area (address
0000H) of the ID Tag, and one for outside the write-protected area (address 0001H or higher). When the most signifi-
cant bit of address 0000H is 1 and data is written that exceeds the write-protected area (address 0000H) of the ID Tag,
a write protect error will occur.
■ Write-protect Setting Examples (254-byte Memory Data Carrier)
(1)The following settings would write-protect addresses
0001H through 0012H:
Address
0000
H
(2)The entire memory except address 0000H is write protected by
setting the end address to 00H, as shown below.
(Example: When the end address is 00H)
Address
0000
H
■
Canceling Write Protection
To cancel write protection, set the most significant bit of address 0000H to 0. The write protection will be
cancelled, and the address set in 0000H will be ignored.
Address 0000H is the write protection setting area.
Therefore, always structure the data so that any data that needs to be write protected is written in addresses starting
from 0001H.
RFID System
64
Operation Manual
Bit 7 6 5
Yes/No
Bit 7 6 5 4 3 2
1 0 0 1 0 0
9 2
Bit 7 6 5 4 3 2
1 0 0 0 0 0
8 0
(V600-D23P@@)
4 3 2 1
End address
1 0
1 0
1 0
0 0
0
Address
0000
0001
Write-protected
area
0012
00FD
Address
0000
0001
Write-protected
area
00FD