Write Protection - Omron V680-HAM91 User Manual

Section 3
Functions

Write Protection

The write protection function protects important data stored in the memory of a RF Tag, such as the product
model or type, from being overwritten inadvertently.
Enable the write protection function after writing important data as described in this section.
Setting Write Protection
For the write protection function to be effective, it must be enabled in both the ID Flag Sensor settings
and the RF Tag settings.
Write protect enable/disable settings is effective only TRIGGER MODE 1 and AUTO MODE 1.
Write protect is always enabled at the TRIGGER MODE 2 and AUTO MODE 2.
The method of write protect for TRIGGER MODE 2 and AUTO MODE 2 confirms to the V600 series.
Details of Write Protect function for V600-compatible Mode, refer to the Section 7 Appendices
1.
Enabling the Write Protection in the ID Flag Sensor
Write protection can be enabled by turning OFF pin 6 (NOISE_IN/WRITE PROTECT) of I/O connector CN2.
NOISE_IN/WRITE PROTECT input is effective as WRITE PROTECT input only when it specified write mode(R/W : ON).
2.
Setting Write Protection for RF Tags
Write protection is set in the 4 bytes from RF Tag addresses 0000 hex to 0003 hex. Write protection for RF Tags is enabled in the
most significant bit of address 0000 hex.
• Write-protect Bit (most significant bit of address 0000 hex)
1: Write-protected (write protection enable)
0: Not write-protected (write protection disable)
Memory Map for RF Tag Write Protection Settings
Address
0000 hex
0001 hex
0002 hex
0003 hex
When write protection is not used, the above addresses can be used as user memory. If it is used as user memory,
disable the write protection function of the ID Flag Sensor by turning ON pin 6 (NOISE_IN/WRITE PROTECT) of I/O
connector CN2. NOISE_IN/WRITE PROTECT input must be OFF when reading the RF Tag. If it turns ON during
reading operation, the ID Flag Sensor execute Noise level measurement.
• Addresses in RF Tag Memory That Can Be Write Protected
Start address: 0000 hex to 7FFF hex
End address: 0000 hex to FFFF hex
The write-protection setting area of the RF Tag cannot be write-protected.
RFID System
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User's Manual
p.184
Bit 7 6 5 4
Enable/
Upper two digits of start address (00 to 7F)
disable
Lower two digits of start address (00 to FF)
Upper two digits of end address (00 to FF)
Lower two digits of end address (00 to FF)
3 2 1 0