User Manual

41
RFID System
User's Manual
Section 2 Tags
Section 2
Specifications and Performance
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 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.
 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.
• 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 7FFFH
End address: 0000H to FFFFH
 Write Protection Setting Examples
• Settings to write-protect addresses 0008H through 03E7H:
• Settings to not write-protect any addresses:
The write protection function is a function of the V680-CA5D@@-V@ Controller and the C@1W-V680C@@ ID Sensor
Unit. It is not supported by reader/writer units from other manufacturers.
Address Bit 7 6 5 4 3 2 1 0
0000
H
YES/
NO
Upper two digits of start address (00H to 7FH)
0001
H Lower two digits of start address (00H to FFH)
0002
H Upper two digits of end address (00H to FFH)
0003
H Lower two digits of end address (00H to FFH)
Address Bit 7 6 5 4 3 2 1 0
0000
H
10000000
80
0001
H
00001000
08
0002
H
00000011
03
0003
H
11100111
E7
Address Bit 7 6 5 4 3 2 1 0
0000
H
00000000
00
0001
H
00000000
00
0002
H
00000000
00
0003
H
00000000
00