67
RFID System
Operation Manual
Sec
tion 4
Da
ta
Car
rie
r Serv
ic
e Li
fe
Det
ec
ti
o
n
Section 4
Function
■
MDL Command
The overwrite count control area consists of 3 bytes
from the start address. The incremented value of the
overwrite count is written in this area, and if this value
is 100,000 (0186A0H) an end code of 76 will be
returned as a warning.
The number of overwrites is controlled using hexadeci-
mal values.
The current value can be read using the READ com-
mand.
If the control area data is already 100,000, the control
area value will not be refreshed, and only a warning will
be returned as a response.
When the refresh count is set as 00H, the count will not be updated, and only an overwrite count check
will be performed.
Set the start address to between
@@@
0H and
@@@
5H or between
@@@
8H and
@@@
DH. If the start address is set
between
@@@
6H and
@@@
7H or between
@@@
EH and
@@@
FH, an address error (error code: 7A hexadecimal) will
be returned as the end code.
For details on command format, refer to
MANAGEMENT DATA SUBTRACTION/LIMIT (MDS/MDL)
.
■
Application Example for MANAGEMENT DATA LIMIT (MDL)
Using the Three Bytes from Address 0010H as the Overwrite Count Area
Do not use both the MDS and MDL commands for the same Data Carrier. Doing so will prevent overwrite management.
Overwrite Life of Data Carriers without Batteries
Number of overwrites with an ambient temperature between the minimum temperature and 70
C: 100,000
Number of overwrites with an ambient temperature between the minimum temperature and +40
C: 300,000
1. The overwrite count area is cleared.
“WTH10010000000” is executed.
2. Enter an overwrite count of 4. “MDL1001004”
3. Enter an overwrite count of 5. “MDL1001005”
The value will be added, making the count 9.
4. The accumulated count is 100,000 times.
When “MDL1001000” is executed, the
“MD76” will be returned (overwrite count
exceeded).
3 bytes
Area start address
Upper di
g
it
Middle di
g
it
Lower di
g
it
0010
0011
0012
00
H
00
H
00
H
0010
0011
0012
00
H
04
H
00
H
0010
0011
0012
00
H
09
H
00
H
0010
0011
0012
A0
H
01
H
86
H
Summary of Contents for V600 Series
Page 50: ...48 Section 2 Wiring RFID System Operation Manual Section 2 Installation and Wiring MEMO ...
Page 72: ...70 Section 4 Write Command Memory RFID System Operation Manual Section 4 Function ...
Page 138: ...136 Section 5 End Codes RFID System Operation Manual Section 5 Communications MEMO ...