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RFID System
User's Manual
Section 3
V680 Commands
Section 3
Commands
OVERWRITE COUNT CONTROL (MD S/L)
The OVERWRITE COUNT CONTROL command is used to manage overwrite counts for EEPROM RF
Tags. The specified overwrite count control area data is updated to enable determining when the
EEPROM's write life has expired.
Note:
The write life for EEPROM RF Tags is 100,000 at 25
°
C.
For details on OVERWRITE COUNT CONTROL, refer to
Communications specifi-
cation
Specifies the method for communicating with the RF Tag.
For details on communications specifications, refer to
Communications with the RF Tag
.
Processing specification
Specifies the check process.
S: Subtraction (Overwrite control count can be set by user. 16,700,000 writes max.) See note.
L: Addition (Overwrite control count fixed at 100,000 writes.)
Fixed value
Always 1.
Area start address
Specifies the start address of the overwrite count control area in 4-digit hexadecimal.
Setting range: 0000 to FFFD hex
Decrement count
Specifies the number of refresh operations in 2-digit hexadecimal.
Setting range: 00 to FF hex (00
Performs overwrite count check only.)
For details, refer to
End code
Indicates the execution result for the command.
The end code 00 indicates normal completion.
For details on end codes, refer to
.
Fixed value
Always 1.
Resend flag
Always 0.
Command
M
D
1
2
2
C R
S / L
×
×
2
×
×
2
1
1
×
×
×
×
4
Command
code
Fixed
value
Terminator
Communica-
tions
specification
Area start address
Decrement
count
Pro-
cessing
specifi-
cation
Response
M
D
0
2
2
C R
1
0
0
2
1
1
Command
code
Fixed
value
Terminator
Resend
flag
End code