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RFID System
User’s Manual
SECTION 5
V680 Commands
SECTION 5
Communications
OVERWRITE COUNT CONTROL (MD S/L)
The OVERWRITE COUNT CONTROL command is used to manage overwrite counts for EEPROM
Tags. The specified overwrite count control area data is updated to enable determining when the
EEPROM's write life has expired.
1:1 Protocol
Note: The write life for EEPROM Tags is 300,000 writes at 40°C.
Note: When using the multi-access trigger communications designation (MT), the ID controller returns
an end code of 03 after communicating with all Tags.
Communications
designation
Specifies the method of communications with the Tag.
Refer to Communications Designation Function for details on the communications designation.
p. 103
Mode designation 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.)
Antenna designation Specifies the Antenna with which to communicate.
“1”: Antenna 1
“2”: Antenna 2
UID A unique identifier used to identify Tags.
Added only for the selective communications designation (SL).
Area start address Specifies the start address of the overwrite count control area in 4-digit hexadecimal.
Setting range: 0000
H to FFFDH
Decrement count Specifies the number of refresh operations in 2-digit hexadecimal.
Setting range: 00
H to FFH (00H: Performs overwrite count check only.)
Refer to Tag Service Life Check for details.
p. 91
End code Indicates the execution result for the command.
00: Normal end
76: Data error warning
Refer to List of End Codes for information on other end codes.
p. 171
UID A unique identifier used to identify Tags.
Added only for multi-access communications designations (MT/MR).
Command
code
Mode
desig-
nation
Terminator
Area start address
Decrement
count
Antenna designation
Communi-
cations
designation
××
MD
××
S/L 1/2
××
211 4
2
* CR
2
××
2
××
UID
××
0 or 16
...
Command
Response
Command
code
Terminator
End code
Antenna
desig-
nation
Resend flag
MD
××
22
2
* CR
0×
11
××
UID
××
0 or 16
...
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