User`s manual

57
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 ID
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 ID Tags is 100,000 at 25°C.
For details on OVERWRITE COUNT CONTROL, refer to ID Tag Service Life Detection.
p.109
Communications specifi-
cation
Specifies the method for communicating with the ID Tag.
For details on communications specifications, refer to Communications with the ID Tag.
p.47
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 ID Tag Service Life Detection.
p.109
End code Indicates the execution result for the command.
The end code 00 indicates normal completion.
For details on end codes, refer to End Codes.
p.69
Fixed value Always 1.
Resend flag Always 0.
Command
MD
1
2
2
CR
S/L
××
2
××
2
11
××××
4
Command
code
Fixed
value
Terminator
Communica-
tions
specification
Area start address
Decrement
count
Pro-
cessing
specifi-
cation
Response
MD
0
2
2
CR
1
00
2
11
Command
code
Fixed
value
Terminator
Resend
flag
End code